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.

LM378 dual4-watt amplifier Mini-stereo

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:

Circuit diagram for Dual Audio Power Amplifier 

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 = 9V and RL ≥ 4Ω).

Circuit Diagram:

5.4W Dual Audio Power Amplifier

Datasheet for BA5415A: Download