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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DC Positive to Negative DC Converter (CB12956E)
We present a DC-DC converter circuit that can operate with input voltages from 2.4 V to 14 V and...
Sound Metronome (CB13509E)
We found this circuit in a 1977 Radio Shack brochure. Transistors can be the most modern BC548 for NPN...
TTL Debouncing Switch (CB1361E)
This circuit can be used as an input shield for microcontrollers or other TTL circuits. The power...