Showing posts with label Guitar Amplifier. Show all posts
Showing posts with label Guitar Amplifier. Show all posts

4/13/2014

Guitar Circuit with built-in speaker

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The idea to make a guitar with a built-in speaker came when I stumbled upon a fact that if I miss a pulse through the speaker, it will be heard far away.

Recall manual siren. Human hand, twisting it develops 0.1 horsepower, this is where it is 100 watts (RMS), and heard it on the entire city.Flashlight compared with 1500 Watt PMPO 1000W RMS projector brightness turned this flashlight shines brighter and more, even though there was a light bulb 5 watts RMS. Similarly, energy saving light bulbs, written on them two 100 watts and 8 watts. But this retreat. Also on imported musical instrument in writing all power PMPO.

So, if the distortion of the sound spectrum converted to a pulse with a large buildup of small capacitors and alleviate sinus large capacitors, then turn out so when mixed. Promoduliruyutsya under sinusoidal pulses, acquiring the height of its envelope. Pulses will hear anything away, because of their large growth. But due to the fact that they will have different heights under sinus, they will be perceived by the human ear differently, carrying information about the full spectrum of sound. 
This transformation into pulses and sine and mixing occurs on a chip amplifier effective D2 (the chip I can not seem to pick up for this part, so did its own microassembly until painted, because it developed). Coefficient PMPO this chip gives the coefficient 300. That is, when consumption of battery power amplifier crown 0.8 watts (RMS) guitar gives out 240 Watts PMPO volume.

Scheme guitar with built-in speaker:


It is known that it is necessary for restaurants 100 watts to 300 watts shift halls (power amplifier goes 1 Watt RMS) for concert 1000 watt (power amplifier here goes 3.3 watts RMS). Coefficient PMPO 300 guitar can do it.

This part of the effective amplifier with limiting diodes D2 purely mine. The first part of the effective amplifier, tone and preamp made by conventional schemes. Power Amplifier taken from Marshall amp already built up a guitar at a frequency of 50 to 13,500 Hz. Did not want to reinvent the wheel. 
The third chip preamplifier (preamp), stands for alignment voltage DC tone, if it comes to it a little, as well as for the formation of overdrive. If humps AFC voices raised high, they begin to be limited, there is an increase in their growth, rather than amplitude. Intermediate frequencies are soft, not isolated and then there is no loss spectrum and volume control on the ear remains.

D2 tuned to the frequency 1700 - 2200 Hz and generates downs 100 to 3500-4500 Hz. Input from 2 to 5 millivolts it does not distort.

Frequency obstructions on different chains, plus a capacitor input impedance or resistance, etc. I want to calculate, but a book with formulas passed back to the Institute, it is necessary to take it again. While doing the ear, with observations from other circuits and devices.Infringement at low frequencies not, because it is necessary for the effects of sound from 100 Hz, body volume allows guitars to make them. 
The sound of this scheme, because such characteristics can be confused with the sound of bands such as Disi Asay, Metallica, Gaunz Roses, Kiss, Bon Jovi. It all depends on the setting of D2, and can be customized to fit our music. It adjusts for distoshn, drive, metal, electrical, acoustic, mixed. Channels are made entirely only without amplifier and the first part of the amplifier efficiently. In the diagram this channel is highlighted with a blue border.

That makes guitars with a slightly shorter scale length with pegs on the other side, that would have been smaller sizes. I think the small size would blend well with a large capacity. 


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Guitar Amplifier circuit

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Pedal ("lotion», stomp-box) is designed to simulate the sound of a tube amp channels slaboperegruzhennogo Fender Twin Reverb and implementation effects «Clean» and «Crunch». A distinctive feature of this pedal is very plausible imitation tube sound, and low power consumption of the battery. («Clean» - sound with virtually no distortion, but with the corrected tone, usually bright, with a predominance of high frequencies. «Crunch» - sound on the verge of distortion and with a little overdrive). The article is intended not only for professionals, musicians, but also for beginners because some terms and concepts considered overly detailed, pro please treat this with understanding ...
A little history

In contemporary music, electric guitar takes about the same place as in the classical violin. Some styles of rock without electric possible at all ... For all that is in itself an electric guitar - an instrument with a rather weak capacity (to see this - turn it directly into a mixing console). That's because electric sound is largely determined by the amplifier, or "gadgets" / preamp, in which it is included. Moreover, unlike the art audiophile distortion guitar sound play a key role. Traditionally considered the best sounding tube guitar amplifiers. In addition, there are both subjective and objective reasons - firstly, this sound familiar to most - because electric guitar was born at a time when other amps just was not in the second - that tube amplifiers have several very valued musicians properties rarely encountered in semiconductor chips: first of all the dynamics and readability. List the advantages of tube amplifiers can continue, but I have identified, in my opinion, the main thing.

Strictly speaking - "Lamp" is neither a guarantee of good sound (meet and lamp units with a hideous sound), nor the only possible way it was received. After all, despite all the advantages, disadvantages in lamp technology is also missing - this fragility lamps, and high cost, and weight / size. That is why since the advent of transistors, and later - chips, and large firms, and some enthusiasts do not stop trying to recreate the sound of a tube on the semiconductor elements. While it is still too early to say that this problem is solved completely and finally, I know some very striking examples of successful solutions, and single enthusiasts often ahead of even large companies - manufacturers of guitar equipment.

On receipt of the effect of "distortion" written hundreds of articles, there are thousands of schemes. But the sound, uncluttered, and weakly podgruzhenny amplifier is often overlooked, especially budding guitarists. But fate does not end with "metal", and it, darling, too, "wedge" will not spoil ... Another reason for the small number of such schemes - the relative difficulty of getting the right sound. It turns out - strong overdrive with a decent sound easier to obtain than a light bluesy crunch ... It is in the small-Heine particularly noticeable difference between the vacuum tube and semiconductor devices - light enters the restriction very smoothly, asymmetric, because the beginning of distortion and time-limited out of it almost unnoticeable. In addition - due to the nature Lamp restrictions - limited range of higher harmonics of the signal is poor, the sound does not cut the ear even on chords and excellent dynamics and allows to play loud and quiet, and to allocate the necessary notes and volume and tone ... The majority of the semiconductor pedal has a rather sharp threshold limit (usually done by limiting diodes or LEDs), causing distortions are very sharply above this threshold, and disappear when the attenuation of the signal below it, on hearing less pleasant than a smooth threshold lamp ... Dynamics semiconductor pedals usually much worse tube, after exceeding the threshold limits the tone and volume depend little on the tone and volume of the signal from the guitar. That in tube circuits obtained by "self-other" should be achieved in semiconductor artificial and often quite clever ways.

Among the classic tube amps kind of standard "wedge" is a Fender Twin Reverb, in fact, this scheme then used repeatedly in different amplifiers Fender, and in amplifiers and preamps other firms. Offered to your attention the scheme - one of the attempts to reproduce the sound of the legendary amplifier based on a semiconductor ...
Scheme pedal

Block diagram of the device copies the prototype: the sound is two cascades tembroblok in between. The resemblance to the prototype and ends ...


In the prototype, the first stage is built on the vacuum triode 12AX7 and has a gain (CG) of about 50. With a supply voltage of about 300V and cascade input signal levels, typical for electric guitar, the output stage is not limited to "focus" in the food.

The proposed device is powered by a 9V Crowns, same scale input voltage circuit may reach 4-5 V, depending on the type of guitar pickups and aggressiveness artist ... Because in the proposed scheme, the first stage is built repeater that provides normal operation with real signals. Repeater functions as a high output impedance matching guitar and relatively low input impedance TONE. With this input impedance corresponds to the standard pedal for guitar amps 1 Mohm.

Operational amplifier as a repeater chosen for several reasons: although this node could be done and FET real benefits such a decision would not bring. The fact that, although the FET and has a low noise level, the transmission coefficient of such a cascade is about 0.7-0.8 (1 for the OS), and it has more circuit parts, and most importantly - the relatively small gain of the second stage either it does not reveal the advantages of the cascade on Fri Also - in the applied chip TL072 includes two OS that makes use of one of the op-amp follower and economically justified, especially as the typical current consumption TL072 does not exceed 4 mA. But replacement by "next of kin» TL062 is not recommended - even though it consumes 10 times less noise properties it no longer satisfy the requirements of this scheme - in all its noise Heine appears noticeably audible hiss-...

Tone-in scheme similar to Fender pedal used, although it has a couple of differences - component values ​​are translated into downward resistance, as the signal swing is many times smaller than the prototype, and depth adjustment in each frequency band markedly increased (best ratings were picked up using in circuit simulation program simulator Micro-Cap 8 followed by thorough otslushivaniem and comparison with the prototype).

To reduce the audible noise level scheme, the controller gain is not worth after TONE, as in the prototype - and adjusts the gain of the second stage. Stock adjustment allows you to get sound from the wedge to the midgeyna (using guitars with pickups hambakernymi). The second feature of this switching regulator gain is that by increasing the gain changes the frequency response of the cascade - through capacitor C10 at high gains trimmed excess for this mode high frequency components from the input circuit.

Gain of the second stage at the minimum gain is about 11 - it is done to compensate for signal attenuation TONE. Amplification of the stage at the maximum gain - about 110.'s Not very much, but enough to simulate load the V channel. Further increase gain no special meaning - the sound becomes less "tube" and loses the similarity to the prototype.

Actually, imitation Lamp restrictions combination gives TL072 op-amp with MOSFET transistor 2n7002. It therefore should not be changed to another type TL072 op-amp - not all types are suitable for the proper operation of this scheme. Diode VD3 does not allow internal reverse diode transistor VT1 open at negative half-wave output voltage.

That's roughly the shape looks a limited output voltage DA1.2 sinusoidal input signal (shape depends on the signal frequency and the position gain and tone controls).



In its form, this waveform is very similar to the waveform of the tube stage, an inverted "upside down", here at the anode lamp waveform 12AX7:



Inclination of the upper shelves at DA1.2 limitations due to the fact that at the moment of the waveform capacitance C9 in the layout was par value of 0.1 microfarads, increasing it to 1 uF slope almost leveled. Actually slabogeynovy instrument was born almost by accident - "research" conducted for the production emulator haygeynovogo "red" channel amplifier Mesa Boogie Dual Rectifier. During the simulation form limited signal seemed strangely familiar and it was decided to use the stage for peaceful purposes slabogeynovyh ... It is because in the first layout was 0.1 microfarads capacitance - this heritage haygeynovoy scheme ...

Clearly that rounding signal at the start of limitations - rather smooth, which provides a relatively low level of higher harmonics. And with an increase in the amplitude of the input signal is a smooth rounding first upper half wave, then a more stringent limit bottom - the distortion increases smoothly as in the tube stage.

The second positive feature ligament TL072 op-amp with MOSFET transistor 2n7002 - this asymmetry restrictions. As in the case of the lamp first starts to confine one halfwave of the output signal (the lamp - the bottom, we have - the upper, which is absolutely essential, since the phase rotation of 180 degrees occurs repeatedly in the subsequent amplification). The shape restrictions caused MOSFET'a properties that limit makes smoother than the diode. Then comes into play OS limitation on Nutrition (namely TL072, namely on the lower half-wave in this scheme gives a form of restriction attempts to make it otherwise lead to a much more acute angles at the entrance to the limit and noticeably worse sound). While still a shift output DC - similar tube stage that slightly changes the duty cycle of the output signal and a very positive effect on the dynamics of sound.

Tumbler «Bright» works like prototype - adds to the sound of "glass" when necessary. Capacitor C12 slightly softens tone output. In the case of voiced amplifiers to increase its worth, in the case of impaired hearing sound - remove.

Capacitor C7 together with button-effect switch is used to "kill" circuit emulator when the bypass - in izbezhanie penetration interference with the signal output of the circuit in bypass.

Bypass this pedal is a passive type, one of the varieties of true-bypass - the so-called split-bypass when the signal is not disconnected from the input circuit. That is why when the bypass is desirable "turn off" (from the word mute mute) the signal flow through the restrictor - otherwise possible penetration of harmonics limited output signal that is heard as unpleasant podzuzhivanie. Passive bypass this pedal is fully justified - because of low marginal gain pedal is not prone to self, and in co-operation with passive devices haygeynovymi bypass has lower noise and simplifies the pedal. If desired, it is easy to make active - follower DA1.1 in the scheme already, just add a capacitor and its output resistor to ground to eliminate clicks. Alternatively, the yield after nondisconnectable repeater can be used to connect the tuner (if the optional output jack, naturally) ...

Food scheme is carried out either by batteries "Crown" or an external power supply 9-12V via a standard connector block desirable stabilized.For reverse polarity protection diodes are VD4, VD5, through which automatically connects the power supply with a higher voltage, and if disconnected the power supply will automatically connect battery. Capacitor C11 eliminates the possible self-excitation circuit and increases battery life. It is possible to use only one diode, and switching power supply battery and carry in the power connector - most serial connector has an additional contact for the battery. Naturally - with this method when the battery is disconnected the power supply on the stage does not automatically connect, and more - will probably need to isolate the power connector from the body, it is not easy, if it is attached to the nut housing. Resistors R2, R3 and capacitor C2 create point "artificial ground" for normal OS from a single supply.

Warning: To Timer battery when unplugging from the input jack, negative cable from the battery is attached not to the ground (GND), and to the middle pin (ring) 
Connector Input. With the inclusion of a mono jack guitar cord this pin is shorted to ground and connect the battery.
Design and printed circuit boards

Many possible design options - it all depends on the imagination of the designer and opportunities. In the author's version dvuhplatnoy design - built on the same board tembroblok, on the other - all the rest, except the connectors and switches. At the same board soldered to the potentiometers, bolted to the body, and, thanks to its light weight, do not require additional bracing. Thus, the potentiometers are arranged in two rows, and perpendicular to the board and the housing cover parallel to each other. The disadvantage of this design - the need to connect the board to each other, as well as jacks and switches mounting wires. Same dignity - compactness and pedal boards in general. 
Points on the boards designated by single letters, interconnected (same points, of course) mounting wires. These same letters mark corresponding points on the concept.

The proposed fees are designed for installation of SMD components - this chip, transistors, diodes and resistors majority. An exception is made for capacitors "the pass" by the sound - there is recommended to use film capacitors, as the most suitable. It is not "snobbery tube", and the result is real auditions and measurements - Ceramic Capacitors noticeably louder, however, it becomes especially noticeable when lamp supply voltages and sweep signal in the circuit, because in the absence of the film can be at your own risk and put the ceramics, the more that the scheme itself and voiced slabogeynovaya.

In the absence of skill work with SMD quite possibly reroute fee under the usual details - though at the same time and will significantly increase its size, and the manual manufacturing (LUT) will repeatedly increase work drilling holes. Alternatively, the circuit can be assembled on a breadboard, completing installation scraps conclusions elements and isolated postings.

As the "main" button for effect On / Off switch used standard DP2T. 
As a body in the author's version used aluminum body Pro'sKit 203-125B. 
Perklyuchatel Bright - mikrotumbler 2 positions. Resistor R15 is soldered directly to his conclusions. 
LED display - ultra-bright 3 mm, color - to taste. Ultrabright LED current can reduce it to about 0.5 mA with sufficient brightness, which prolongs battery life. If applied LED with clear lens, its worth zamatirovat fine sandpaper-nulevkoy.

Making your body can be very different - from polishing body engraved with inscriptions, and to panel fabrication method METALLOGRAFIKA. 
In the author's version of the hull was painted with powder paint and lettering are made in the form of stickers on transparency film (booked in an advertising firm) - this method is well suited for small-scale or production unit.

Here is the finished device in the author's version:


Recommendations for use

Most standard will be the inclusion of pedal effects chain after device with an active bypass (such a device, it is desirable to have the first after the guitar in the effects chain, usually overdrive effect - "drive"). Pedal is designed for use in conjunction with guitar amps (and speakers, cabinets!), Therefore, has no filter comprising spikosimulyatora (device that simulates the frequency response guitar cabinet). This means that when you turn into a regular household power or mixing console for more gain sound can be frustrating, "sand." With this inclusion should not add a lot of gain and include mode «Bright». It is also possible to include the pedal before the main "drive" - ​​when this pedal can be used not only as a generator pedalborda channel, but also as a "warmer" for the main "drive".

Nourish pedal comprising pedalborda better from the power supply - usually this block is common to several effects. Current consumption pedal is about 4 mA, so it is without any complications and unintended consequences can be connected to an existing block (recommended stabilized power - or more gain on possible overtones and background). If it is possible - better to increase the supply voltage to 12V - with little noise and improved dynamic properties of the pedal. If the pedal is used separately - powered by Kroon is justified because of fresh alkaline batteries when the 5 hours a day with a pedal operated for approximately six months. Low battery indication is the dim glow of the LED for effect and degrade sound.
Glossary (dictionary of specific terms and slang)

" Wedge »(« ​​Clean ») - sound" clean "guitar (not to be confused with the bypass), with virtually no distortion, but with the corrected tone, usually bright, with a predominance of high frequencies.

" Crunch »(« Crunch ») - the sound to the point of distortion and overdrive with a small, typical for blues, rock and roll, hard rock, and some styles of" metal ". Very expressive, and allows execution bust chords.

" bells and whistles "- common slang name among guitarists effects pedals for guitar. Typically connected at the entrance of the guitar amplifier.

" Preamp "- guitar preamp, as a rule - 2 or 3 channel, usually not connected into the input of the guitar amplifier, and« Return »loop externalities - ie directly to the power amplifier.

" Dynamics "- property pedal / preamp allocate note played more vigorously from weaker music, sound volume and timbre. In the case of devices with more gain - it's not as easy as it seems at first glance, because they have the property to align the volume of notes by limiting (and "extend" their duration).

" Readability "- property pedal / preamp do not" mess "sound when playing chords. Each note in the chord should be heard and not interfere with the rest. This gives the intelligibility of the sound at different riffs primarily and significantly improves the readability of the guitar in the mix.

" Gein »(« Gain ») - the ratio of the gain of the device to the threshold limit. More generally - the power amp overdrive.

" Haygeyn »(« Highgain ») - a kind of amps / preamps with an extended range of adjustment in the direction of maximum gain. Widely used in modern heavy music styles. Usually haygeynovye devices "incarcerated" under it more gain and small Heine sound unclear what causes such devices do multichannel - crunch channel usually contains less stages and has a different frequency response.

" Midgeyn »(« Midgain ») - a kind of amps / preamps with an average gain control range. Sound - from the wedge / crunch to sredneperegruzhennogo, typical for old-school rock, although widely used today.

" Bright "- underline mode for the treble range of electric guitars, adds brightness and sonority in the sound.

" Bypass »(« bypass ») - mode" bypass ", ie direct signal flow through the device without treatment.

" True-Bypass "- in terms of technology - passive bypass for mechanical contacts, without the use of electronic keys and active elements.From the perspective of some of the musicians - the only right kind of bypass ....

" humbucker »(« Humbacker ») - the type of pickup with two coils on a common magnetic system characterized by low sensitivity to interference and powerful output.

" Sand "- the high-frequency overtone flowing in the sound distorting pedals. When using the guitar speakers largely filtered out by the speaker.

" Drive »(« ​​Overdrive ») - channel preamp or lotion used to produce sound overdriven amplifier. Sometimes referred to as a soft overdrive overdrive, distortion - hard, but in fact - is the same thing ....

" Warmer "- pedal included between the guitar and amplifier / lotion / preamp for" heating "- increase the overall gain and changes in timbre.Typically uses a variety of boosters and overdrive with not much more gain.

" Spikosimulyator "- a device to simulate the sound through a guitar speaker / cabinet. Typically configured as a separate lotion, is sometimes included in the distorting preamps / lotions. Is a special filter, which roughly corresponds to the AFC AFC guitar cabinet.

" Cabinet "- guitar speaker, often on 4 speakers 12".

" AFC "- frequency response.

Original article sourse cxem.net
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3/30/2014

Guitar treble boost

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Description

Ql is connected as an emitter follower in order to present a high input impedance to the guitar. C2, being a relatively low capacitance, cuts out most of the bass, and C3 with RV1 acts as a simple tone control to cut the treble, and hence the amount of treble boost can be altered.Q2 is a simple preamp to recover signal losses in C2, C3, and RV1.

Circuit Diagram


Guitar treble boost   

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Guitar Effect Circuit

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Description
This is a circuit I have designed for guitar effect builders, I was very unsatisfied with the way everyone was using just a plain old double pole double throw click switch for the bypassing. Most of the time it was very scratchy sounding using that method and I experienced loud pops in my amplifier when switching from straight through to effect. Observing my "Boss" pedals and how they were switched on and off I figured there must be more to it. It took me only about 4 hours to design and test this circuit, It works very well and I'm really satisfied with it so I'll be using it in all the effect pedals I build. It's a very clean bypass both electronically and mechanically.

How it works: the first stage in the schematic is a 4011 nand gate chip set up as a debounced switch to give the logic pulses from the switch to the flip flop. The second stage is the flip flop, this is a 4027 JK flip flop set up in toggle mode, this controls the switching of the 4016 which is an analog switch, this part controls the bypass. That's about all there is to it. The effect which I have used this in so far is a home built "MXR hot tubes distortion" effect. Feel free to put this up on your site and mail it around to friends. The only credit I ask of this is that my name remains on the schematic. Original artile sourse ee.washington.edu

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High Voltage Solid-State Circuits for Tube Guitar Amplifiers

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Circuit Description

The IRF820  MOSFET has a  voltage rating of  500v, it should  work well in  preamp stages of  most tube amps. The 100 ohm  resistor is there  to suppress H.F.  oscillations. If  IRF820 is  physically close  to the 12AX7  plate, you  probably won't  need it. You can see how the MOSFET is equivalent to a triode: Source/Cathode; Gate/Grid; Drain/Plate

You cannot use the MOSFET as a direct replacement for a typical tube gain stage. The MOSFET will not "self bias" like a typical cathode-biased tube stage.The MOSFET is an "enhancement device" while a triode is a "depletion" device. In this circuit, it is not necessary to use a heatsink on the IRF820. You can if you want.

High voltage solid state guitar amplifier

High voltage solid state pream stage guitar amplifier

High voltage solid state reverb driver guitar amplifier

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Guitar Reverb Effect

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Description
The guitar input stage is a class A amplifier with adjustable bias. A 2N3906 PNP tranistor is used for a low noise design on this stage. The output of the preamp stage is sent to three places: the output mixer amp, the reverb driver amp, and the input clipping detector.

The reverb driver amp consists of a phase inverting push-pull circuit made from dual sections of a 5532 high quality audio op-amp. This provides a voltage swing of approximate twice the supply voltage to the reverb impedance matching transformer, allowing higher power transfer. The 100 ohm resistor is critical for insuring a clean drive signal, without it, the op-amps can saturate when driving the transformer, producing unwanted distortion.

The transformer matches the impedance of the driver amplifer to the reverb driver coil and allows a dual phase driving signal to power a reverb coil with one grounded side. The transformer is a standard "70 volt" audio line transformer that is often found on PA systems. One reader reported having good results using a Mouser 42TU013 (1K to 8 ohm) transformer. If you can find a reverb tank with a high impedance driver coil, the transformer may be eliminated, the driver coil will require isolation from ground.

The output of the reverb tank is sent to the reverb recovery amp, it is also a 2N3906 class A low noise stage.

The mixer amplifier is a 2N3904 transistor biased for class A operation. It mixes the dry signal from the input preamplifer with the wet signal from the reverb recovery amp through two 10K resistors. The wet signal level is adjusted by a 10K potentiometer.

The clipping detector stages receive inputs from the guitar preamp and the reverb recovery amp, they act in an identical manner. The 1458 op-amp is wired as a comparator with a threshold that is near the high side of the allowable voltage swing on the associated 2N3906 preamp stage. If the transistor output exceeds this voltage, the 1458 output turns on, causing the 4011 one-shot pulse stretcher circuit to fire. The one-shot circuit activates the LED, and stays on long enough that even minor clipping on the amplifier causes visible blinking.

The power supply filter involves an RC filter between the DC input and the VF1 power bus. VF1 drives the reverb driver, the output amp, and the clipping circuit. VF2 and VF3 are further filtered with their own RC filters, they provide isolated DC for powering the input preamp and reverb recovery amplifier stages.


Guitar Reverb Effect Circuit


Original article sourse solorb.com
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2/02/2014

Mini Portable Guitar Amplifier

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Guitar Circuit description:

     This small amplifier was intended to be used in conjunction with an electric guitar to do some low power monitoring, mainly for practice, either via an incorporated small loudspeaker or headphones. The complete circuit, loudspeaker, batteries, input and output jacks can be encased in a small box having the dimensions of a packet of cigarettes, or it could be fitted also into a real packet of cigarettes like some ready-made units available on the market. This design can be used in three different ways: Loudspeaker amplifier: when powered by a 9V alkaline battery it can deliver about 1.5W peak output power to the incorporated loudspeaker.  Headphone amplifier or low power loudspeaker amplifier: when powered by a 3V battery (2x1.5V cells) it can drive any headphone set type at a satisfactory output power level or deliver to the incorporated loudspeaker about 60mW of output power. This configuration is useful for saving battery costs. Fuzz-box: when powered by a 3V battery (2x1.5V cells) and having its output connected to a guitar amplifier input the circuit will behave as a good Fuzz-box, showing an output square wave with marked rounded corners, typical of valve-circuits output when driven into saturation. 

Guitar amplifier circuit diagram:


Guitar amplifier partlist:
  • R1__________22K 1/4W Resistor
  • C1__________10µF 25V Electrolytic Capacitor
  • C2__________100nF 63V Polyester or Ceramic Capacitor
  • C3__________220µF 25V Electrolytic Capacitor
  • IC1_________TDA7052 Audio power amplifier IC
  • J1,J2_______6.3mm Stereo Jack sockets (switched)
  • SPKR_______8 Ohm Loudspeaker (See Notes)
  • B1_________9V PP3 Battery or 3V Battery (2 x 1.5V AA, AAA Cells in series etc.)
  • Clip for PP3 Battery or socket for 2 x 1.5V AA or AAA Cells

Technical data:

  • Max output power: 1.5W @ 9V supply - 8 Ohm load; 60mW @ 3V supply - 8 Ohm load
  • Frequency response: Flat from 20Hz to 20kHz
  • Total harmonic distortion @ 100mW output: 0.2%
  • Max input voltage @ 3V supply: 8mV RMS
  • Minimum input voltage for Fuzz-box operation: 18mV RMS @ 3V supply
  • Current consumption @ 400mW and 9V supply: 200mA
  • Current consumption @ 250mW and 9V supply: 150mA
  • Current consumption @ 60mW and 3V supply: 80mA
  • Quiescent current consumption: 6mA @ 9V, 4mA @ 3V supply
  • Fuzz-box current consumption: 3mA @ 3V supply
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70 Watt Guitar Amplifier

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Guitar Amplifier description:



Guitar Amplifier parts list:

R1______________18K 1/4W Resistor
R2_______________3K9 1/4W Resistor
R3,R6____________1K 1/4W Resistors
R4_______________2K2 1/4W Resistor
R5______________15K 1/4W Resistor
R7______________22K 1/4W Resistor
R8_____________330R 1/4W Resistor
R9,R10__________10R 1/4W Resistors
R11,R12_________47R 1/4W Resistors
R13_____________10R 1W Resistor
C1_______________1µF 63V Polyester Capacitor
C2_____________470pF 63V Polystyrene or Ceramic Capacitor
C3______________47µF 25V Electrolytic Capacitor
C4______________15pF 63V Polystyrene or Ceramic Capacitor
C5_____________220nF 100V Polyester Capacitor
C6_____________100nF 63V Polyester Capacitor
 D1,D2,D3,D4___1N4148 75V 150mA Diodes 
Q1,Q2________BC560C 45V 100mA Low noise High gain PNP Transistors
Q3,Q4________BC556 65V 100mA PNP Transistors
Q5___________BC546 65V 100mA NPN Transistor
Q6___________BD139 80V 1.5A NPN Transistor
Q7___________BD140 80V 1.5A PNP Transistor
Q8__________MJ2955 60V 15A PNP Transistor
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