This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of components of the era, but modern equivalents can be used.
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
This electronic car lock was found in a 1988 magazine. It uses a code key that must be activated to...
The diagram shows an AND gate implemented with an LM3900 transconductance operational. The circuit is...