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Author Topic: About relays?  (Read 3539 times)
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Manchester (England England)
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doens't matter the base is 5v, and the collector and emmiter are 12v ?
The transistor will stand this. In fact the emitter is at 0V not 12V.
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How do you mean that the 12v transistor is reversed?

Your drawing shows the collector connected to ground and the emitter connected to the relay contacts. This is reversed. The emitter must be connected to ground and the collector to the relay contacts. Emitter is the terminal with the arrow. Conventional current must flow from the positive supply, through the load (motor), through the emitter in the direction of the arrow, to ground.
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I think you need to see:-
http://www.thebox.myzen.co.uk/Workshop/Motors_1.html
and
http://www.thebox.myzen.co.uk/Workshop/Motors_2.html
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