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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Stepper Motor Control (CB11845E)
The circuit shown is intended for the control of stepper motors, producing a pulse sequence...
3 transistor radio (CB18405E)
This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V...
Clamp (CB20644E)
This operational clamping circuit was found in an American documentation from the 1980s. The...