Quick Start Siren (CB25765E)

We found this circuit in the October 1994 Electronics Now magazine. The CMOS IC is uncommon these days and the output is low power.

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Switch with Diodes (CB19925E)
This configuration for switching signals uses only common general-purpose diodes such as 1N4148. The...
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This version works in the opposite way to the previous one, activating when the light falls on the...