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I have the project of making a touch switch using the IRFZ44N MOSFET for making a small led glow and stop glowing when I touch the probes. I thought of using a relay if I have to make a bulb glow, by connecting to the plug directly. I searched on the internet and found that most projects used 5V relays. But is it a problem if I use a 12V relay, instead of a 5V relay?
(Please don't mind if the question sounds silly, I am new to electronics and electrical)
No. You cannot. You can, however, use a 5V relay instead of a 12V relay as long as you put the appropriate resistor in series with the relay coil (so that the relay coil sees the same voltage across it and thus current through it that it normally needs).
What you are going to need to do (other than getting a 5V relay) is to re-design your circuit to accommodate the 12V relay which, depending on the circuit could be very simple or could be involved. You basically replace the 5V supply with a 12V supply and this causes a cascade of changes for everything that relies on the 5V supply in one way or another.
No. you can't.Because you need a threshold voltage close to relay voltage to triggering it. Thanks.
