Recording light

Discussion in 'TASCAM DM-3200 & DM-4800' started by Headroom, Jan 26, 2013.

  1. Headroom

    Headroom Active Member

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    Hi eveybody,

    I wonder if I can get the punchlight:
    http://www.punchlight.com/?q=recording_lamp_usb
    to work with my DM4800+Cubase.
    Maybe through the GPI, or USB on my PC?
    Or does anyone know a better solution for a recording light?

    Gr
    Frans
  2. Arjan P

    Arjan P Well-Known Member

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    Interesting, I'm looking for a recording light myself. From the site, it seems that the USB Punchlight operates directly from the PC or Mac software, including Cubase.
  3. captdan

    captdan Well-Known Member

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    I get the same impression. It looks like it's driven by the DAW transport via USB.

    Should work fine.

    Me likey! :)

    CaptDan
  4. Jarno

    Jarno Member

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    Indeed! That's the way Punchlight products work.

    If you have very basic electronics skills, it should be trivial task to design and build your own recording light controlled by DM's GPI port.
  5. captdan

    captdan Well-Known Member

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  6. Headroom

    Headroom Active Member

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    I happen to have a degree in electronics :oops: but I guess I'm just lazy. Still need a suitable lamp if I make the circuitry myself. That's how I found the punchlight, that seems to be all-in-one.
    Helios here in Holland has several nice recording lights:
    https://www.helios-online.nl/shop/20-173/on-air-lampen
    The ones with text are not what I'm looking for, since I want the light to be visible from both the studio and the control room.
  7. junomat

    junomat New Member

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    This is awesome.

    Slightly different topic...

    Is there a way to have the talkback button trigger an external light? I constantly have band members in the control room talking about the musician in the studio and if they could see a more obvious light it might help with band dynamics.b :D

    Thanks.
    Last edited by a moderator: Jan 23, 2014
  8. Jarno

    Jarno Member

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    There is, but it's not as easy one as a recording light, because GPI doesn't support talkback button. And it requires some internal modification on your DM: You'll have to design a circuit which senses a voltage across the talkback LED and then illuminates your light. A simple job for someone with electronics knowledge, but not recommended for anyone who has to ask if it's possible.
  9. Arjan P

    Arjan P Well-Known Member

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    Jarno is right, that's a sure way to make it work. Another possibility is via the footswitch - but it requires you to use the footswitch for talkback operation. The switching action can be used to input a flip-flop circuit outside the DM to operate a light. You probably need similar electronic skills, but don't have to touch the DM's insides this way..
  10. Headroom

    Headroom Active Member

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    OK I did it for 2,05 euros.
    The light is made of the cap of a car cockpit cleaner aerosol :) and some aluminum from the junk box. Power from a 9 Volts adapter, also from the junkbox. A few LEDs, one transistor and some resistors.

    Attached Files:

  11. junomat

    junomat New Member

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    what does that connect to and how is it triggered?
  12. Headroom

    Headroom Active Member

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    One side of the interface goes to the LEDs, the other goes to the DM's GPI connector. The output terminal (I use output 1) goes high on the Key Event: REC.
  13. Arjan P

    Arjan P Well-Known Member

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    Where in the DM documentation can the GPI pinout be found? I thought I had a separate pdf about it, but I either lost it or I remember wrong and it's in a different document altogether..
  14. Headroom

    Headroom Active Member

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    It's in the manual. Chapter 2, Utilities, GPI. Page 45/46 in mine (DM4800).
  15. Arjan P

    Arjan P Well-Known Member

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    Strange, it's not in the DM3200 manual. Only mentioned in the Miscellaneous I/O specifications, where it says Pin1 = GPI1, Pin2 = GPI2 etc. I'll try the 4800 manual and check for more info.
  16. Headroom

    Headroom Active Member

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    Pin 1-4: output 1-4
    Pin 5: GND
    Pin 6-9: output 5-8

    Gr
    Frans
  17. Arjan P

    Arjan P Well-Known Member

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    Thanks, that was mentioned in the Miscellaneous I/O section. But I see in the DM4800 manual there's explanation about the GPI screen and how to assign actions to the outputs. Something to explore...

    EDIT: Found it in the Supplemental Manual for the 1.60 firmware update. Apparently, GPI functionality was only added to the DM3200 in the 1.20 firmware version. Same info there as in the 4800 manual.
  18. Jarno

    Jarno Member

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    Great! That's exactly what I was talking about. And for 2,05€ :eek: ... quite a bargain!

    Would you please share the schematics? It's been something like 25 years since the last time I designed an electronic circuit (additional AUX sends to my old mixing console) and I'm sure I would burn a handful of transistors and LEDs before getting it right.

    BTW ... does anyone have electric specifications (voltage/max current) for the GPI connector?
  19. Arjan P

    Arjan P Well-Known Member

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    Manual says 5V output level, no current mentioned. Pulse times are 150 ms.
    BTW, Frans, I'd really appreciate your schematic too, if you're willing to share. Thanks!
  20. Jarno

    Jarno Member

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    Indeed it does ... hidden in one table caption:
    But still interested on current rating ... would it be possible to drive an array of LEDs without transistor (or some other kind of switch like relay)?