T1 steps down AC voltage from 115VAC (or 220VAC) to about 8VAC and is then rectified via bridge rectifier BR1 to about 11.52Vdc. C1 filters off the AC ripple. If you find the circuit output too noisy add another electrolytic capacitor over the output terminals. Value can be between 10 and 100uF/25V. The output voltage is variable with the 10K-potentiometer while keeping the current constant.
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***power supply kit
Read More Source by Tony van Roon
http://www.uoguelph.ca/~antoon/circ/minidril.htm
Thank you.
This entry was posted on Wednesday, March 26th, 2008 at 8:14 am and is filed under Electronic Control, motor speed controller, Power supply.
