Any small sound amplifier from 200mW to 1W can be used in this simple circuit. Or circuit of two 80s based on a trigger like 555.
With this circuit it is possible to measure RF signals with a common multimeter. Signals up to 200...
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The integrated circuit used...
We found this circuit in an old neon lamp application manual. The circuit stores a call. The...