We found this circuit at Popular Electronics. The components are still current. Changes can be made to obtain higher voltages, as indicated in the second diagram.
This original 70s RCA circuit appears elsewhere on this site, including original RCA...
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...