This is the circuit diagram of a 35W audio amplifier based on LM391. LM391 is a comprehensive driver for power transistors. It requires few external components to work. With TR1, we can adjust the bias current to 45mA. The inductor L1 consists of 20 turns of 0.9mm thick wire, wound around the resistor R16. The transistor Q3-4 must be placed on a heat sink. If you use Q3-4 of type TIPxxxx, you can place it directly on the board. But if you use packaged transistors TO-3, you should use short cables to connect it to the corresponding place on 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 = 100 ohms | C4,8,9 = 1nF 100V MKT | Q1 = BD139 |
| R13 = 47Kohm | C5 = 47nF 100V MKT | Q2 = BD140 |
| R14,15=0.15 ohm 5W | C6 = 22pF Ceramic | Q3 = TIP2955 |
| R16=1 ohm 2W carbon 5% | C7,11,12,13 = 100nF 100V MKT | Q4 = TIP3055 |
| R17=10 ohm 1W carbon 5% | C10 = 22pF Ceramic | L1 = See text |
Bottom (chopper) PCB layout: Top (component) PCB layout:
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