Wednesday, November 24, 2010
Here is a 35 Watt audio amplifier circuit based LM391 chip. The LM391 Audio Power Driver is designed to drive external Power Transistors in 10 to 100 watt power Amplifier designs. High power supply voltage operation and true high fidelity performance distinguish this IC. The LM391 is internally pro- tected for output faults and thermal overloads; circuitry pro- viding output Transistor protection is user programmable. By National Semiconductor
Rangkaian 35 Watt Power AmplifierBased on LM391
The circuit was designed to drive the power transistors of a power amplifier that will produce a power output of 35 Watts. Inductor L1 is constituted by 20 coils of wire, with thickness 0.9mm, round resistor R16. Transistors Q3-4 should be placed on heatsink. If are used the Q3-4 in packing TIPxxxx they can be placed straight above in PCB. If however they are used transistor in packing TO-3, then it will be supposed they are connected with short cables in the corresponding places on PCB.
List componet of 35 Watts amplifier LM391 circuit
- R1-3-5-8-10 = 1Kohm
- R2-7-11 = 100Kohm
- R4-6 = 4.7Kohm
- R9-12 = 100ohm
- R13 = 47Kohm
- R14-15 = 0.15ohm 5W
- R16 = 1ohm 2W carbon 5%
- R17 = 10ohm 1W carbon 5%
- C1 = 2.2uF 63V
- C2 = 4.7uF 25V
- C3-17 = 47uF 63V
- C4-8-9 = 1nF 100V MKT
- C5 = 47nF 100V MKT
- C6 = 22pF ceramic
- C7-11-12-13 = 100nF 100V MKT
- C10 = 22pF ceramic
- TR1 = 10K Trimmer
- D1-2 = IN4002
- IC1 = LM391
- Q1 = BD139
- Q2 = BD140
- Q3 = TIP2955
- Q4 = TIP3055
- L1 = See text
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