This circuit allows the use of an electret microphone with a 1.5 V source. We found it in the Encyclopedia of Electronic Circuits volume 5 from 1995.
The reference voltage determines the output voltage on this circuit which has a maximum current of 5 A....
This filter of two transistors has the cutoff frequency determined by the formulas next to the...
July 2017 - Ricoh's new 200mA R1524x voltage regulators are available from Mouser Electronics with...