CMOS Siren (CB26157E)

Found in the 1991 Electronics Experimenter Handbook magazine, this circuit has good power and is recommended to be triggered by light.

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Light Interruption Pulse Generator (CB16057E)
This circuit is suggested by Texas Instruments and can be used on an assembly line to drive an...
Optocoupler Low Power Interface (CB15491E)
In the figure we have a interfacing circuit of TTL logic as CMOS logic using a 6N139 optical...
Series and parallel alarm (CB26225E)
This alarm with sensors in series and parallel was found in the 1995 Encyclopedia of Electronic...