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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SCR contactor (CB9262E)
This circuit for controlling high power in the AC network was found in a Motorola documentation from 1968....
Solid State Relay Shield (CB9161E)
Found in American documentation from the 90's, this circuit consists of a solid state relay with...
Hartley Oscillator for Code (CB26327E)
This oscillator uses a small transistor amplifier or radio output transformer. We found it in a...