DTMF Decoder (CB25048E)

This circuit was found in the 1987 Radio Electronics magazine. The components used are integrated circuits of the time.

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Complementary multivibrator (CB23644E)
This oscillator circuit with two transistors is from a 1965 documentation. The circuit is of the...
Triggered sawtooth generator (CB7599E)
This circuit was obtained in an old documentation, but it is still current by the used components....
Guitar Sustain Unit (CB14949E)
This guitar effect pedal was found in 1982 documentation. The circuit can be easily assembled with...