Timed Alarm (CB6423E)

We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is not pressed to reset.

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RF Modulator (CB5361E)
This circuit is from an ancient American documentation. The coil is frequency dependent and the...
Magnetic Microphone Preamplifier (CB25694E)
This circuit was found in the March 1994 issue of Electronics Now magazine. The circuit uses a...
Brake light and direction indicator (CB7106E)
This circuit was found in a Popular Electronics from the 90s applying to common automotive...