Jobo CPE-2 and 3004 drum

[Kevin J. Kolosky]

Sorin Yes, but that power supply is hooked up to something inside that machine that tells it how long to run and tells a water heater how much to heat the water and all sorts of other stuff. In industry and commerce devices are hooked up to computers all of the time. Why doesn't this happen in the photography world? we are having to buy a new "computer" for every device we purchase. Kevin

[Schatzie Walton]

The problem with the JOBO CPE2 motor relates to the method JOBO uses to control the speed, not the motor per se. In position "1", approximately 12 volts are present on the motor windings and in position "2" 24 volts. In a motor, torque is proportional to current which is proportional to voltage.

To get more "torque" I have designed a circuit board (and installed one in my CPE2) which borrows from robotics to pulse 24 volts to the motor. If the pulses are on 50% of the time, the motor operates at 50% speed, but with much more torque! An "H-Bridge" is used to reverse the motor every 1 1/2 turns. Any one interested should email me directly.