VHF and UHF Preamplifier (CB8401E)

Found in a 90s Popular Electronics, this circuit uses a MAR-X to amplify signals up to 2 GHz. The circuit is quite critical.

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Overtemperature Alarm (CB10486E)
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...
Three Phase AC Motor Control (CB12953E)
In the figure we have a three-phase AC motor control for voltages up to 600 V or 1200 V depending on...
Delayed Switch Using Triac (CB12242E)
We found this circuit in a 1980 publication. It can be applied to Triacs of the TIC series and the...