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Relay DPDT v2

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Double pole double throw (DPDT) relay: an electrically controlled switch where current through the coil pulls in two sets of changeover contacts, which are electrically separate from the coil, so a small circuit can switch a separate, bigger load. A microcontroller pin can't drive the coil directly, so use a transistor, and put a diode across the coil to absorb the voltage spike when it turns off. Check the coil voltage (e.g. 5 V or 12 V) and the contact ratings. Learn how relays work

Electromagnetic switch

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Reference Character
K
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