Sensitive Crowbar (CB5887E)

This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can be the TIC106 need not have a heatsink.

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Photodiode Amplifier II (CB1301E )
This other photodiode amplifier uses an operational amplifier in the non-inverting mode and in the...
Continuity Tester (CB256E)
Circuits and devices can be tested using the tester. The visual indication of the state of the...
Water Level Monitor and Control (CB6271E)
This circuit was found in an 80s Hands On Electronics. It senses the water level in a reservoir by...