I currently use a SPST switch to interrupt ground to the headlight on my motorcycle. I want to replace that with a switch that includes a LED to indicate it is on. The switch I have obtained is intended to switch the high side, but I want to switch the low side, as the switch I am using right now does.
I could use a NC relay, but I'd rather save space and power and go with an N channel MOSFET. How can I achieve the desired Normally Closed operation? I understand that Normally Open operation would be fairly simple to achieve, but I'd like the MOSFET to be powered only when the headlight is off. (Most of the time, the headlight will be lit. Ordinarily I only turn it off for starting the bike.)
Or should I just try to locate a small relay? Maybe I'm way off-base and I actually need a P channel device?
The current in this circuit will be less than 10 amps at 12vdc.
Thanks in advance for any assistance!
-Waldo
I could use a NC relay, but I'd rather save space and power and go with an N channel MOSFET. How can I achieve the desired Normally Closed operation? I understand that Normally Open operation would be fairly simple to achieve, but I'd like the MOSFET to be powered only when the headlight is off. (Most of the time, the headlight will be lit. Ordinarily I only turn it off for starting the bike.)
Or should I just try to locate a small relay? Maybe I'm way off-base and I actually need a P channel device?
The current in this circuit will be less than 10 amps at 12vdc.
Thanks in advance for any assistance!
-Waldo