Found in a 1968 EEE, this switch controls a high-power load from an audio signal. The current is determined by the type of SCR.
This low noise preamplifier has a gain of 19 dB in the 30 MHz band. The circuit is from the 80s....
The shock is 2.5mH for frequencies between 3 and 30MHz. C is 1nF, R is 47k and the transistor can...
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....