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