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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Two-Band Radio (CB16394E)
This circuit in a receiver that allows the capture of distant stations with short waves. The...
3V to 5V Converter (CB4823E)
This circuit is from a Maxim manual and can be used to power shields from batteries. The circuit...
Basic Regulator from 1.2 to 17 V (CB15430E)
In this block we have a configuration of the most common ones in which some additional elements, which...