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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Phase Shift Oscillator (CB24013E)
This 1 kHz oscillator was found in the February 1970 issue of Radio Electronics magazine. It uses...
Switching Regulator 5 V x 1.5 A 723 (CB14526E)
The 723 integrated circuit is manufactured by several semiconductor companies with different...
Preamplifier and Tone Generator (CB20004E)
This is a combined circuit of tone generator and preamplifier. We found it in a 1975...