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 uses a NAND port to convert rectangular signals from 50 kHz to 1 MHz into triangular...
The transistors in this circuit can be BD135 and BD136 for currents up to 500 mA. The circuit...
) This circuit was found in a 80’s Popular Electronics. It issues a warning signal with the signal...