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Author
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Topic: HERE AGAIN: A new crystal sync control for GS1200
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Renzo Dal Bo
Film Handler
Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016
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posted October 05, 2018 12:15 PM
"Renzo's Box" is coming ...
I wish to present in this forum, who saw its birth, the first batch of this completely new conception crystal sync control for Elmo GS1200, based on a microprocessor.
After a period of deep positive tests, on request of some members of this forum, I decided to build some of these boxes.
Briefly its main characteristics:
"Renzo's box" is capable to generate sync pulses, to feed the ESS socket of the GS1200 projector, in way that the projector speed remains absolutely constant, following the timing pulses.
It works with five selectable speeds: 16.667 - 18 - 23.976 - 24 - 25 fps.
But on request I could insert, for example, the 19.980 speed instead of 16.667 fps. This is useful to made a NTSC telecine without flickering, of a film originally shoot at 18 fps and projected with a three blades GS1200 projector.
The pulses accuracy is very high: it is under +/- 0.5 microsecond ( +/- 0.5 millionth of a second). So that the maximum error is about 1 frame every 2 hours at 16.667 fps speed and 1 frame every hour at 25 fps speed.
The pulses' start and stop are controlled by hand with a switch.
The box can be powered both by a 9V battery or by an external 9V power supply.
For those who don't know what can be done with your GS1200 and a sync crystal control like the Renzo's box:
1) - The first obvious thing is to mantain the projection speed absolutely constant also at different speeds regarding to those originally provided (18/24 fps).
2) - To project a S8 film in sync with an external sound source (eg. from DVD, BR, VHS, ...) with better quality than allowed by the original sound recorded on the film track.
3) - To re-record or dub the sound track of a S8 film in sync with an external sound source already seen above.
4) - To made a telecine in sync with a video camera without flickering (both PAL or NTSC)
Here are some photos of the already built boxes.
In a few days I think to sell some Renzo's boxes in this forum, but first I wish to know how many members, other than those who already contacted me, are seriously interested about it. I'm not a dealer but only a passionate, just like the majority of you. Knowing the number of possible interested people, will help me to fix a reasonable price, main based on craft hours. So please who interested could send me a PM.
Thanks to everyone, in particular to those who made it possible for this project to exist.
Renzo
Take a look at this thread for more information about the development of this project:
http://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=011864
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Renzo Dal Bo
Film Handler
Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016
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posted October 19, 2018 03:20 PM
Hi Jim,
No secret here!
As I wrote in my first post on this thread, I asked to everyone who was seriously interested about my box to send me a PM, and I replied to all of them.
I was very surprised to the number of people who contacted me, more than the four items I had already built.
I am not a dealer and I build this sync box in my spare time, on request, more for the pleasure of helping other fans of our hobby than to speculate.
For the first batch I asked a special low price of 100 Euro + shipping cost.
This price doesn't cover all the project expences, so I asked to add a voluntary non-mandatory contribution to support the project and which gave the right to receive first the boxes I had already built. I promised to the others who confirmed with a order I will build the remaining "Renzo's Boxes" as soon as possible. I think within 30/40 days.
I would like the forum members, who will receive soon the first batch's boxes, leave here a feedback.
If someone else wants to participate in the game, under the same conditions, I have nothing against it. Just contact me by PM.
Renzo
[ October 20, 2018, 03:59 AM: Message edited by: Renzo Dal Bo ]
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Renzo Dal Bo
Film Handler
Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016
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posted November 23, 2018 04:34 AM
First my thanks to Bill and Maurizio who ever supported, encouraged and helped me to reach the final result to realize the Renzo's sync Box.
For those who asked if I plan to build a similar solution for other projectors like Bauer 610, I'm sorry, I say definitely NO.
First because I never owned a Bauer 610, and because you probably don't know how much time one wastes to carry out such kind of projects with all risks connected to modify the projector's electronics. Deep modifications moreover left to the ability of the final user. For your curiosity here is what Pedro provided regarding the Bauer projectors.
A board to insert inside the projector with all the connections to solder to the existing electronics.
At the end these modifications made the projector compatible with one of the external P1008 units (sold separately).
With a total minimum cost of about 500 Euros (ten years ago!) to satisfy your desires. I'd really like to know how many people bought them at that time.
Answering to Alan, sincerely I don't know.
Regarding the GS1200 units made for EU countries (240V/50Hz) and used in the USA (120V/60Hz) with appropriate transformers, you currently set the speed selector to 18 fps to obtain about 22 fps increased to 24 by the speed regulation knob. In normal conditions, with my box, to reach the NTSC standard 23.976 fps, it is necessary set the speed selector to 24 fps and then to rotate the "Pulse Level" knob so that the indicator needle stays firmly in the middle. With your GS1200 you should verify if the range of regulation of that knob allows you to do the same. If you want, I could send you a box for doing a test. After that you can decide to keep or return the box only paying for transport costs. If you agree send me a PM.
At the moment what I can concretely undertake is to extend the use of my box to crystal sync the Braun Visacustic projectors provided with the external control unit.
[ November 23, 2018, 07:08 AM: Message edited by: Renzo Dal Bo ]
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Renzo Dal Bo
Film Handler
Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016
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posted April 19, 2019 04:38 AM
Many thanks to all friends who left a positive feedback of my sync box for Elmo GS 1200 and I hope it met the expectations for all the others, too.
As I let it be understood in my previous post, now I am proud to announce I am able to build a similar sync box for Braun Visacustic projectors, and, if someone is interested in, I could relate about it in another specific thread.
Regarding the possibility to build a similar solution, especially aimed at Bauer projectors, I have been too pessimistic saying "definitely NO".
"Never say never" would have been better to say, because the Phoenix rebirth now it's not so far. However to make this happens I need to find someone who made the change on his Bauer projector according to Pedro's instructions, mounting inside the projector the board you can see in the last photo I previously posted.
Is there in this forum someone who can help me?
Renzo
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