More Bench-Tested Circuits

Larsen's latest is packed with fun, inexpensive and brilliantly simple designs, each with a detailed schematic. There's an incendiary method of destroying inaccessible taps and bugs, circuits for detecting phone line cuts and usage, designs for undetectable phone taps, ways to use off-the-shelf components to remotely control a bug or phone tap, some low-power-drain circuits for marking hidden caches and much more! For academic study only.

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More Bench-Tested Circuits Link 1
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More Bench-Tested Circuits Link 2