- Sat Mar 28, 2015 1:16 pm
#180761
After looking at one of the example schematics for the LM386N audio preamp - on the output in there's a cap and resistor pulled down to ground then the electrolyic cap and speaker's 8 ohm helps filters out unwanted frequency noise. I was a bit confused on why there was a ceramic cap and a resistor being pulled down to ground - is that to smooth out the ac frequency signal?