567 Tone Decoder (CB25787E)

We found this circuit in the December 1994 Electronics Now magazine. The worthless components are frequency dependent.

| Clique na imagem para ampliar |

Zener and SCR Oscillator (CB22095E)
This interesting oscillator was obtained from an old documentation. In principle any 106 series SCR...
Fourth Order Low Pass Filter (CB14925E)
This filter, with a cut-off frequency of approximately 1 kHz, has a high Q and employs two...
Current Controlled Oscillator (CB23635E)
This circuit is from a Radio Electronics from February 1964. The circuit uses period transistors and is...