mstechca
New Member
I bought some LM317LZ voltage regulators.
I think that the output voltage and the input voltage have a constant ratio defined by the user. That is, if I had a 9V supply and I want the regulator to output 3V, then if the battery is 1/2 dead, the input is 4.5V and the output is 1.5V.
What I want to do is be able to fix the voltage to 3V just for the receiver. I need the extra voltage to drive the LED output of the receiver because 3V doesn't give out much light for an LED, and I don't have ridiculously small value resistors to even out the current.
If there is a circuit that allows me to force the output of the regulator to 3V from any input voltage source above 3V (9V at most), then I would like to see it.
I think that the output voltage and the input voltage have a constant ratio defined by the user. That is, if I had a 9V supply and I want the regulator to output 3V, then if the battery is 1/2 dead, the input is 4.5V and the output is 1.5V.
What I want to do is be able to fix the voltage to 3V just for the receiver. I need the extra voltage to drive the LED output of the receiver because 3V doesn't give out much light for an LED, and I don't have ridiculously small value resistors to even out the current.
If there is a circuit that allows me to force the output of the regulator to 3V from any input voltage source above 3V (9V at most), then I would like to see it.