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 that appears in similar versions on this site was found in a Popular Electronics from the...
This circuit is based on the bistable configuration, but with the difference that the values of...
This circuit was found in a Popular Electronics from the 90's. The circuit has gained 10 to 20 dB...