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Author Topic: 3wire batt bocx for AT943  (Read 16989 times)

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Offline fozzy

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Re: 3wire batt bocx for AT943
« Reply #60 on: July 13, 2006, 05:34:00 PM »
So I am working up a design for a new 3 wire BB for myself.

Woule it be possible to combine the left and right channels into a 4pin ta4f/b4m plug setup. 
Something like this,

Pin 1: +9v(R)
Pin 2: Yellow(R)
Pin 3: Yellow(L)
Pin 4: +9v(L)
housing: ground

Or am I totally off base here,


FT: AT853 hyper caps, I need white, have black pair

Rig:
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > V2 > 722

Playback 1: Audiophile 2496 > coax > Benchmark DAC1 > AKG 701
Playback 2: Audiophile 2496 > coax > Benchmark DAC1 > Audioquest Diamondback XLR > PS Audio HCA2 > Kimber 4pr >B&W 600S3
Playback office: Generic Pci coax > Lucid DAC9624 > AKG K240

Offline poorlyconditioned

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Re: 3wire batt bocx for AT943
« Reply #61 on: July 13, 2006, 05:43:48 PM »
Yep.  You can do that.

You could even do it with a 3-pin miniXLR, because you really only need one +9V terminal, not two.

So the four connections needed are:
+9V
ground
L audio
R audio

  Richard
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
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Offline fozzy

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Re: 3wire batt bocx for AT943
« Reply #62 on: July 13, 2006, 06:01:38 PM »
Yep.  You can do that.

You could even do it with a 3-pin miniXLR, because you really only need one +9V terminal, not two.

So the four connections needed are:
+9V
ground
L audio
R audio

  Richard


Cool, thats what i was thinking too.  I just talked myself out of it.

My over all plan.

trim 2 AT853 to have ~3" cable length

use a small potting box (.5" X .5" x .35") to wire the mics to a single minature starquad cable, a la the schoeps KCY cable. 

terminate the starquad into a ta3f.

Should be able to get this into a 2.25 x 1.5 x1.375 box. 
FT: AT853 hyper caps, I need white, have black pair

Rig:
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > V2 > 722

Playback 1: Audiophile 2496 > coax > Benchmark DAC1 > AKG 701
Playback 2: Audiophile 2496 > coax > Benchmark DAC1 > Audioquest Diamondback XLR > PS Audio HCA2 > Kimber 4pr >B&W 600S3
Playback office: Generic Pci coax > Lucid DAC9624 > AKG K240

Offline poorlyconditioned

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Re: 3wire batt bocx for AT943
« Reply #63 on: July 13, 2006, 06:23:33 PM »
Yep.  You can do that.

You could even do it with a 3-pin miniXLR, because you really only need one +9V terminal, not two.

So the four connections needed are:
+9V
ground
L audio
R audio

  Richard


Cool, thats what i was thinking too.  I just talked myself out of it.

My over all plan.

trim 2 AT853 to have ~3" cable length

use a small potting box (.5" X .5" x .35") to wire the mics to a single minature starquad cable, a la the schoeps KCY cable. 

terminate the starquad into a ta3f.

Should be able to get this into a 2.25 x 1.5 x1.375 box. 

Hey, if you (or anyone else ...) get any leftover cable I could use it for my various "active" projects.

Thanks (to anyone...)

  Richard
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **

Offline fozzy

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Re: 3wire batt bocx for AT943
« Reply #64 on: July 13, 2006, 06:30:35 PM »
Looking at 1% tolerance Metal film resistors.  What chemisrty of capacitor is the best for the BB purpose?
FT: AT853 hyper caps, I need white, have black pair

Rig:
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > V2 > 722

Playback 1: Audiophile 2496 > coax > Benchmark DAC1 > AKG 701
Playback 2: Audiophile 2496 > coax > Benchmark DAC1 > Audioquest Diamondback XLR > PS Audio HCA2 > Kimber 4pr >B&W 600S3
Playback office: Generic Pci coax > Lucid DAC9624 > AKG K240

Offline poorlyconditioned

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Re: 3wire batt bocx for AT943
« Reply #65 on: July 13, 2006, 07:48:59 PM »
Looking at 1% tolerance Metal film resistors.  What chemisrty of capacitor is the best for the BB purpose?

I use metal film or polyester caps.  You can use electrolytic too, just get the polarity right.

  Richard
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **

Offline aberg

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Re: 3wire batt bocx for AT943
« Reply #66 on: July 13, 2006, 09:32:03 PM »
Wow, those pics of the 3wire BB that you designed look sweet... 943s into that plus an iRiver would be uber stealthy...

how much are you asking for those dano?

Offline fozzy

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Re: 3wire batt bocx for AT943
« Reply #67 on: July 14, 2006, 07:37:52 PM »
got my design mostly figured out, but still need 1 more recomenddation

Looking for a mini toggle switch, threaded w/ nuts (5pc set), All the ones on Digikey are 4-7 dollars which seems high to me
FT: AT853 hyper caps, I need white, have black pair

Rig:
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > V2 > 722

Playback 1: Audiophile 2496 > coax > Benchmark DAC1 > AKG 701
Playback 2: Audiophile 2496 > coax > Benchmark DAC1 > Audioquest Diamondback XLR > PS Audio HCA2 > Kimber 4pr >B&W 600S3
Playback office: Generic Pci coax > Lucid DAC9624 > AKG K240

Offline poorlyconditioned

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Re: 3wire batt bocx for AT943
« Reply #68 on: July 14, 2006, 08:21:00 PM »
got my design mostly figured out, but still need 1 more recomenddation

Looking for a mini toggle switch, threaded w/ nuts (5pc set), All the ones on Digikey are 4-7 dollars which seems high to me

Hey, why don't you build it without a switch.  Ie., it is an open circuit until you plug the mics in.  I would only use a switch if I wanted: 1) a lowcut/highpass filter, 2) to hardware with mics to avoid connectors.

Please post photos once you build it.

  Richard
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **

Offline fozzy

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Re: 3wire batt bocx for AT943
« Reply #69 on: July 14, 2006, 08:25:57 PM »
got my design mostly figured out, but still need 1 more recomenddation

Looking for a mini toggle switch, threaded w/ nuts (5pc set), All the ones on Digikey are 4-7 dollars which seems high to me

Hey, why don't you build it without a switch.  Ie., it is an open circuit until you plug the mics in.  I would only use a switch if I wanted: 1) a lowcut/highpass filter, 2) to hardware with mics to avoid connectors.

Please post photos once you build it.

  Richard


makes sense
So with the 3wire pdf posted earlier in the thread i see it is an open circuit, I won't have to worry about it being on till I plug in the mics.  cool
having the output hardwired won't "turn it on"?
FT: AT853 hyper caps, I need white, have black pair

Rig:
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > V2 > 722

Playback 1: Audiophile 2496 > coax > Benchmark DAC1 > AKG 701
Playback 2: Audiophile 2496 > coax > Benchmark DAC1 > Audioquest Diamondback XLR > PS Audio HCA2 > Kimber 4pr >B&W 600S3
Playback office: Generic Pci coax > Lucid DAC9624 > AKG K240

Offline poorlyconditioned

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Re: 3wire batt bocx for AT943
« Reply #70 on: July 14, 2006, 08:29:08 PM »
got my design mostly figured out, but still need 1 more recomenddation

Looking for a mini toggle switch, threaded w/ nuts (5pc set), All the ones on Digikey are 4-7 dollars which seems high to me

Hey, why don't you build it without a switch.  Ie., it is an open circuit until you plug the mics in.  I would only use a switch if I wanted: 1) a lowcut/highpass filter, 2) to hardware with mics to avoid connectors.

Please post photos once you build it.

  Richard

makes sense
So with the 3wire pdf posted earlier in the thread i see it is an open circuit, I won't have to worry about it being on till I plug in the mics.  cool
That's right.

Quote
having the output hardwired won't "turn it on"?
Right.  The *output* will not turn it on, it is the input (the mics).
I say "hardwired" meaning the mics are soldered instead of connecting with miniXLR or other.  In this case you'll need a way to turn it *off* when not in use.  You can do this with a switch, or my favourite, a sliding battery tray.  Just slide in the battery to use the mics.

  Richard
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **

Offline TideBleach

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Re: 3wire batt bocx for AT943
« Reply #71 on: July 16, 2006, 04:48:02 PM »
would i need a preamp to go with a pair of sp-at853's and the 3 wire box going into an iriver h120 line in? or would the at853's and the 3 wire box still make it loud enough? anyone have this combo with out a preamp? how much gain do you use from your h120 at a loud show?

thanks tidebleach

Offline hyperplane

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Re: 3wire batt bocx for AT943
« Reply #72 on: July 16, 2006, 05:59:26 PM »
would i need a preamp to go with a pair of sp-at853's and the 3 wire box going into an iriver h120 line in? or would the at853's and the 3 wire box still make it loud enough? anyone have this combo with out a preamp? how much gain do you use from your h120 at a loud show?

thanks tidebleach

Obviously, the term "loud" is subjective. At a local club, with a decently 'loud' PA, I used that exact setup (AT853 > 3wire bbox > iriver LINE In) and had the iriver gain set at between +13 to +17 dB of gain, and my peaks were hitting at -3dB on the latter setting (of +17dB of gain). If I were running the two wire version at that same show, I would estimate only using maybe +5 dB to +8 dB of gain on the iriver.

Also, with my AT831s, it seems like the mic output diminished by a solid 12 dB or so (during the pre-3wire modification time period).

Offline TideBleach

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Re: 3wire batt bocx for AT943
« Reply #73 on: July 16, 2006, 06:19:40 PM »
thanks thats exactly what i wanted to know  :) i just wanted to make sure it wasn't going to make me add so much gain that it would use digital gain. when i said loud i meant to say was, would the signal still be hot enough to just use analog gain on the irver h120.

thanks for your help

tidebleach   :)

Offline whatboutbob

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Re: 3wire batt bocx for AT943
« Reply #74 on: July 16, 2006, 06:27:25 PM »
Obviously, the term "loud" is subjective. At a local club, with a decently 'loud' PA, I used that exact setup (AT853 > 3wire bbox > iriver LINE In) and had the iriver gain set at between +13 to +17 dB of gain, and my peaks were hitting at -3dB on the latter setting (of +17dB of gain). If I were running the two wire version at that same show, I would estimate only using maybe +5 dB to +8 dB of gain on the iriver.

I use about the same settings.  Acoustic sets would require ~+30 gain...which is when the iriver pre starts to get a bit sketchy to my ears.
Mics: Audix m1290's, AT943's (w/ AT853 C/O/H caps), AT853's
Power: PS-2, Homebrew 3wbb, SPSB-6
Pre/AD: UA-5 (BM2p+), CA-9100, AD-20
Recorder: iriver H120, H160

 

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