Diode Ploarity over relay coils.
« on: November 10, 2019, 12:43:38 PM »
Hi,
This I can possibly almost answer myself but i want to be reassured im right,.
Im running relays with a negative supply. The safety diode should be facing the voltage source if run on a positive supply but should it be reversed when run on negative?
Thanks
/
Emil


Khron

Re: Diode Ploarity over relay coils.
« Reply #1 on: November 10, 2019, 01:54:46 PM »
The cathode ("band" end) should be facing the most positive voltage - in your case, i guess that would be ground?

The anode should be then facing the more negative voltage.

The other way around, the diode would be forward-biased, and flow a lot of current from ground to the negative rail (through the transistor that switches the relay on).
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