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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
That's not true, with the diode in place the maximum voltage will be the forward voltage of the diode.
The diode only has to be rated to the same voltage as the maximum power supply voltage.
Although it doesn't matter here, you can speed the turn off time by including a resistor of the same value as the coil's resistance in series with the diode. This helps to prolong the life of relays as the contacts will open faster and arc less.
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