This circuit was originally suggested by General Electric in 1966 documentation to power decorative high voltage neon lamps. The transformer is 7,500 V for a current of 4 mA.
With this circuit it is possible to measure RF signals with a common multimeter. Signals up to 200...
Also suitable for use as a noisy alarm, this Morse Code or telegraph practice oscillator was found...
We show in the figure how to implement a current monitor circuit using only an operational...