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Author Topic: 3wire batt bocx for AT943  (Read 32623 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,


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

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

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).
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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?
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > 722

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).
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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?

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

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).
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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"?
MK 4V > KCY 250/5 Ig (KS 10I)  > VST62IUg > 722

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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).
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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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