[Hallicrafters] off-subject motor speed control

[rrkrr]

I did a quick search and found manufactured replacements that were not 
very expensive.  Might be worth a phone call to see if they know about 
your model.
http://www.electricscooterparts.com/speedcontrollers.html
(I'm not familiar with this business, and I do not endorse them.)

Bob K4ERR

Edward B Richards wrote:
> Good Morning Gang. I apologize for posting an off-subject post, but
> obviously I am going to do it anyway. There is such a mass of talent on
> these reflectors I don't know where else to go to get technical advise.
> Among my problems are bad knees , hips, and back. My doctor won't allow
> knee surgery because the anaesthetic would be risky for me with my heart
> trouble (CHF). I use an electric scooter to get around although I can
> walk short distances. Twice now, the controller for the scooter has
> failed. It is an older model and no longer made. They are hard to find
> and expensive when you do. The speed is controlled by twisting a handle
> grip, like a motorcycle. This goes to a controller that allows the
> current to flow to the motor. When the controller goes out the motor will
> not run. It is a 24 volt motor with 2 each 12 volt batteries in series. I
> don't know the motor current but the whole scooter is protected by a 15
> amp fuse that includes a couple of lights. I would say 15 amps to be
> safe. I am looking for someone who is able and willing to help me design
> a simple controller that I can build. I am thinking of a pass transistor
> controlled by a potentiometer. Maybe a DC amplifier in between. I don't
> know enough to do it by myself. Thank you.
>
> 73,   Ed Richards   K6UUZ
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