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Norbert Hahn
 
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(ScotFraser) wrote:

and I'd like to use
something more trustworthy than an electret, of which the better ones don't
accept more than 10V IME.

Well, the SM81 is an electret & it's pretty trustworthy, & it accepts more than


.... the specs say "Supply Voltage ... 11 to 52 V DC, 1.2 mA max.

HTH
Norbert