Temperature control (CB21275E)

This circuit was found in an Electronic Design from the 90's. It makes use of components from the time. Triac is according to the controlled load.

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Shutdown for exhausted battery (CB8387S)
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...
Binary counter with relays (CB23779E)
This circuit uses the flip-flops from the previous circuit to implement a 3-digit binary counter. The...
Magnetic Transducer Detector (CB15914E)
This circuit, suggested by Philips Components, uses as a base a voltage comparator of the type...