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Electronic circuits are represented by circuit diagrams, which use symbols to depict components like resistors, capacitors, and transistors. Input components, such as push-to-make switches ...
You can go to any wrecking yard and find hundreds of Bosch SPDT relays in European cars (I prefer the Bosch type because most will have the circuit diagram printed on the case), or you can pay $3. ...
CIT Relay & Switch’s UL/CUL-recognized VM3 snap-action switches offers a choice of a single-pole, single-throw (SPST) or single-pole, double-throw (SPDT) circuit.