Heterodyne Mixer (CB4291E)

This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.

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Sensitive Touch Switch (CB488)
A touch in this circuit turns-on the lamp or the relay. Power supply is according the lamp or...
Bilateral current source (CB7544E)
Found in a Popular Electronics from the 90's, this circuit uses integrated from that time, today...
Insulated Triac Shield (CB18659E)
This isolated shield for triac was found in old European documentation. The resistor R1, in fact,...