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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Monitor receiver (CIR21944E)
This receiver was found in a documentation by Gernsback from 1960. The circuit uses high impedance...
25 W DC to AC Converter (CB4464E)
This circuit has a fairly common configuration consisting of a counter phase oscillator. The power...
Audio bargraph (CB20913E)
Found in Electronics Now this circuit is indicated for operation at the output of audio...