12V x 10A power supply (CB21775E)

This power supply is from a 1977 documentation. The transformers have 11 V secondary with 10 A.

Complex Sound Generator (CB16437E)
We found this circuit in a 1987 documentation, but it can still be easily assembled. Its output must...
Fire siren (CB21232E)
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
Simple Alarm with SCR (CB24114E)
Found elsewhere in this section, this circuit is from the April 1971 Radio Electronics magazine. Note...