Phase Detector 7400 (CB22427E)

This circuit detects the phase of a signal. As it is a TTL circuit, it must be powered by a voltage of 5 V.

Moisture Detector (CB5367E)
We found this circuit in an 80's Radio Shack publication. The circuit uses a company buzzer, but...
Ultra sensitive RF relay (CB22291E)
This circuit is an improvement of the previous circuit. An input resistor must be included...
Ceramic Resonator Oscillator (CB15997E)
This circuit produces a signal at a frequency of 455 kHz, based on a ceramic resonator CSA455E, by...