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Discussion in 'Pickups & Electronics [BG]' started by Red Planet, Feb 20, 2014.
Anyone ever ran a SR preamp at 18 volts?
Might try this question on the EB forum.
I believe I once asked that very same question and was told that you can't.
I'm pretty sure that opamp is good for 36volts, but you'd have to check the electrolytic caps. You could easily replace them with 25volt caps if you know what you are doing.
If you are getting distortion or limited battery life, there may be some other problem with the circuit though, especially one that's 30 years old...
No problems just curious.
Anyone else know for sure/ever try it?
I don't think they even make opamps that cannot take 18 Volts.
There are many low voltage opamps available that cannot operate at 18V.
I have been using an LMC6064 in detector circuits for several years and its rated supply voltage is 4.5 15V. The LMC6064 is at least a 13 year old design.
Fine, I'll read the specific opamp off mine when I open it up next time.
I know that the original MM preamps used an LM4250 opamp which has a maximum supply voltage of +/-18V. So with a single ended supply you could run that opamp with 36V max as RobbieK stated above. But as RobbieK pointed out, the caps would need to be checked to see what their working voltage ratings are.
TBH, with an audio circuit that old, well it wouldn't hurt to replace the caps anyway...
I'm wondering where is the other battery is going to fit. It's not much room in the control cavity unless you cut out a space in the wood. The ones I built myself I run at 18 volts for more headroom. But I put them all in Stingray copy basses that I didn't mind chopping into the wood to make the other battery fit.