8mm Forum: Eumig Speed control fitting?

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Topic: Eumig Speed control fitting?

Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted January 28, 2009 05:22 AM

Is it possible to fit a speed control to the motor on these machines? I like my 810 & 824 but would love to control the running speed manually. Has anyone done this?

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Martin Jones
Phenomenal Film Handler

Posts: 1269
From: Thetford , Norfolk,England
Registered: May 2008

posted January 28, 2009 08:34 AM

From my experience, a "Craven Syncrodeck" type circuit will control the speed of a motor in an 824.... but I'm not very knowledgeable with regard to the circuitry involved. All I know is that mine works; I usded to use it to control speed to avoid flicker when transferring to video tape.

Martin

--------------------
Retired TV Service Engineer
Ongoing interest in Telecine....

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Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted January 28, 2009 09:27 AM

Thanks Martin, all I need to do now is find out what a Syncrodeck curcuit is, can't find anything on the web, I have a rheostat but not sure how to connect it to control the motor.

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Martin Jones
Phenomenal Film Handler

Posts: 1269
From: Thetford , Norfolk,England
Registered: May 2008

posted January 28, 2009 10:26 AM

The "Craven Syncrodek" was a system produced in the 70's(?) for "synchronising" the speed of a projector to perforated magnetic tape. The idea was that pulses from the tape perforations were compared with pulses from the shutter shaft of the projector and the difference controlled the projector motor speed by varying the motor current. This was done by switching a solid state device rather than a using a rheostat; perhaps someone out there has more detailed knowledge of this?
A rheostat should work, but you will have to experiment with ohmic value and power rating of the rheostat required for your actual machine. Simply cut one of the motor wires (or disconnect at the transformer) and wire it in series.

martin

--------------------
Retired TV Service Engineer
Ongoing interest in Telecine....

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Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted January 28, 2009 11:52 AM

Thanks Martin, I will try it.

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