5 to 200 seconds timer (CB21401E)

This circuit was found in a 1967 RCA documentation. The semiconductor components are from the time, and modern equivalents can be tried.

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Instrumentation amplifier (CB7031E)
Found in Datel's documentation from the 1980s, this circuit makes use of the company's operational...
Passive Bass and Treble Control (CB25826E)
We found this passive circuit in the February 1995 Electronics Now magazine. The circuit is...
200 Megohms Operational (CB13584E)
This circuit was obtained in a 1977 documentation. Two operational amplifiers 741 provide an input...