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Inside an Arbra dynamite exploder. (With explosion and danger-cats.)

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I'm guessing from the way the rotational force changed on the hand-cranked dynamo that the two thyristors are being fired in sequence. The first one to attempt to fire the connected charges, and the second to shunt the capacitor via a resistor to turn both thyristors off and make the output safe on each firing cycle. This device is very pleasing in so many ways. It's a proper blasting unit and feels chunky and functional. It can handle between 1 and 100 detonators wired in series, and uses just under 1000V to ensure a high enough current flows to trigger...
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