Electronics > Beginners
Cheap microphone - simple amp circuit
Teledog:
Perhaps lightly off topic,
This arrived today;
https://www.ebay.ca/itm/DC-3-7V-6V-MIC-AMP-MAX9812L-TDA1308-Stereo-Microphone-Headphone-Amplifier-Module/112487497429?hash=item1a30c6fed5:g:azAAAOSwvDpa2wAS
Used a high end noise cancelling electret mic (Polycom surplus), and yes, there is a DC bias on the mic input.
~5-6VDC batteries works best, added a 100uF electrolytic & a 0.1 cap at the DC input (USB chargers all have 60hz hum, good Li batt charger packs have little/no noise)
For the price, easy-peasy, plug & play.
Cranked up, you will hurt your ears with earbuds,.. if someone even burps in the near vicinity.
my 2 cents...
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