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| R1 C1,C2 C3 C4 C5 C6 U1 | : 39K 1/4 watt : 10 uF 25v : 100 uF 25v : 47 uF 25v : 0.1 uF 25v : 2200 uF 25v : TDA1554 |
- The circuit works best with 4 ohm speakers, but 8 ohm units will do.
- The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed.
- The circuit operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat.
- Printed circuit board is preferred, but universal solder or perf board will do. Keep lead length short.
LM386 Audio Amplifier
This simple amplifier shows the LM386 in a high-gain configuration . For a maximum gain of only 20, leave out the 10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be realized by adding a selected resistor in series with the same 10 uF capacitor. The 10k potentiometer will give the amplifier a variable gain from zero up to the maximum.
lm 3876/lm 3886 50 Watt Audio Amplifier
The 10 Ohm and 2.7 Ohm resistors must be 1 Watt types, and all others should be 1% metal film. All electrolytic capacitors should be rated at 50V if at all possible, and the 100nF (0.1uF) caps for the supplies should be as close as possible to the IC to prevent oscillation.
The supply voltage should be about +/- 35 Volts at full load, which will let this little guy provide a maximum of 56 Watts. To enable maximum power, it is important to get the lowest possible case to heatsink thermal resistance.
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