Hi everyone,
I'm trying to build one of these things:
https://www.instructables.com/files/orig/FX5/67GS/FLROK12R/FX567GSFLROK12R.gif
LED vu meter, taking it's input from a microphone.
The LM3916 part is working just fine, but I've having problems with the LM386 - the output on pin 5 hardly varies from around 3.7v
I've tried stripping it down to a very basic amp, as shown in the attachment. If I place the mic an inch from my mouth and hum loudly, I can just about get a swing of 0.4v
Have I just got a really lousy mic, or is there something wrong with my circuit? With that capacitor over pins 1 and 8, I should be seeing a gain of around 200, right?
I'm trying to build one of these things:
https://www.instructables.com/files/orig/FX5/67GS/FLROK12R/FX567GSFLROK12R.gif
LED vu meter, taking it's input from a microphone.
The LM3916 part is working just fine, but I've having problems with the LM386 - the output on pin 5 hardly varies from around 3.7v
I've tried stripping it down to a very basic amp, as shown in the attachment. If I place the mic an inch from my mouth and hum loudly, I can just about get a swing of 0.4v
Have I just got a really lousy mic, or is there something wrong with my circuit? With that capacitor over pins 1 and 8, I should be seeing a gain of around 200, right?