This circuit is from a 90s Popular Electronics. It consists of a power source for bass amplifiers of common types at the time that used symmetrical power and separating filters.
This circuit is designed to trigger a xenon lamp from a switch. The circuit was found in the May...
This radio version with a transistor for a crystal phone was found in a Japanese magazine from...
This filter rejects the hum of 60 Hz from power grid, being placed between the signal source and...