LED beacon (CB21017E)

This circuit was taken from a popular 90's Electronics. The LDR is mounted next to the LED to feed back the circuit.

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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...