Originally designed to trigger a printer with a delay, this circuit can be used for other purposes. The circuit is from a Radio Electronics from September 1984.
This complementary transistor stage was found in a 1968 publication. The transistors are germanium types and...
Found in 80's Radio Electronics, this circuit uses an LED to indicate that a battery is being...
Found in Popular Electronics from 1969, this circuit uses a neon lamp from the time that had...