The sensors in this circuit that triggers when the temperature goes out of a certain range are common diodes. The circuit is from the 1991 Reista Electronics Experimenter's Handbook.
This experimental good sensibility radio was obtained from a 1968 magazine. The magazine no longer...
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an...