View Single Post
Old 2nd Oct 2019, 3:03 pm   #7
Join Date: May 2008
Location: Derby, UK.
Posts: 7,610
Default Re: Kodak Carousel slide-projector - remote-control?

If you use two separate non-locking SPCO switches for the focus motor, you will get the "shorting" action with both switches at rest anyway. (Pin 4 to common contact of one switch, pin 5 to common of other switch, positive supply to both NO contacts, negative to both NC contacts).

This will stop the motor quickly on release, and might give you better control if there is any tendency for it to overrun if the armature has much inertia. I don't think this is especially likely; the reduction drive will give it an easier time, but will also reduce the amount by which it will move under its own stored energy.

(That was also exactly how I wired up the volume control motor on my Seeburg ESL100 .....)
If I have seen further than others, it is because I was standing on a pile of failed experiments.
julie_m is offline