Friday, December 15, 2017

Tricaster Tally Light Interface

                Upon receiving our Tricaster 855 we realized that it does not provide the typical contact closure tally light output that most video camera CCUs (Camera Control Unit) accept. Rather Tricasters output a positive 3.3v when the particular tally light is to be lit. To circumvent this problem we built a small box that consists of the following: (one for each tally light needed) 5VDC Reed Relay and a 1N4004 diode (or similar). So basically the 3.3v powers the relay and causes the contact closure for the CCU. Then put the diode in reverse direction over the + and - pin on the relay coil to dissipate any energy from the collapsing magnetic field at deactivation. This will prevent any damage to the Tricaster's circuitry.tally1tally2

Comments   

0 #5 Dave 2014-02-19 11:48
Has anyone tried using an ssr instead of building the reed relay switch?

Thanks
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0 #4 Kumaran 2014-01-18 01:36
How would you connect the output of the relay to the CCU, for panasonic. Is it a direct XLR connection. Please do explain that part a little more
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0 #3 Angel 2013-04-10 16:15
Thanks for your valuable information. I'll post our results.

Thanks again for sharing.

Greetings from Orlando, FL
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+1 #2 Cliff 2013-04-10 14:38
Quoting Angel:
We noticed the same issue in our Tri 855. I think that your suggestion is what we need in our system to provide dry contatcts to our CCU's. Question: the diode will be connected in parallel to the relay coil? Is the cathode connected to the + comming from Tri 855?

Thanks


I added some photos I have been wanting to post too. The diode goes across the relay coil and yes the cathode is on the + from the tricaster. We have 2 JVCs and 3 Panasonic PTZ cameras that's why the photo is a little different. Hope that helps, I'm not an electrical engineer and make not guarantees! I just do a little bit of everything!
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0 #1 Angel 2013-04-10 10:54
We noticed the same issue in our Tri 855. I think that your suggestion is what we need in our system to provide dry contatcts to our CCU's. Question: the diode will be connected in parallel to the relay coil? Is the cathode connected to the + comming from Tri 855?

Thanks
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