35W Audio Amplifier based LM391

35W audio power amplifier circuit based LM391

This is the circuit diagram of a 35W audio amplifier based on LM391. The LM391 is a comprehensive driver to the power transistors. It needs only few external components to work. With the TR1 we can adjust the bias current to 45mA. Inductor L1 consists of 20 turns of wire thickness of 0.9mm, around the resistor R16. The transistors Q3-4 must be placed onto a heatsinks. If you use the Q3-4 with type of TIPxxxx, you can be placed directly onto the board. But if you use packaged transistors TO-3, then it should be connected with short cables to the respective positions of the board.

Parts List

R1,3,5,8,10 = 1Kohm C1 = 2.2uF 63V TR1 = 10K Trimmer
R2,7,11 = 100Kohm C2 = 4.7uF 25V D1,2 = IN4002
R4,6 = 4.7Kohm C3,17 = 47uF 63V IC1 = LM391
R9,12 = 100ohm C4,8,9 = 1nF 100V MKT Q1 = BD139
R13 = 47Kohm C5 = 47nF 100V MKT Q2 = BD140
R14,15 = 0.15ohm 5W C6 = 22pF ceramic Q3 = TIP2955
R16 = 1ohm 2W carbon 5% C7,11,12,13 = 100nF 100V MKT Q4 = TIP3055
R17 = 10ohm 1W carbon 5% C10 = 22pF ceramic L1 = See text

Bottom (chopper) PCB layout:
35W audio power amplifier circuit based LM391 - bottom pcb layout

Top (component) PCB layout:

35W audio power amplifier circuit based LM391 - top pcb layout

Incoming search terms:

Tags: 35W amplifier circuit 35W amplifier schematic 35W audio amplifier 35W power amplifier LM391 circuit

Related Post "35W Audio Amplifier based LM391"

1 Watt Stereo Audio Amplifier based IC KA2209
Above schematic diagram is 1 Watt stereo
40W Power Amplifier based Transistor TIP33 / TIP34
This is the circuit diagram of 40W
Stereo Pre-amp with Volume and Tone Control
This is the circuit diagram of stereo
350 Studio Amplifier Circuit Scheme and PCB Layout
Above scheme is the circuit diagram of

Leave a reply "35W Audio Amplifier based LM391"