This schematic shows a security device, apparently intended for military uses. The inputs are 3 contacts ( normally closed) on furthest left side with the middle one being common ground(?). It mentioned they are for break wire. The outputs are sound via a simple transformer oscillator , light and optionally a pyrotechnics sound maker. I am just interested to know how the circuit works. It says start by pushing switch B1 and B2, but then this action will short circuit the battery B ( if I am correct).
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