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.
A fine adjustment of the output voltage of a power source is achieved with this circuit, which...
This circuit, suggested by National Semiconductor, decodes audio signals from stereo TV...
This circuit was found in a documentation for radio amateurs in 1974. It can be used to generate...