Night switch (CB8280E)

Found in a 1964 Philips manual, this circuit uses only passive components. The relay is a high voltage sensitive type.

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White Noise Generator (CB17603E)
This circuit appears at various points in this section and on this site, with minor variations. It uses the...
Wireless Guitar (CB25579E)
This sophisticated transmitter was found in the June 1993 issue of Electronics Now magazine. The...
3-level triac shield (CB7856E)
Found in a 90s Electronic Design, this circuit can be used as a shield in current projects. The...