Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

| Clique na imagem para ampliar |

Noise Transmitter CIR6169S (CB4343E)
We found this circuit in a 1989 publication. Its purpose is to produce noise in the VHF or UHF...
Power Supply with Operational Amplifier 12 V x 500 m (CB1171E)
This circuit was found on a Radio Electronics of July 1984. It consists of a source with the 741...
5-Range Voltmeter with AC to DC Converter (CB25224E)
This digital instrument input circuit was found in the September 1989 issue of Radio Electronics...