This preamplifier for phonographic capsules using FET was found in 90s American documentation. Consumption is very low. The power can be obtained from the amplifier circuit with which it works.
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
Found in the July 1968 Supertena Bulletin of a Popular Electronics, this receiver makes use of the...
This common metronome configuration has already appeared in several of our articles and projects. This...