My source voltage is 22V. I need to connect this source to a 5V circuit. I need a resistor in between, but I've forgotten how to calculate this. Can anyone help please? Thanks!
I agree with @MrChips and would hasten to add that almost any other solution would be superior. We need to stamp out the notion that using a resistor for this purpose is a valid idea.My source voltage is 22V. I need to connect this source to a 5V circuit. I need a resistor in between, but I've forgotten how to calculate this. Can anyone help please? Thanks!
If it normally runs off a button cell, it must take a very low current. A linear regulator would be better. I'd suggest LP2951Thanks, everyone. I had no idea of the current. The circuit I'm trying to power is usually powered by a button cell, but can take an input that's higher without frying it. I've run it off 3 AA batteries just fine - but my new source is 22V (and again, I don't know at what current). My documentation, unfortunately, is scarce.
I didn't know there was any such thing as this buck converter, but that sounds like the ideal way to do this. Thanks again!