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Old 9th September 2006, 05:13 AM   #1
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Default Help with "Interface Electronics" portable audio mixer

I purchased an "Interface Electronics" audio mixer from a local ham fest last year. It came in a flight case but had no power supply or manuals. The man i purchased it from told me how to use it with any 48v power supply. I took it home and fired it up, and to my surprise the sound quality was not only good, it was amazing! I tried researching this company so i could pick up a service manual and at least get some specs on it. The board has a very distinguished sound....a good cross between API and Neve.
All boards fit into a PCI looking slot that runs along the bottom, connecting all boards. I decided to be an idiot one day and start pulling out boards to look at them...when the power was on. It has 8 similar boards for the individual 8 inputs, then an oscillator board and finally the main board with meters and master controls. I pulled out this board and then reset it in the slot...only to short it out and cause it to smoke. I found that i fried the first resistor in line after the connection to the power supply, only i burned it so badly that i cannot read what value it was to replace it. I had to blow up the one board that there is only one of. Any one have any idea of where i can find a schematic for this puppy? I have taken it to a local pro audio repair guy who found the resistance value but says there are other things wrong with it as he is finding DC all along the op amps implying a short. This is not a very expensive board but means a lot to me and my sound, any help would be greatly appreciated, if you would like to see a picture of the unit, please contact me and i'll be glad to send it to you. Thanks all!
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Old 9th September 2006, 09:21 PM   #2
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anyone?
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Old 26th November 2008, 09:41 PM   #3
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Default Interface Electronics (Stevenson)

Deleted at the request of the user.

Last edited by Jason; 25th February 2010 at 09:57 PM.
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Old 25th September 2009, 11:05 AM   #4
mfratus is offline mfratus  United States
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Default Interface Electronics 8x2 mixer with 200C, 12 and 200MLM modules

I have the same unit. I'm working on it now, but don't have a schematic. If you tell me where the resistor is, I'll tell you what value this one has.
What I need is a schematic for the channels or some idea what the bus structure is. I guess I could scope it. But I want to tweak the EQ a little.
Anyone have any idea of the channel design?

Mike.
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Old 30th June 2010, 11:27 PM   #5
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Mike,

Wow, this is a late reply but I'm hoping you still roam this forum. Let me get a picture of the place where the resistor was and I'll post it on here as soon as i can. If you could, could you also take some pictures of your unit as I think the person who owned mine modified it and I'd like to see what yours looks like to see how stock it is. Thanks for the reply, hope to hear back from you soon.

Joe
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Old 30th June 2010, 11:48 PM   #6
mfratus is offline mfratus  United States
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Default Resistor

Sorry, that unit is long gone. Seems there were a few resistors on the meter board, and they were about 5-10 watts.
I finally found some schematics online. You might try again with a Google search.
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Old 1st July 2010, 06:35 PM   #7
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The 48 V in question, may well be the phantom power the the mixer provides through the mic input connectors to the microphones.
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Old 6th July 2010, 12:33 AM   #8
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This particular mixer only has 1 power input and that's for 48V which powers the whole mixer. I guess there are some voltage dividers in there somewhere.

When you said there were some schematics online, are they for this particular unit? If so what were your search terms?
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Old 1st April 2011, 06:34 AM   #9
n0ukf is offline n0ukf  United States
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I just got a series 100 8x4 mixer at a hamfest too.
If yours is a series 100 mixer, you can find a link to schematic pages at Tape Op Message Board. Go to their New Members announcement thread first to get the password to access the schematics.
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