Both times, clearly yes. 0.5 mA is a typical current consumption.1)Should the Mic be powered in order to work or not??
2)With 10K resistor and 9V,the mic can only draw 1mA of current...is it enough for it to work??
Obviously, the schematic refers to an electrete microphone with built-in impedance converter, you won't hardly get other types on the market. I does not work without a power supply.The mic doesn't draw any current
Hi,
You'll have no problems connecting it to a 386. It will be fine. It will work with any 2-pin electret element.
It's not a hi-fi circuit (but a 386 really isn't hi-fi either), but certainly noise+distortion is reasonably low with this
preamp - so you could upgrade from the 386 if you really wanted to..
Of course, there are better circuits (and dedicated mic amps, for example with AGC if you needed it), but since you had a
single-transistor design in the first place, it should suit your needs.
Not necessarily. But increasing R1, R2 and R6 won't hurt.i think the mic amplifier should have higher impedance than the mic.. am i right ??
For C1, The reactance has to less than the input impedance at the lowest frequency of interest.
For C2, The reactance has to less than the input impedance of the following stage at the lowest frequency of interest.
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