This circuit was obtained from Popular Electronics from June 1978. It doubles the input DC voltage. Obtained current is very low, serving only for polarization circuits.
This circuit was found in an old American publication. The integrated circuit used is no longer easy...
Active with the output at the high level, this oscillator was found in November 1984 Radio...
This simple receiver with junction FET uses a high impedance magnetic earphone (over 2 k). Power...