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Author Topic: GP DMIC-20 content  (Read 14255 times)

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Offline leegeddy

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GP DMIC-20 content
« on: November 17, 2004, 08:55:19 PM »
first thing you may want to do when the UPS man drops off a brand spanking new Graham-Patten DMIC-20 (48kHz version) is to.........

1. open the damn thing up and locate the Analog Devices SSM-2017 mic preamp IC.


2. replace them with the BurrBrown INA-217 mic preamp IC.


3. see how fast you can melt the AD SSM-2017 with a butane lighter. :D
sorry, no photos.

4. plug in a custom Canare BNC>Coax s/pdif cable


5. think of ways to bug ToddR for tips on Gain Pot mod.

6. feel bummed because i don't have another show coming up until end of December. :(

marc

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Offline Tim

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Re: GP DMIC-20 content
« Reply #1 on: November 17, 2004, 08:58:05 PM »
so how much do those Burr Brown chips cost?
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Offline leegeddy

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Re: GP DMIC-20 content
« Reply #2 on: November 17, 2004, 09:04:26 PM »
Quote from: Tim on November 17, 2004, 08:58:05 PM
so how much do those Burr Brown chips cost?

$0!! i got 10 samples from TI.com

marc
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Offline F.O.Bean

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Re: GP DMIC-20 content
« Reply #3 on: November 17, 2004, 09:08:57 PM »
nice, thats awesome, i have great 481>dmic tapes from back in the day, they sound great :)

i can only imagine how that sounds :)

fwiw, the gain pot mod doesnt look too difficult, you'll have it done in 30 minutes marc :)

you just need the good dual knobs i believe for some reason, hell, its been 2 years since i considered doing it
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Offline Tim

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Re: GP DMIC-20 content
« Reply #4 on: November 17, 2004, 09:09:25 PM »
that's just silly :P

nice work Marc... I'm consistently impressed by the quality of your work, that bnc cable is very nice.
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Offline F.O.Bean

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Re: GP DMIC-20 content
« Reply #5 on: November 17, 2004, 09:09:54 PM »
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Sound Devices MixPre-6 & MixPre-3

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Offline F.O.Bean

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Re: GP DMIC-20 content
« Reply #6 on: November 17, 2004, 09:11:14 PM »
also marc, those IC's just snap in right?

that looks hella easy
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Schoeps MK 4V & MK 41V ->
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Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
http://www.mediafire.com/folder/j9eu80jpuaubz/Recordings

Offline leegeddy

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Re: GP DMIC-20 content
« Reply #7 on: November 17, 2004, 09:18:42 PM »
Quote from: Bean on November 17, 2004, 09:11:14 PM
also marc, those IC's just snap in right?

that looks hella easy

yes. you can jiggy the old one loose and snugly pop the new ones in. 

thanks for the link!! he's got a much better pic of the SSM2017. the DIP sockets mounts are so easy to use.

thanks tim, much of the construction's basically done by the Canare's parts. great quality stuff for pro-use.



marc
« Last Edit: November 18, 2004, 02:29:17 AM by leegeddy »
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Offline Swampy

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Re: GP DMIC-20 content
« Reply #8 on: November 18, 2004, 03:03:04 PM »
I was thinking about selling my DMIC, because its just not warm enough for my tastes with the TLs. But this idea of replacing the pres is definitly interesting to me. Are these BurrBrown pres in anything else? Do you think it would be possable to warm this puppy up at all? Id appricate any info! Thanks!
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Offline leegeddy

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Re: GP DMIC-20 content
« Reply #9 on: November 18, 2004, 03:09:05 PM »
Quote from: Alex "Swampy" Herd on November 18, 2004, 03:03:04 PM
I was thinking about selling my DMIC, because its just not warm enough for my tastes with the TLs. But this idea of replacing the pres is definitly interesting to me. Are these BurrBrown pres in anything else? Do you think it would be possable to warm this puppy up at all? Id appricate any info! Thanks!

alex;

i've replaced the mic pre IC in my mv100s and the difference was noticeable (but not like night/day). it's cleaner, lower noise floor. it doesn't change the tone (warm, presence, transparent, etc.)  i would think that changing op amps along with other parts would achieve the overall coloration change of a preamp.

marc

ps. TL>BurrBrown mod DMIC-20 is exactly what i'll be running too :)

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Offline Swampy

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Re: GP DMIC-20 content
« Reply #10 on: November 18, 2004, 03:10:55 PM »
Hmmm... Ill be interested to hear what you think, to me its just has no balls ;) Maybe I should try the mod to just for the hell of it, doesnt look hard...
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Offline leegeddy

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Re: GP DMIC-20 content
« Reply #11 on: November 18, 2004, 03:13:35 PM »
Quote from: Alex "Swampy" Herd on November 18, 2004, 03:10:55 PM
Hmmm... Ill be interested to hear what you think, to me its just has no balls ;) Maybe I should try the mod to just for the hell of it, doesnt look hard...

i will certainly lyk. i'm hoping to tape STS9 in Dec with the setup.

yep. changing IC is a total breeze with those DIP sockets in place.

marc
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Offline Swampy

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Re: GP DMIC-20 content
« Reply #12 on: November 18, 2004, 03:15:45 PM »
very cool, Ill be interested to hear what you think. Where does one get thoes ICs?
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Offline Todd R

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Re: GP DMIC-20 content
« Reply #13 on: November 18, 2004, 03:42:26 PM »
Quote from: leegeddy on November 17, 2004, 08:55:19 PM
first thing you may want to do when the UPS man drops off a brand spanking new Graham-Patten DMIC-20 (48kHz version) is to.........

1. open the damn thing up and locate the Analog Devices SSM-2017 mic preamp IC.

2. replace them with the BurrBrown INA-217 mic preamp IC.

3. see how fast you can melt the AD SSM-2017 with a butane lighter. :D
sorry, no photos.

4. plug in a custom Canare BNC>Coax s/pdif cable

5. think of ways to bug ToddR for tips on Gain Pot mod.

6. feel bummed because i don't have another show coming up until end of December. :(

marc


Just for the record, the Todd R that does the gain mods on the DMic20 is not me -- different Todd R from the DC area.  I'm pretty sure he's on this board, but I don't know his handle.

Marc -- good to hear you've tried out the INA217s instead of the SSM2017s.  I always felt the MV100 and DMic20 that uses them were a bit harsh in the high end.  Did you ever notice this and do you think the INA217 replacement smoothes out the high end at all?
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Offline leegeddy

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Re: GP DMIC-20 content
« Reply #14 on: November 18, 2004, 03:44:07 PM »
Quote from: Alex "Swampy" Herd on November 18, 2004, 03:15:45 PM
very cool, Ill be interested to hear what you think. Where does one get thoes ICs?

here ya go.

http://www.ti.com/ goto Samples link.

INA217AIP

marc
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