Alarm transmitter (CB21874E)

This circuit was found in an Australian publication from 1991. The circuit emits a tone as well as the picked up sound when triggered.

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Thermostat (CB24644E)
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This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
Flip Flop High Current (CB6619E)
Suggested by a 1968 Philips documentation this Eccles Jordan rocker as it was called can operate...