Transistorized Bragraph (CB7009E)

This circuit was found in 80's Popular Electronics. The components used are common and the number of indication channels (LEDs) can be changed.

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Locked Triac Switch (CB12241E)
This circuit, which applies to configurations with triacs of the TIC series, was found in a...
Modulated siren 555 (CB8651E)
This configuration can be found elsewhere on this website and section. The circuit is from Popular...
Alarm with lock (CB8973E)
The basic component of this circuit is a general-purpose SCR. The voltage is according to the...