Saturday, October 3, 2009
This is a circuit of 1 watt amplifier stereo using two IC LM386N. This circuit belongs to kitsrus.com and the kit is available there or at electronickits.com. This circuit only need 10mA current with best voltage supply is 6-12VDC. No heatsink required for normal usage.
the amplifier circuit only a few external components, the IC contains most of the necessary circuitry. C1, C5 are the input coupling capacitors, which block any DC that might be present on the inputs. C2, C9 maintain DC bias levels in the gain adjustment (feed back) circuit. C4 provides power supply decoupling, and C6, C8 are the output coupling capacitors. C10, R1 and C11, R2 act as zobel networks providing a high frequency load to maintain stability where loud speaker inductive reactance may become excessive. The pot provides adjustable input level attenuation.
layout 1 watt Amplifier stereo
the amplifier circuit only a few external components, the IC contains most of the necessary circuitry. C1, C5 are the input coupling capacitors, which block any DC that might be present on the inputs. C2, C9 maintain DC bias levels in the gain adjustment (feed back) circuit. C4 provides power supply decoupling, and C6, C8 are the output coupling capacitors. C10, R1 and C11, R2 act as zobel networks providing a high frequency load to maintain stability where loud speaker inductive reactance may become excessive. The pot provides adjustable input level attenuation.
layout 1 watt Amplifier stereolist Components :
Capacitors :
C1, C5 2.2 uF / 50Vecap
C2, C9 10 uF / 25V ecap
C3, C7 100 nF mono (104)
C4 100 uF / 16V ecap
C6, C8 470 uF / 16V ecap
C10, C11 47 nF mylar (473)
Resistors :
R1, R2 10 ohm (brown, black, black)
Pot 1 10k ohm dual gang log pot. (A)
Misc. :
Kit 115V2 Printed Circuit Board
IC 1, 2 LM386N Integrated Circuit
8 pin IC socket
2 pin header and jumper 2 sets
Specifications :
- D.C. input : 4 – 12 V at 200 – 500 mA max.
- Idle current : ~ 10 mA
- Power output : > 1 Watt max. @ 8 ohms, 12V DC, ~ 0.4 Watt RMS cont. per channel
- Freq. Resp. : ~ 40 Hz to 100 kHz, 8 ohm, < g="20"> 80 dB, (>90dBA) G = 20, > 60 dB, (>70 dBA) G = 200
- Sensitivity : > 100 mV, G=20, > 10 mV, G=200
- Input Z : ~ 10 k ohm.
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