This TTL heads or tails circuit was found in the July 1973 Radio Electronics magazine. The LEDs are types of the time. Note the symbolic representation of this component.
Programmable unijunction transistors are not commonly used components today. This Popular...
The sensor of this circuit is a common silicon diode and it directly drives a small cooler with a...
This microamplifier was found in a Popular Electronics from June 1968. It is an experimental...