We found this preamplifier with 70 dB gain for microphones in American documentation from the 90's. Consumption is low and equivalent transistors can be used.
This is a circuit that should not be used for readers interested in a fair game. The circuit...
This circuit has a general-purpose transistor to compensate for the non-linearity of the generated...
This circuit was found the Optoelectronics Sourcebook by Texas Instruments. Any phototransistor...