110 electronic alarm projects

110 electronic alarm projects

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Thus a continuous current of air is passed through the box 6 to .13 5V Figure 4.14 Reflection-type smoke alarm, bell output and past the face of the LDR. ... This reduction of the LDR resistance can be used to operate a simple alarm circuit.

Title:110 electronic alarm projects
Author:R. M. Marston
Publisher: - 1977


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