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Showing posts from June, 2014

How to Match a Car Subwoofer and Amplifier

Need help knowing how to match a car subwoofer and amplifier? Tired of your friends constantly asking you to pair a sub and amp for them? Watch this video (or send it to a friend) and learn about the three major points of matching subwoofers and amps:

The Total RMS of the SystemThe Final Impedance of the SystemTypes of Amplifiers
In this video we use the 750 watts RMS Kicker CVX (CompVX) subwoofer and the Kicker ZX750.1 amplifier (750 watts RMS @ 2 ohm) as an example of a perfectly matched subwoofer and amp.

Subwoofer Design Software

Bandpass Designer Software calculates 4th order bandpass theoretical enclosures and boxes.

Download >>
Input Parameters:




The following Theile Small speaker parameters are required for input. These values should be included with your speaker manual or can be found on the manufacture's web site. 
Qts -  Total Q of the speakerQes - Speaker electrical QFs - Free air resonance of speaker in HzVas - Volume of air equal to the speakers spring characteristics in litersPmax - Maximum power of the driver in wattsDiameter - The diameter of the driver in cmXmax - The amount of cone movement in one direction in mmDp - Diameter of the port(s) in cmPorts - Number of ports




The following speaker parameters are user defined inputs. These values should be inputted by user preference. 
Gain: dB increase of the system:
S: RippleS = 0.5 - Degraded response pronounced rippleS = 0.6 - Slightly degraded response slight rippleS = 0.7 - Best transient response no ripple

NOTES:

MAKE SURE THE UNITS MATCH (…

Subwoofer Circuit Board from Aliexpress

Electronic Subwoofer Amplifier Circuit from Aliexpress

1 to 4 W audio power amplifier

General Description:
The TDA1015 is a monolithic integrated audio amplifier circuit in a 9-lead single in-line (SIL) plastic package. The device is especially designed for portable radio and recorder applications and delivers up to 4 W in a 4 Ω load impedance. The very low applicable supply voltage of 3,6 V permits 6 V applications. 1 to 4 W audio power amplifier
Special features:
single in-line (SIL) construction for easy mountingseparated preamplifier and power amplifierhigh output powerthermal protectionhigh input impedancelow current drainlimited noise behaviour at radio frequenciesCircuit Diagram:
Datasheet for TDA1015:Download

4 W audio power amplifier with DC volume control

GENERAL DESCRIPTION:
The TDA1013B is an integrated audio amplifier circuit with DC volume control, encapsulated in a 9-lead single in-line (SIL) plastic package. The wide supply voltage range makes this circuit ideal for applications in mains and battery-fed apparatus such as television receivers and record players. The DC volume control stage has a logarithmic control characteristic with a range of more than 80 dB; control is by means of a DC voltage variable between 2 and 6.5 V. The audio amplifier has a well defined open loop gain and a fixed integrated closed loop. This device requires only a few external components and offers stability and performance. 4 W audio power amplifier with DC volume control
Features:
Few external componentsWide supply voltage rangeWide control rangePin compatible with TDA1013AFixed gainHigh signal-to-noise ratioThermal protectionPINNING:

power groundamplifier outputsupply voltageelectronic filteramplifier inputcontrol unit outputcontrol voltagecontrol unit …

Stereo headphone amplifier

General Description:

The LM4910 is an audio power amplifier primarily designed for headphone applications in portable device applications. It is capable of delivering 35mW of continuous average power to a 32Ω load with less than 1% distortion (THD+N) from a 3.3VDC power supply. The LM4910 utilizes a new circuit topology that eliminates output coupling capacitors and half-supply bypass capaci-tors (patent pending). The LM4910 contains advanced pop & click circuitry which eliminates noises caused by transients that would otherwise occur during turn-on and turn-off. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4910 does not require any output coupling capacitors, half-supply bypass capaci-tors, or bootstrap capacitors, it is ideally suited for low-power tors, or bootstrap capacitors, it is ideally suited for low-power sumption are primary requirements.  Amplifier circuit
Features

LM2005 20 Watt Automotive Power Amplifier

General Description for LM2005:

The LM2005 is a dual high power amplifier, designed to deliver optimum performance and reliability for automotive deliver optimum performance and reliability for automotive vice to deliver 10W/channel into 2X (LM2005T-S), or 20W bridged monaural (LM2005T-M) into 4X, with low distortion. 
Features for LM2005:

Wide supply range (8V –18V)
Externally programmable gain
With or without bootstrap
Low distortion
Low noise
High peak current capability
POe20W bridge
High voltage protection
AC and DC output short circuit protection to ground or across load
Thermal protection
Inductive load protection
Accidental open ground protection
Immunity to 40V power supply transients
3§C/W device dissipation
Pin for pin compatible with TDA2005

Circuit diagram for LM2005:

Datasheet for LM2005:Download

20W Audio Power Amplifier LM1875

General Descripton for 20W Audio Power Amplifier:
The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.
Features for 20W Audio Power Amplifier:

Up to 30 watts output powerAVO typically 90 dBLow distortion: 0.015%, 1 kHz, 20 WWide power bandwidth: 70 kHzProtection for AC and DC short circuits to groundT…