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Hacking a Perfectone motor


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#1 Tom Chabbat

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Posted 23 January 2016 - 10:10 AM

Hello Eclair fans,

 

I have a little question that may sound stupid... I have on my NPR a Perfectone crystal controlled motor but with a single speed of 25 fps, and I wondered if it was possible to "hack" it to add 24 fps...

I know this motor was made in a multi speed version (like this one), and I'd be curious to know how different are the electronics from one version to another. Maybe we could compare the motors with someone who have the multi speed one or even the fixed 24 fps version ?

 

What do you think ?


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#2 Freya Black

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Posted 23 January 2016 - 12:15 PM

If you are good with a soldering iron, it's just a matter of adding more crystals and the switching but you need to be quite confident of course. I'm planning to mod my ACL motor in the same way.

 

In fact if you just want 24 then it's just a matter of swapping out the crystals although you might want to check that there are not already both crystals in there because you might just need to switch something...

 

Freya


Edited by Freya Black, 23 January 2016 - 12:15 PM.

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#3 Freya Black

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Posted 23 January 2016 - 12:21 PM

Here are some instructions for an ACL motor (the CP modified one):

 

http://eclair16.com/...-motor-to-ntsc/


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#4 Tom Chabbat

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Posted 23 January 2016 - 12:40 PM

Wow thanks, it seems almost too simple ! I'm going to check if the same crystal frequency is used for 25fps in the Perfectone motor as in the ACL. Would love to hear how your mod goes too.


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#5 Tom Chabbat

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Posted 24 January 2016 - 11:04 AM

Ok so maybe it was a little too easy at first sight !

 

The Perfectone crystal is sadly nothing like the ACL. At first I couldn't find it. I was looking for the metal enclosure crystal like the one on the ACL or any electronic circuit i'm used of. Then I wondered about the vacuum tube I found... Could it be it ? A quick internet search confirmed that some quartz crystal can be found in vacuum tube enclosures. But the one I have is wrapped into some old foam, so I can't say for sure yet. The foam is held tight against the tube by two soldered wires, and as I'd have to remove them to access the tube, I thought it'd be wiser to ask some advice here first before doing anything stupid. Here's what it looks like :

 

GHb1ei.png

 

The tube has 7 pins, I wonder if messing with those could easily alter the frequency...

 

QuOWHG.png

 

On the back of this board, you can see written : "base de temps quartz 20900" (time base in english). Seems to be the frequency, but it's not specified wether it could be 20.9 kHz or mHz (seeing similar vintage crystals, I'd say the former).

 

DA5rTi.png

 

Anyway I fear finding a matching crystal for 24 fps (something like 20,064 kHz) will be next to impossible with this kind of obsolete electronics. But seeing how big is the crystal tube, I doubt very much there was two of them in the 24/25 version, so there must be another way around ?

Any insight ?


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