567 Tone Decoder (CB25787E)

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

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Mark generator (CB7526E)
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...
40W Voltage Inverter (CB25375E)
This powerful inverter provides a high-quality sine wave signal. I found it in a Radio Electronics issue...
Continuity Tester (CB256E)
Circuits and devices can be tested using the tester. The visual indication of the state of the...