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Description: The NTE7011 is an integrated circuit in a 12−Lead SIP type package designed for use as a BTL power  amplifier with built−in headphone amp for portable stereo applications. Typical applications include  portable component stereos, car stereo, radio cassette recorders, and TV sound multiplex output. Features:  Low Quiescent Current, Low Distortion, Low Noise, High Output Power  Wide Supply Voltage range: VCC = 6 to 26V  Built−In Muting Circuit  Built−In Protection Circuits: Temperature, Surge, Overcurrent  Built−In Headphone Amplifier Circuit

Amplifiers which run from 12V DC generally don’t put out much power and they are usually not hifi as well. But this little stereo amplifier ticks the power and low distortion boxes. With a 14.4V supply, it will deliver 20 watts per channel into 4-ohm loads at clipping while harmonic distortion at lower power levels is typically less than 0.03%. This is an ideal project for anyone wanting a compact stereo amplifier that can run from a 12V battery. It could be just the ticket for buskers who want a small but gutsy amplifier which will run from an SLA battery or it could used anywhere that 12V DC is available – in cars, recreational vehicles, remote houses with 12V DC power or where ever. 20W Stereo Audio Amplifier Because it runs from DC, it will be an ideal beginner’s or schoolie’s project, with no 240VAC power supply to worry about. You can run it from a 12V battery or a DC plugpack. But while it may be compact and simple to build, there is no need to apologise for “just average” pe...

Here is an audio amplifier based on the TDA7240 IC from ST Microelectronics. The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. Circuit diagram : 20W Rangkaian Audio Amplifier  Circuit Diagram This circuit of audio amplifier based IC TDA7240 can deliver 20 watts of audio output power into a 4ohm load. The IC has minimum external parts count and is available in the 7 pin compact Heptawatt package. The IC also has a lot of good features like loud speaker protection, short circuit protection, low noise, low distortion etc. The circuit can be operated from a 12V DC single power supply and this makes it very useful in car audio application. Notes : Use 4 ohm, 20W speaker. S1 is the standby switch and S2 is the ON/OFF switch. LED D2 is a power ON indicator. give good cooling at TDA7240 IC.

This is the Simple 20W 1296Mhz Amplifier Module Circuit Diagram. This circuit Using a Mitsubishi M57762-amplifier module, this amplifier delivers 20-W output on 1296 MHz. A single 12-V nominal power supply can be used. Simple 20W 1296Mhz Amplifier Module Circuit Diagram

20W CLASS-A POWER AMPLIFIER ELECTRONIC DIAGRAM The 0.25 Ohm resistor should cause little grief (4 x 1 Ohm 1W resistors in parallel), but some experimentation may be needed here, since the base-emitter voltage of the BC549 determines the current. This circuit works by using the BC549 to steal any excess base current from the compound pair. As soon as the voltage across the 0.25 Ohm resistor exceeds 0.65V, the transistor turns on and achieves balance virtually instantly. The 1k trimpot in the collector of the first LTP transistor allows the DC offset to be adjusted. The nominal value is around 400 ohms, but making it variable allows you to set the output DC offset to within a few mV of zero.