Iawia
Member
I have a Texas Instr. voltage regulator (UA 7805). I am looking at the schematic but still am unclear on how to accomplish this.
My source is 18v Dc, and I want to drop it to 12v. Even if the voltage at the source drops down, I would like to keep the output at 12v. Is the schematic that I attached the correct way on going about it?
View attachment 61253
If I regulate the R2 I can acheive the 12v I want, but if I vary the voltage source higher or lower, my ouput changes. How can I keep it at a constant 12v from a variable source (~12-18v)?
My source is 18v Dc, and I want to drop it to 12v. Even if the voltage at the source drops down, I would like to keep the output at 12v. Is the schematic that I attached the correct way on going about it?
View attachment 61253
If I regulate the R2 I can acheive the 12v I want, but if I vary the voltage source higher or lower, my ouput changes. How can I keep it at a constant 12v from a variable source (~12-18v)?