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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8 Digit Password Coded Lock (CB17980E)
This circuit was found in a publication in 2002 and can be powered by voltages from 5 to 12 V. The...
100V Negative power supply (CB21182E)
This negative voltage source was found in a Popular Electronics from the 90's. The transformer has 120V...
Multivibrator with Controlled Active Cycle (CB15998E)
Two inverters of an integrated 4093 form this oscillator, in which the active cycle can be...