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.
Suggested by Amperex in a 1968 documentation, this circuit is based on TAA370, an integrated circuit...
If you have a common analog multimeter, you can increase its input resistance in the measurement of...
This simple circuit for switching RF signals was found in an RF Design from the 90s. The circuit...