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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Touch switch (CB9562E)
This sensitive touch key appears on this website from other sources. This version was taken from a...
Nonlinear Gain Amplifier (CB6130E)
This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used...
LED strobe CIR11912S (CB19565E)
CMOS 4046 (PLL) is not very common. In this circuit it generates short pulses to excite a high...