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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Fuzz effect (CB4871E)
This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549...
Equalizing Amplifier NAB (CB4946E)
Suitable for recovering tape recorded media from a common tape player mechanism, this circuit is...
Basic Flip-Flop Using the 4027 (CB150)
The basic circuit of a flip-flop for use as a frequency divider or one-bit memory is shown here....