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Showing posts from November, 2014

Programing UART in ARM Microcontrollers

A UART is usually an individual (or part of an) integrated circuit used for serial communications over a computer or peripheral device serial port. UARTs are now commonly included in microcontrollers. A dual UART, or DUART, combines two UARTs into a single chip. An octal UART or OCTART combines eight UARTs into one package, an example being the NXP SCC2698. Many modern ICs now come with a UART that can also communicate synchronously; these devices are calledUSARTs (universal synchronous/asynchronous receiver/transmitter).
Programing UART in ARM Microcontrollers: you can find here:

Programming tutorial adc ARM Microcontrollers

So, the microcontrollers today offering a more and simple solution our lives. One of the controllores is LPC11Cx2. The LPC11Cx2/Cx4 are an ARM Cortex-M0 based, low-cost 32-bit MCU family, designed  for 8/16-bit microcontroller applications, offering performance, low power, simple instruction set and memory addressing together with reduced code size compared to existing 8/16-bit architectures.The LPC11Cx2/Cx4 operate at CPU frequencies of up to 50 MHz. The peripheral complement of the LPC11Cx2/Cx4 includes 16/32 kB of flash memory, 8 kB of data memory, one C_CAN controller, one Fast-mode Plus I2C-bus interface, one RS-485/EIA-485 UART, two SPI interfaces with SSP features, four general purpose counter/timers, a 10-bit ADC, and up to 40 general purpose I/O pins.On-chip C_CAN drivers and flash In-System Programming tools via C_CAN are included. In addition, the LPC11C22 and LPC11C24 parts include an on-chip, high-speed CAN transceiver.  One of intereting article you can find here www.gadg…

Arduino Uno Rev3 schematic

Auto ranging ohmmeter using arduino

This article is about a simple auto ranging ohmmeter using arduino. The measured resistance is displayed using a 16×2 LCD display. The circuit is sufficiently accurate and uses minimum number of external components possible. Before going into the details of this project, lets have a look at the basic resistance measurement method.
Resistance measurement.
The figure above shows the circuit diagram of a simple resistance measurement scheme. Rx is the resistance to be measured. R1 is the input resistance. i is the current passing through the loop and 5V is the supply voltage. To find the unknown resistance Rx, the voltage across Rx is measured first. let the voltage across R1 be VR1. Then VR1=5-Vx. The current i=VR1/R1=(5-Vx)/R1. Since R1 and Rx are connected in series, the current through them will be equal. So the unknown resistance Rx= Vx/i. The voltage across the unknown resistance is measured using the ADC of the arduino. To be precise, analog channel A5.
Anyway this method have a …

Dual Audio Power Amplifier 6 W × 2 Ch

TA8246AH is dual power amplifier for Consumer applications. This IC provides an output power of 6 watts per channel (at VCC = 20 V, f = 1 kHz, THD = 10%, RL = 8 Ω). It is suitable for power amplifier of TV and home Stereo.  Circuit diagram:

22W x 4 Channel Audio Amplifier Circuit Diagram TA8255AH

30 watt 4 Channel audio amplifier IC

Circuit diagram for TA8251AH:

6mW 1.5V Stereo Headphone Amplifier

The TA8159FN developed for play−back stereo headphone  equipments (1.5V use). It is built in dual auto−reverse pre  amplifiers, dual OCL power ampilfiers, and a ripple filter. 
Circuit Diagram:

7.3W x 2CH audio amplifier ic


TA8233H Circuit Diagram

Dual pre power amplifier , dc volume control

5W mono audio amplifier

The TDA7056B is a mono Bridge-Tied Load (BTL) output amplifier with DC volume control. It is designed for use in TV and monitors, but is also suitable for battery-fed portable recorders and radios. The device is contained in a 9-pin medium power package.
Circuit Diagram:

Dual 6 to 8 watt audio power amplifier

The HA1394 dual audio power amplifier is specifically designed for audio outputs in modular stereos and mutiplex sound TV's. This HItachi amplifier can deliveri 8.2w per ch when Vcc=25V.
Circuit Diagram:

2.5W Audio Power Amplifier

The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. A unique input stage allows ground referenced input signals. The output automatically selfcenters to one-half the supply voltage. Circuit diagram:

4 x 11 W or 2 x 22 W power amplifier

General Description: The TDA1554Q is an integrated class-B output amplifier in a 17-lead single-in-line (SIL) plastic power package.The circuit contains 4 x 11 W single-ended or 2 x 22 W bridge amplifiers. The device is primarily developed for car radio applications. Circuit Diagram:
Datasheet for TDA1554Q: Download

Dual Audio Power Amplifier

General Description:
The TA8211AH is dual audio power amplifier for consumer applications.  This IC provides an output power of 6 watts per channel  (at VCC = 20 V, f = 1 kHz, THD = 10%, RL = 8 Ω).  It is suitable for power amplifier of TV and home stereo. 
Features: High output power: Pout = 6 W/channel (Typ.)  (VCC = 20 V, RL = 8 Ω, f = 1 kHz, THD = 10%)  Low noise: Vno = 0.14 mVrms (Typ.)  (VCC = 28 V, RL = 8 Ω, GV = 34dB, Rg = 10 kΩ,  BW = 20 Hz~20 kHz)  Very few external parts  Built in thermal shut down protector circuit  Operating supply voltage range: VCC (opr) = 10~30 V (Ta = 25°C) 
Circuit Diagram:

24 W BTL or 2 x 12 W stereo car radio power amplifier

General Description: The TDA1515BQ is a monolithic integrated class-B output amplifier in a 13-lead single in-line (SIL) plastic power package. The device is primarily developed for car radio applications, and also to drive low-impedance loads (down to 1,6 Ω). At a supply voltage VP = 14,4 V, an output power of 24 W can be delivered into a 4 Ω BTL (Bridge Tied Load), or, when used as stereo amplifier, it delivers 2 × 12 W into 2 Ω or 2 × 7 W into 4 Ω. 
Features: flexibility in use − mono BTL as well as stereohigh output powerlow offset voltage at the output (important for BTL)large usable gain variationvery good ripple rejectioninternal limited bandwidth for high frequencieslow stand-by current possibility (typ. 1 µA), to simplify required switches; TTL drive possiblelow number and small sized external componentshigh reliability.he following currently required protections are incorporated in the circuit. These protections also have positive influenceon reliability in the applications.loa…

Audio Power Amplifier 5.8W

General Description:
The NTE1285 and NTE1286 are audio power amplifiers in a 7–Lead SIP type package designed especially for car radio and car stereo applications. These devices are encapsulated in newly developed small packages featuring low thermal resistance, providing easy design for 2Ω. At 14.4V the devices give output power of 7W with RL = 4Ω and 11W with RL = 2Ω.
High Output Power Low Transient Noise at Power Supplu Switch ON Mirror Image Pin Configurations Protection Circuits are Provided for the Following: Load Dump Protection Thermal Shut–Down Protection Overvoltage Protection Output Terminal Short–Circuit Protection

60 W Quad Half-Bridge Digital Amplifier

General Description: The CS44130 is a high-efficiency power stage for digital Class-D amplifiers designed to recieve PWM signals from a modulator such as the CS44800/600. The power stage outputs can be configured as four half-bridge channels, two half-bridge channels and one full-bridge channel, two full-bridge channels, or one parallel full-bridge channel. Features:  Configurable Outputs (10% THD+N) – 2 x 30 W into 8 Ω, Full-Bridge – 1 x 60 W into 4 Ω, Parallel Full-Bridge – 4 x 15 W into 4 Ω, Half-Bridge – 2 x 15 W into 4 Ω, Half-Bridge + 1 x 30 W  into 8 Ω, Full-Bridge  Space-Efficient, Thermally-Enhanced QFN  Package  PWM Popguard® Technology for Quiet Startup  > 100 dB Dynamic Range - System Level  < 0.12% THD+N @ 1 W - System Level  Built-In Protection with Error Reporting – Over-Current – Thermal Warning – Thermal Fault – Under-Voltage  Single (+10.8 V to +21 V) High Voltage Supply  High Efficiency (90%)  Low RDS(ON)  Low Quiescent Current  Low Power Standby Mode Common Applications  …

43 W BTL × 4-ch Audio Power IC

Overview: The TB2904H (o) is 4-ch BTL audio amplifier for car audio applications.  This IC can generate higher power: POUT MAX = 43 W as it includes the pure complementary P-ch and N-ch DMOS output stage. It is designed to yield low distortion ratio for 4-ch BTL audio power amplifier, built-in standby function, muting function, and various kinds of protectors. 
Circuit Diagram: Datasheet for TB2904H:Download

47 Watt 4-channel Audio Power Circuit Diagram

The TB2903HQ is 4-ch BTL audio amplifier for car audio applications. This IC can generate higher power: POUT MAX = 47 W as it includes the pure complementary P-ch and N-ch DMOS output stage. It is designed to yield low distortion ratio for 4-ch BTL audio power amplifier, built-in standby function, muting function, and various kinds of protectors. Additionally, Off-set detector is built in.  Features  High power output POUT MAX (1) = 47 W (typ.) VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω) Built-in standby switch function (pin 4) Built-in muting function (pin 22) Built-in Off-set detection function (pin 25) Thermal shut down, overvoltage, out to GND, out to VCC, out to out short Operating supply voltage: VCC (opr) = 9~18 V (RL = 4 Ω) Circuit Diagam: Datasheet for  TB2903HQ:Download

18W+18W Stereo Amplifier

General Description:
The TDA7265SA is class AB Dual Audio Power amplifier assembled in the @ Clipwatt 11 package, specially designed for high quality sound application as Hi-Fi music centers and stereo TV sets. The TDA7265SA is pin to pin compatible with TDA7269, TDA7269A, TDA7269SA, TDA7265,TDA7499, TDA7499SA. 
Circiut Diagram:

5.4W Dual Audio Power Amplifier

General Description:
The BA5415A and BA5416 are dual power amplifier ICs that operate off a 9V to 15V supply. When driving a 4Ω load off a 9V supply, the BA5415A does not require a heatsink. The BA5416 uses a lost-cost package. The basic characteristics (total harmonic distortion etc.) of the amplifiers are excellent, and both ICs include a standby switch function. Features

High output.POUT = 5.4W (VCC = 12V, RL = 3Ω and THD = 10%)POUT = 2.5W (VCC = 9V, RL = 4Ω and THD = 10%)Excellent audio quality.THD = 0.1% (f = 1kHz, PO = 0.5W)VNO = 0.3mVrms (Rg = 10kΩ)RR = 60dB (fRR = 100Hz)Wide operating power supply voltage range.VCC = 5.0V to 18.0V (BA5416 : 5.0V to 15.0V)Switching noise (ìpopî noise) generated when the power is switched on and off is small.Ripple mixing when motor starts has been prevented.Built-in thermal shutout.Built-in standby switch.Output is not influenced by the standby pin voltage.Mute time does not depend on VCC.Soft clipping.Heatsink not required  (for BA5415A, with VCC…

1W Per Channel Stereo Class-D Audio Power Amplifier

1 watt per channel with 8-ohm loadMax. efficiency » 80% with 8-ohm load at 5 voltsFilterlessDigital gain controlBuild-in depop circuitryError protection for short circuit and over-temperatureMute (shutdown) current < 1µA typicalLow operating current (4mA at 5 volts without load)TSSOP 24L package available 
General Description The AP130 is an oversampling class-D power amplifier for  stereo audio applications. It provides high power-efficiency for filterless 8-ohm load. Build-in depop, mute and gain control features simplify the applications. BTL (Bridge-Tied-Load) configuration delivers up to 1 watt into 8-ohm load per channel at 5-V supply voltage. It allows direct coupling of the power signal. Reliability is improved through over-temperature and short circuit protections. The class-D power amplifier enables high efficiency applications for portable devices.
Circuit Diagram

70W x 1ch BTL Power Amplifier

Circuit diagram for AN17850A:

Audio power amplifier IC

Dual 6.5 power audio amplifier.

Audio signal processing 1 W × 2-channel

Overview: AN12942B is an one-chip IC for the stereo speakers which can output 1 W by 8 Ω, headphone amplifiers, line amplifiers, and electronic volumes. The AGC circuit is built-in to prevent the resonance or the vibration by the speaker’s energy and the clipping distortion what is  called "broken up sound".  Also the AN12942B is built-in power saving on/off function automatically detecting input signal to save the power of speaker  amplifier.
Circuit Diagram:

Audio power IC for mp3 Player

Overview: The AN12941A is an amplifier IC for stereo  speakers which can output 1 W by 8 Ω or 2 W by 4 Ω. The AGC circuit is built-in to prevent the resonance  or the vibration by the speaker's energy and the  clipping distortion what is called "broken up sound."  of the speakers. Also, to reduce power consumption, AN12941A  has a built-in function which automatically detects the  input signal and can automatically enter power save  mode when there is no signal. Features: Speaker amplifier is1 W × 2-channel: 8 Ω, VCC = 5 V or2 W × 2-channel: 4 Ω, VCC = 5 VBuilt-in AGC circuit Prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker by AGC at excessive input signal (with AGC on/off switch).Built-in automatic power saving function It detects input signals and switches on/off (with the on/off switch for the automatic power saving).Operating supply voltage: VCC 3.0 V to 5.5 V/ VCC_SP 3.0 V to 5.5 VCircuit Diagram:

Auto Radio Amplifier Circuit

„ Features

Dual 10 W audio power amplifierBuilt-in muting circuitIncorporating protection circuitLow frequency amplifierSIL-12 pin plastic package (Power-type with fin)Circuit Diagram:

Stereo 50W Audio Power Amplifier

FEATURES DESCRIPTION The LM4732 is a stereo audio amplifier capable of 2 typically delivering 50W per channel of continuous The LM4732 has short circuit protection and a APPLICATIONS thermal shut down feature that is activated when the  The LM4732 also has an under voltage lock out feature for click and Each amplifier of the LM4732 has an independent KEY SPECIFICATIONS The LM4732 has a wide operating supply range from +/-10V - +/-40V allowing for lower cost unregulated power supplies to be used.

• Mute Attenuation 110dB (typ) • PSRR 89dB (typ) • Slew Rate 19V/μs (typ) • Low External Component Count • Quiet Fade-in/out Mute Mode average output power into a 4Ω or 8Ω load with less • Wide Supply Range: 20V - 80V than 10% THD+N from 20Hz - 20kHz. • Audio Amplifier for Component Stereo die temperature exceeds 150°C. • Audio Amplifier for Self-powered Speakers • Output Power/Channel at 10% THD+N, 1kHz  • Audio Amplifier for Compact Stereo pop free power on and off. • Audio Amplifier for High-e…

Three Channel Audio Mixer

General Description: Above schematic is for a three channel audio mixer. That will provide an overall gain of one between the output and each input channel. Each input channel includes a single 0.1uf capacitor and 100-Kilohms resistor to provide an output impedance of 100K. The number of input channels to this audio mixer can be increased by adding more capacitors and resistors with same value as capacitor(0.1uf) and resistor(100K). The mixer should be located between the output of tone control circuitry and the input to the power amplifier. One input should be taken from the output of the tone control circuit, and the other inputs should either be grounded or taken from desired source. Circuit diagram:

Audio Mixer

General Description: A new audio mixer circuit uses an LM3900 IC but is not a profesional audio dj mixer. The IC houses four integrated Norton amplifiers. The advantage of using the four op amps is that they only need a single power supply. Since this amplifier circuit is current controlled, the DC bias is dependent on the feedback coupling.The schematic diagram shows inverting AC-Norton amplifiers. The DC output must be set at 50 percent of the power supply. In this case, a maximum output can be achieved without distortion (also called symmetrical limitation through overdrive).In designing this mini audio mixer circuit diagram you can freely choose the value of the resistor R2 (100k in the mixer schematic). Set the AC voltage amplification factor through the ration of R2/R1. To set the amplifier gain correctly, choose the value of R4=2R2 (double the value of R2).Diagram 1.0 shows the 3-channel sound mixer circuit using three Norton-opamps. The input levels can be set by potentiometers…