A ring and pendulum of stripped wires form the sensor for this alarm. Once triggered, to reset, you need to press S for a moment. The relay is of the sensitive type of 6 or 12 V, depending on the supply, remembering that in the SCR there is a drop of approximately 2 V, in full conduction. Thus, in the case of a 6 V relay, it will be interesting to supply the circuit with at least 8 V. The SCR does not require a heat radiator.
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