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Higher supply voltage
http://www.diyaudioprojects.com/Forum/viewtopic.php?f=10&t=6660
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Author:  Rog63 [ 15 Nov 2019, 02:25 ]
Post subject:  Higher supply voltage

Hi

I have a 22v 2A wall wart from an old laptop. Would it be best just use a volatge di ider to drop the supply voltage or can the headphone amp be adjusted to run at 22v. How woulx the higher voltage affect the performance and sound. Will be used with Grado S60's.

Author:  gofar99 [ 15 Nov 2019, 21:38 ]
Post subject:  Re: Higher supply voltage

What headphone amp?

Good listening
Bruce

Author:  Rog63 [ 16 Nov 2019, 01:55 ]
Post subject:  Re: Higher supply voltage

Sorry, I was looking at the NP-100v12 12AU7/IRF510 MOSFET amp

https://diyaudioprojects.com/Solid/12AU ... ematic.png

Author:  BowToEd [ 08 Dec 2019, 01:02 ]
Post subject:  Re: Higher supply voltage

I'd caution you against this. Running the 12AU7 filament at higher than 12v will burn out the tube in short order.

All is not lost. If you regulate the voltage so that the filament only sees 12v, then the output will be happier if the rest of the circuit sees a higher voltage. The tube will have more gain and headroom. The MOSFET will still be able to push the same signal, but will likely need some heat sinking because of the increased power burned in its die.

At the same time, you're still only driving a 32 ohm load with milliwatts of power. Unless your headphones are unusually power hungry, there's no reason to mess with this basic circuit unless you're unhappy with the sound.

Ed AE7TE

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