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Old 27th January 2004, 03:39 PM   #1
penance is offline penance  United Kingdom
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Default Need schematic for 9v DC PSU

HI

I need a psu to power a 9V DC motor, this is the motor supplied by Scheu with thier TT. It has a small PLL circuit already in the motor case, so i think i just need a good stable 9V supply.
This is also an exercise for me so i dont mind going a bit OTT.

cheers
Andy
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Old 27th January 2004, 03:57 PM   #2
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a 9 volt battery would be the best way to get it going.....and a simple LM7809 regulator from national would be easy to build

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Old 27th January 2004, 05:03 PM   #3
markp is offline markp  United States
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Default Re: Need schematic for 9v DC PSU

Quote:
Originally posted by penance
HI

I need a psu to power a 9V DC motor, this is the motor supplied by Scheu with thier TT. It has a small PLL circuit already in the motor case, so i think i just need a good stable 9V supply.
This is also an exercise for me so i dont mind going a bit OTT.

cheers
Andy
Use a large 12volt lead acid battery as your voltage source before the regulator. Charge it up once every month or so and you will be set with a noiseless voltage source that is easy to regulate with a simple LM7809 or better. Put a large cap after the regulator.
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Old 27th January 2004, 05:16 PM   #4
penance is offline penance  United Kingdom
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cheers

I hadnt considered batteries
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Old 27th January 2004, 05:25 PM   #5
maylar is offline maylar  United States
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I imagine that the "wall wart" battery elimunators at Radio Shack might do the trick too.
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Old 27th January 2004, 08:12 PM   #6
markp is offline markp  United States
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Quote:
Originally posted by maylar
I imagine that the "wall wart" battery elimunators at Radio Shack might do the trick too.
Nope, the idea is the constant smooth voltage delivered by a battery. The eliminator would total destroy the purpose of the whole idea.

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