This circuit is from a 1975 RCA tube manual. It appears elsewhere on the site. R5 depends on the voltage of the amplifier with which it is used and can be changed.
This circuit was found in a 90s Popular Electronics. The circuit uses components from that time,...
The circuit is a multivibrator version using two NPN general purpose transistor. This circuit can...
When the supply is established, the load only receives the supply some seconds later, a time that...