Simple Power Supply

I need a design for a simple power supply to provide power to a DC motor for use in a constant tension device. Need the design to vary the voltage to the motor from a external pot that has an arm that rides on the spool I am unwinding. The power supply would need to provide about

2 amps max to run the motor at something like about 0 - 12 volts. The motor would provide tension on the spool that would vary as the size changed. If someone has another suggestion I would be open to that also. I looked at a device I found on the web from a company called Magnetic Tech. that uses a magnetic brake that probably would work however it is priced at almost $600/ unit. I have been using a mechanical brake that places drag on the spool however this is not constant tension and I have increased the speed of the unwinding and this has caused me alot of problems.

Thanks -

Barry

Reply to
Barry Criner
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Hi Guy's, I aggree with Ned re. the dancer. The simplest way to drive the 12v d.c. motor would be to connect a variac to the dancer & use the output to drive a transformer/rectifier for the motor. If you could find a plugpack (wallwart?) with a high enough current you would only need that & the variac. Hope this helps. Ian Sutherland, Oz.

Reply to
Ian Sutherland

I made a machine for respooling sapphire fiber. Mytake-off tension control was made with a standard shaded pole motor, a 12 volt DC power supply controlled with an LM317 voltage regulator connected to a dancer pot. The 120 VAC shaded pole motor acts as a very smooth viscous drag when supplied with a small amount of DC. Try it on a bench test. About as simple as you can get.

Earle Rich Mont Vernon, NH

Reply to
ERich10983

OK, I'll bite:

Is this a modern or a ballet dancer?

Yours,

Doug Goncz, Replikon Research, Seven Corners, VA Unpublished work Copyright 2003 Doug Goncz Fair use and Usenet distribution without restriction or fee Civil and criminal penalties for circumvention of any embedded encryption

Reply to
Doug Goncz

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