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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Triac Motor Control (CB1312E)
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This interesting AC / AC converter is only indicated for resistive loads and was obtained in a...
Amplified Microphone (CB16483E)
This circuit consists of an electret microphone amplifier powered by a 12 V voltage. A regulator is...