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 simple test tells you whether a PNP or NPN transistor is OK. The signal is given by turning on...
Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of...
The purpose of this circuit is to 'produce a beam of infrared rays modulated at a frequency that...