This is the traditional configuration of a standard lamp with a rectifier. Only incandescent lamp can be used and for the rectified version a 5 W lamp.
This oscillator was found in the November 1986 issue of Radio Electronics magazine. The frequency...
This sophisticated circuit with a low, medium, and high treble filter is from 1990 documentation. The...
This circuit was obtained from a 1998s Popular Electronics. The magazine no longer exists, but the...