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LM378 dual4-watt amplifier Mini-stereo

This circuit is built around two chips: the MC1458 dual op amp, configured as a preamplifier, and the LM378 dual4-watt amplifier. The gain of the preamp is given by R3/R1 for one side and R4/R2 for the other side, which is about 100. That gain can be varied by increasing the ratios. The left and right channel inputs are applied to pins 2 and 6. The left and right outputs of U1 at pins 7 and 2 are coupled through CS/ RlO and C3/R6, respectively, to U2 to drive the two 8-0loudspeakers.

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:

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…