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Hi Bill,
I recently fitted a curtis PWM 24v dc speed controller and an NPC robot motor to an old farallon dpv. The speed control potentiometer is operated by a control knob on a stainless steel shaft sealed and using 2 “o” rings. So far the machine has been used down to a depth > 100m. The only problem so far is the knob is stiff to operate at depth.
David Paget
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Thanks again for thinking of me Steve. But it wouldn't help it to stay dry even if it was inside my sub. My sub is a completely wetsub that I use scuba gear to operate. No dry cockpit in my boat. It wouldn't be practical for me to install it in a pod outside the sub when I need it in the cockpit. It's not locating the electronics that is the problem. I can and have found them at many sites. All kinds of circuit boards to operate a DC variable speed motor. Just none of them I have found thus far are already waterproof and pressureproof with an exposed to the water switch knob, handle or twistgrip. For my application I don't need a fancy circuit board. I am using between the voltage spectrum of 12 volts for half speed and 24 volts for full speed. Since a household rotary light dimmer switch is made to handle 115 volts, it will more than handle my max of 24 volts. So you see I don't need a circuit board. If I wanted to make the switch myself, it would be simplest and cheapest to just use the rotary dimmer switch and encase it in pvc and use a magnet to actuate it without using a circuit board for the switch at all. The problem is then installing the dimmer switch in pvc to water and pressure proof it and then to make a magnet actuate the shaft to the switch. I could probably do it by taking the time and trouble to experiment but it would just be so much easier to be able to buy one like I need. If I can find it. Bill Akins.
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