Double door bell (CB7559E)

Found in an Elektor from the 90's, this double door-bell drive circuit switches a relay by triggering different points.

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Neon sawtooth (CB8940E)
This circuit was obtained from an old Signalite documentation. Neon lamps are special types of the...
Tape Playback Amplifier (CB4761E)
This circuit can be used with older tape player systems to recover media converting for digital...
110 V to 12 VDC Converter (CB8674E)
Found in an EEE from 1970, this circuit supplies a voltage of 12 V DC x 10 mA current from the...