But works LED missing

But works LED missing

TOOGOO (R) LM386 audio amplifier module 200 times 5-12V 10K variable resistor (Electronics)

Customer Review

Used the module to check whether the microphone capsule is working or not. But it serves its purpose. For me, however lacked the LED for power display. On D1 are just two solder points without the LED - not important for me.

Pins 1 and 8 are connected to a 10uF capacitor, which causes the gain of 200. Before the capacitor is still a 0 ohm resistor - did not know that there is something.
Pin 3 (+ input) is connected upstream of the 10K potentiometer.
Pin 7 (Bypass) depends on a 10uF capacitor to ground.
Pin 5 goes through a 10pF and 100 ohm resistor to ground and through the 100uF capacitor according Out.

Tip: If the power source is not enough niederomig it comes to hum (known as motorboating, because it acts like a motorboat sounds.). Then a large Elko (eg 220uF) must be connected in parallel to the power supply.

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