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Author Topic: 5V DC to 6V DC  (Read 6913 times)

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dhansen

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5V DC to 6V DC
« on: November 16, 2003, 03:02:03 am »
Hello,

Wasn't there a separate audio forum earlier today?  When did these get combined?  

Anyway, I have hacked a amplifier out of an old set of PC speakers and I was wondering if I could power this off the 5v of my switching power supply.  The amp origianaly took a 6V power supply, but I was wondering if the 1V would make any difference.

Thanks!
Doug
..as his cold lifeless fingers lie motionless on the garage floor, all he could hear in his head was...I JUST WANTED TO PLAY A GAME OF DONKEY KONG!!

OSCAR

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Re:5V DC to 6V DC
« Reply #1 on: November 16, 2003, 10:05:19 am »
Yes, you can do this since it is only an amplification circuit.  About the worse that can happen is the amp will be a little quieter, but probably not enough to notice.

In a similar vein, Williams sound boards require +12V & -12V from the power supply for the amp (24V), but if you use a newer arcade switching power supply, you only have +12, +5, and -5V per the jamma standard.  In this case, I wire the -5V to the -12V input to the sound board, and it still works fine.  It just won't as loud as it would with -12V.


saint

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Re:5V DC to 6V DC
« Reply #2 on: November 16, 2003, 11:58:48 am »
I just can't leave well enough alone :)

Hello,

Wasn't there a separate audio forum earlier today?  When did these get combined?  

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dhansen

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Re:5V DC to 6V DC
« Reply #3 on: November 16, 2003, 02:49:50 pm »
I just can't leave well enough alone :)

Hello,

Wasn't there a separate audio forum earlier today?  When did these get combined?  



Ahhhh, I thought I was going nucking futz!  Thanks Oscar, I should have listened during the electronics chapter in science.  :-[

Doug
..as his cold lifeless fingers lie motionless on the garage floor, all he could hear in his head was...I JUST WANTED TO PLAY A GAME OF DONKEY KONG!!

dhansen

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Re:5V DC to 6V DC
« Reply #4 on: November 18, 2003, 12:21:27 pm »
Hmmm this didn't work too well.  I hooked up the power to ground and +5v 1A on the switching power supply and the red light on the amp lit up but it dimmed when I plugged the audio jack into the PC.  What would cause this?  Anyway, I just ended up using the transformer that came with it.  

My power strip is wired to 4 plugs are on a switch and two are constant power so all the lights, sound, and monitor come on with one switch.  The PC's bios is set so I can power it up from the control panel with a couple clicks of a button.

Doug
..as his cold lifeless fingers lie motionless on the garage floor, all he could hear in his head was...I JUST WANTED TO PLAY A GAME OF DONKEY KONG!!

CitznFish

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Re:5V DC to 6V DC
« Reply #5 on: November 21, 2003, 08:42:57 pm »
I just can't leave well enough alone :)

Hello,

Wasn't there a separate audio forum earlier today?  When did these get combined?  


Good Grief Carlie Saint!    ;)

Macros

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Re:5V DC to 6V DC
« Reply #6 on: December 03, 2003, 02:11:31 pm »
Hi,

I have a similar situation except I need to go from 12 volts to 9 volts to power my audio amp. The amp requires 9 volts .7 amps. I've tried feeding it 5 and 12 volts from my powersupply but it didn't like that much. Originally, I was using the ac adapter but it created a magnetic field causing my monitor to swim unless the refresh rate was exactly 60hz to coincide with the frequency of ac power.

I guess I'll have to order a voltage regulator like a LM2940T-9.0 from digi-key. It's $6 dollars for one but shipping will be $12, so I'll have to pad my order with some other stuff.

Macros


StephenH

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Re:5V DC to 6V DC
« Reply #7 on: December 17, 2003, 01:57:51 am »
You can probably get a replacement 6V adapter at Radio Shack, or an electronic supply store.

MrDT

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Re:5V DC to 6V DC
« Reply #8 on: January 14, 2004, 11:06:09 pm »
Hi,

I have a similar situation except I need to go from 12 volts to 9 volts to power my audio amp. The amp requires 9 volts .7 amps. I've tried feeding it 5 and 12 volts from my powersupply but it didn't like that much. Originally, I was using the ac adapter but it created a magnetic field causing my monitor to swim unless the refresh rate was exactly 60hz to coincide with the frequency of ac power.

I guess I'll have to order a voltage regulator like a LM2940T-9.0 from digi-key. It's $6 dollars for one but shipping will be $12, so I'll have to pad my order with some other stuff.

Macros



It might be worth trying it on 7 volts. The 7 volt trick was initially used by modders who wanted to quieten their fans, simple instructions on how to do this can be found here: http://www.cpemma.co.uk/7volt.html

I don't know if it'll work for you (due to me being too dumb to work out the current you'd get), but it might be worth a try before you go off and buy some stuff you might not need ;)
Case modder + mame fan = cab buildin' time ;)

Macros

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Re:5V DC to 6V DC
« Reply #9 on: January 15, 2004, 09:53:24 am »
I knew about the 7 volt trick but I was a little apprehensive about using it with the speaker amp's circuit. It's fine for something simple like power to a fan. I ended up buying parts locally to make up a circuit using a 7809 fixed voltage regulator. I bought enough parts to make 5 of these for less than $12.

It's a pretty simple thing to do, here is a schematic.