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Comms Blazer

Discussion in 'Sound, Music, and Intercom' started by Eboy87, Mar 13, 2008.

  1. Eboy87

    Eboy87 Well-Known Member

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    I'm looking for one of these, anyone know where to find one that doesn't cost an arm, a leg, and a first born child? DIY is perfectly acceptable too. System is Clear-Com, people are getting pissed that I'm not on comms while mixing, and can't see the call light.

    Yahoo just gave me a whole bunch of Chevy and telecom hits.
     
  2. soundlight

    soundlight Well-Known Member

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    I'll assume $150 is an arm and a leg (but not the kid) and post anyways:

    Production Intercom Blaon/4 is the cheapest one that I've found. All of the pro audio companies that I have actually done shows with use the Blazon/4 units (with gaff tape around half of it so that only the engineer can see the flash) and handsets.
     
  3. avkid

    avkid Not a New User Fight Leukemia

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  4. Andy_Leviss

    Andy_Leviss Active Member Premium Member

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    Check out the Com-Bit. It's an LED call light built into a right-angle XLR connector. Easy to mount wherever you need it, I tape it to my meter bridge. $25, and Paul offers, school and union discounts. Tell him I sent ya!
    Here's mine on my last steady mixing gig, you can just barely make it out (since it's not lit) above the rings in the script binder on my script tray:

    http://ducksecho.com/misc/celia_combit.jpg

    --A
     
  5. Eboy87

    Eboy87 Well-Known Member

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    Thanks for that link Andy, I may have to pick one up. Looks like it gets its own XLR com run, not a pass-through, correct? Either way it's perfect since I mainly need it for theatrical work.
     
  6. Eboy87

    Eboy87 Well-Known Member

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    With our beltpacks? Yes, since we have a loop through.
     
  7. Andy_Leviss

    Andy_Leviss Active Member Premium Member

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    As others noted, you can chain it off the beltpack or, if you prefer, just pop a Y-cable on it for a pass-through, since that's all the beltpack pass-through is doing anyway.

    --A
     
  8. avkid

    avkid Not a New User Fight Leukemia

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  9. Footer

    Footer Senior Team Senior Team Premium Member

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    I know they have coms built into consoles, has anyone built a large call light into one?
     
  10. porkchop

    porkchop Well-Known Member

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    There neat, but not $90 neat. I'm sure there's info on the pinout of the cable in the intercom system. I bet a little research, a spare connector, a $.05 resistor, a $5 LED, and a few solders would go a long way.
     
  11. Footer

    Footer Senior Team Senior Team Premium Member

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    Thats my thought as well, there really can't be all that much to it.
     
  12. avkid

    avkid Not a New User Fight Leukemia

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    I might just know a guy that can do something about that.
    I'll get back to you on that in a few months.
     
  13. Andy_Leviss

    Andy_Leviss Active Member Premium Member

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    Indeed. Call signal is just 30V DC superimposed on the audio line (pin 3), so I'll save you that part of the research :)

    (This is why a pin 2-3 short causes intermittent phantom call signals, since it's shorting the 24-30 VDC supply from pin 2 onto the audio line, which looks just like a call signal to the stations on the line.)

    But if you are going to go prebuilt, I still like the Com-bit better, I think the right-angle connector's a bit easier to mount, and at less than 1/3 the price, well, the math is pretty easy.

    --Andy
     
  14. porkchop

    porkchop Well-Known Member

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    So basicly go from pin three through an appropriate resistor (found easily at http://www.ledcalc.com to an LED of your choosing. Then to tie it all together, I assume pin 1 for a ground???? If so the most expensive part is the XLR connector (or maybe the LED if you want a really big one) and like 30 minutes of time. Easy enough project
     
  15. Andy_Leviss

    Andy_Leviss Active Member Premium Member

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    Yup, you're spot on. LED and resistor between pins 1 and 3, and away you go.

    Now, an extra credit project...can you sort out a way to wire it up with a flashing LED that flashes for a few pulses after the call button is released like some base stations do?
     
  16. porkchop

    porkchop Well-Known Member

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    Two diodes, two capacitors and remembering freshman year of school yes. I actually made an applicable circuit, if you really want it I could look it up.
     

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