Cheap and compact... AT853 as your only mics....

[setboy]

I have materials to build a few more and I could be enticed to make some.

i may want one PM sent

[poorlyconditioned]

The 3 wire version battery box based off of poorlyconditioned circuit diagram is complete.  It isn't too pretty on the inside but its nice on the outside.  Mics connect with minixlr's and have a 1/8" output. 

Pictures coming later tonight or tom.

Box #1 is going overseas to Humbug.
Box #2 stays with me.

I have materials to build a few more and I could be enticed to make some.

Dear Sanjay,

Please include pictures/details of your preamp as well.  I always like to see home made gear!

  Richard

[Sanjay]

The 3 wire version battery box based off of poorlyconditioned circuit diagram is complete.  It isn't too pretty on the inside but its nice on the outside.  Mics connect with minixlr's and have a 1/8" output. 

Pictures coming later tonight or tom.

Box #1 is going overseas to Humbug.
Box #2 stays with me.

I have materials to build a few more and I could be enticed to make some.

Dear Sanjay,

Please include pictures/details of your preamp as well.  I always like to see home made gear!

  Richard

Hey,

The preamp is not done yet, I can tell you its a variation of the two channel preamp found on the jenson transformers page. The difference between that and this is that with mine you variably trim the gain from 0-60 anywhere inbetween instead of stops.  In addition opamps I am experimenting with are: LM2904m, lm2902n, motorola mc33558pt.  Also I have several varieties of twin pot pentometers.

I can't spell for shit.

Its half done but now that the boxes are done im gonna wait a bit to continue, i've spent too mcuh time on the battery boxes alone.  Plus im curious as to how good the microtrack pre is, and if this will do anything better.

[lordbelial]

PM Sent on the boxes and the preamp! I'm dying in whishes to see your work!

[Sanjay]

Alrighty as promised pictures, This is of the battery box, preamp still under construction.  soldering those tiny things is a bitch, and my burnt hands can attest to it.  And secondly mini xlr shit is so expensive, its smaller than regulars why is it more!

ok here you all are.

[Sanjay]

in hindsight it looks so simple but man oh man it was hard to get right.

[lordbelial]

Alrighty as promised pictures, This is of the battery box, preamp still under construction.  soldering those tiny things is a bitch, and my burnt hands can attest to it.  And secondly mini xlr shit is so expensive, its smaller than regulars why is it more!

ok here you all are.

+T for the Battery Box.

I'm dying in wishes to see the Preamp!

[thunderbroom]

I'm going to try making this on the weekend.  Thanks for the information!

[Weazel]

let me know how it goes. im studying this schematic all evening. will this work on at-933s too?
i see the red wire  (+)  goes straight to the mic this won't fry it?
and is it possible to use female 3,5 socket?. if i count 1=ground to mic 2=+ to mic 3= yellow left mic 4= yellow right mic. and 3,5 socket only has 3 solder points. so i need xlr?

[thunderbroom]

Put a load resistor (say 22K or 27K) between yellow and shield for each mic (two resistors).

What will the difference be between the 22k and 27k resistor?  I can only find the 27k if I buy a 100 pack assortment of resistors.


That's the only thing I need to put this together.

Thanks for this great info!
Thanks!

[poorlyconditioned]

Put a load resistor (say 22K or 27K) between yellow and shield for each mic (two resistors).

What will the difference be between the 22k and 27k resistor?  I can only find the 27k if I buy a 100 pack assortment of resistors.


That's the only thing I need to put this together.

Thanks for this great info!
Thanks!

I think either 22K or 27K is fine.  I forget what I used in fact.  When you fire it up, measure the voltage across the 22/27K resistor.  It should be approx. 1/2 of the battery voltage.  But anything between 2 and 5 volts is probably OK.  You just need room for a large voltage swing, ie., no overloading.

Enjoy...

  Richard

[lordbelial]

Yesterday I built my first battery box. No roll off because I only had 2,2 uF capacitors at home, but they were electrolytic capacitors. Will they work?

I know tantalum capacitors works better with audio applications. Anyway I'm gonna buy some tantalum capacitors, desolder the electrolytic ones and solder the tantalum ones again.

I used 1% 10k resistors instead of 22k or 27k

[poorlyconditioned]

Yesterday I built my first battery box. No roll off because I only had 2,2 uF capacitors at home, but they were electrolytic capacitors. Will they work?

I know tantalum capacitors works better with audio applications. Anyway I'm gonna buy some tantalum capacitors, desolder the electrolytic ones and solder the tantalum ones again.

I used 1% 10k resistors instead of 22k or 27k

Did it work for you?  Note; do *not* use tantalum for audio.  Electrolytics are actually OK (watch the polarity), but you probably want polyester or metal film.  At least that is what the 'golden ear' people say

  Richard

[M]

What is the estimated battery life in one of these 3 wire batt boxes?

Thanks

[lordbelial]

Yesterday I built my first battery box. No roll off because I only had 2,2 uF capacitors at home, but they were electrolytic capacitors. Will they work?

I know tantalum capacitors works better with audio applications. Anyway I'm gonna buy some tantalum capacitors, desolder the electrolytic ones and solder the tantalum ones again.

I used 1% 10k resistors instead of 22k or 27k

Did it work for you?  Note; do *not* use tantalum for audio.  Electrolytics are actually OK (watch the polarity), but you probably want polyester or metal film.  At least that is what the 'golden ear' people say


  Richard

Well, I think it worked, but it was strange becasue between the resistor I measured different voltages. Aprox 2 V in one and 1,75 V in other. Both resistors are 10kohm 1%, so I don't know what can cause this difference between the two voltages.

At this point, I think i'm powering the channels different. I mean, I'm powering one channel with 2 volts (0.2 mA aprox) and the other one with 1,75 V (0.175 mA aprox).