72Hz to 5kHz VCO (CB24868E)

This circuit was found in November 1984 Radio Electronics magazine. The frequency is given by C1 which can be changed to other ranges.

| Clique na imagem para ampliar |

Single crystal radio (CB22170E)
Found in English documentation from the 1980s, this circuit can use any germanium diode. The...
Light controlled oscillator (CB7527E)
This configuration, which requires a symmetrical power supply for the 741, can be implemented with other...
Code Switch (CB1354E)
This 3-digit code switch was obtained from an old American documentation. The capacitor is 470 uF...