Miscellaneous security circuits
Chapters 2 to 7 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 of this book have each looked at a specific class or type of electronic security circuit. This concluding chapter looks at a miscellaneous collection of security circuits that can be used in the home or in commerce or industry, but which do not fit into any of the specific classes of circuit described in earlier chapters.
The circuits described in this chapter include ones that are activated by the presence of a liquid, steam, or gas, by sound, by the failure of AC power supplies, by the close or near proximity of a person or object, by a human touch, or by the breaking of an ultrasonic beam. The chapter also describes two simple ‘eavesdropping’ ...
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