Hi Charles,

Your regulators should probably be able to do the job.  The symptom, 
"doesn't work" covers an enormous range of possibilities, but I'll take a 
wild shot at it.  National recommends a capacitor from each regulator's 
output terminal to ground, located near the IC.  They suggest a 1uf 
tantalum, or alternatively a 25uf aluminum electrolytic.  That's probably 
needed to prevent oscillation and it will also help keep the regulator's 
output impedance down at high frequencies.

If that's not it, get out a DC-coupled oscilloscope and I can give you some 
other suggestions of what to look for.

If it were my circuit, I'd first sit down and make very sure that what I'd 
wired up matched my schematic.  That usually fixes about 80% of the 
circuits I work on.

Regards,
Brett

At 01:44 PM 4/12/2006 -0500, you wrote:
>Hello Everyone,
>  I am a junior in college and last summer I build a
>seismograph for a school project.  The amplifier and filter
>work great together, but when I connect the power supply to
>the amp. and filter the system doesn't work.  At the end of
>this email I have provided the URL's for the schematics of
>the amplifier, filter, and the power supply.
>  Currently, the amplifier and filter are using a quad
>power, power supply, but I would like to build my own power
>supply.  My question is, Does anyone know of any power
>supply schematics that would work with my amplifier and
>filter?
>
>
>Amplifier and Filter:
>  http://users.viawest.net/~aloomis/seisfilt.htm
>
>Power supply:
>http://users.viawest.net/~aloomis/seisprea.htm
>
>Sincerely,
>
>
>Charles Staniger
>President, Carthage College Habitat for Humanity Chapter


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