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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: firmdragon on March 10, 2007, 08:25:59 PM

Title: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: firmdragon on March 10, 2007, 08:25:59 PM
hey guys,

i've decided my sound pro's battery box is too bulky and that i can do better in terms of space ( i also want to practice my soldering).  anyone got diagram for a batterybox that will power my dpas?

tia
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: ghellquist on March 11, 2007, 05:19:48 PM
If you find nothing else, the DAD6001 (converter for 48V phantom) circuit is on the DPA website. You could use this for inspiration. Beats me though what a battery box would contain.

(http://www.dpamicrophones.com/Images/DM02113.jpg)

Gunnar
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: firmdragon on March 12, 2007, 03:48:41 PM
i was looking around the net for 9v battery boxes.
there's one here:
http://forums.minidisc.org/index.php?showtopic=11254

i posted the schematics  below.  what do you guys think? will it be able to power the dpas sufficiently?






fc = 1 / (2 * Pi * R * C)
C = 1 / (2 * Pi * R * fc)

fc = cutoff / rolloff frequency in Hz
Pi = 3.1415927...
R = Input resistance in Ohm
C = capacitor value in F (Farad), 1 uF = 0.000001 F
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: dointhatrag on March 12, 2007, 04:30:42 PM
I spent the money on a coresound battery box (w/ high pass switch) for my 4061's I think for about 50 bucks.

It is very solid and noiseless. its about the size of 3 cricket lighters stacked up.

http://www.core-sound.com/bk/IMG11A.JPG (http://www.core-sound.com/bk/IMG11A.JPG)

(http://www.core-sound.com/bk/IMG11A.JPG)
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: headroom on March 16, 2007, 05:56:00 AM
Hi here this is official DPA 9 Volt schematic
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: firmdragon on March 16, 2007, 02:03:24 PM
Hi here this is official DPA 9 Volt schematic

oh bless you!  i'll try this out next week.

EDIT: so i made it and it seems to work. still haven't had a chance to use it in the field yet.  i'll update when i eventually do.
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: Chuck on March 27, 2007, 08:30:24 PM
If you find nothing else, the DAD6001 (converter for 48V phantom) circuit is on the DPA website. You could use this for inspiration. Beats me though what a battery box would contain.

(http://www.dpamicrophones.com/Images/DM02113.jpg)

Gunnar

Gunnar:

Is this all that is needed to power electrets with 48v phantom power?
Essentially droping 48v DC down to 9v DC?

I've been looking for a circuit like this for a while.

Chuck
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: ghellquist on March 28, 2007, 04:54:31 PM
I believe it should work with most simple mics. The zener will protect agains over-voltage and the fet in the mic will draw a certain amount of current dropping the the voltage even more. Just be very careful to install the zener the right way and do measure the open circuit voltage before connecting you mic. You might want to experiment a little with the exact resistor values depending on your mic.

Gunnar
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: firmdragon on April 13, 2007, 08:38:21 PM
so it took me a while to sucessfully test it out.  but here's some a pic of what it looks like and how it compares to a soundpro SP-SPSB-1.

edit:
I used a piece of veraboard and used a female mini-jack from an old soundcard.  the resistors and cap are all pretty common.  all held in togethor with hot glue.  in hindsight,  i should have used an old headphone male mini-jack instead of regular wire and that new gold jack.  the fact that the gold jack isn't a right angle plug also kinda sucks. also a some sort of housing for the battery probably wouldn't be a bad idea either.  one time between sets, i couldn't figure out why i wasn't getting levels, turned out the battery had become disconnected from the bb.

 questions, comments, suggestions? all welcomed. 
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: firmdragon on April 13, 2007, 08:44:35 PM
sample wav:  in front of an outdoor festival-sized PA.  seems to handle the bass/kick fine. so full setup was dpa 4061>diybb (i guess)>iriver ihp-140

Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: lordbelial on July 21, 2008, 07:09:02 AM
I build myself this official DPA bbox and taped Bruce Springsteen this weekend. I was under the stack, 5 or 6 meters high and i was positioned 10 meter in the rear part.
I found out that the overall volume was considerably low (-16db peak), I was wondering if the 100 K resistor to ground could be acting as attenuator of the signal @ output.

Gear used was: DPA4061 > Home made battery box (using the official 9V bbox for DPA) > Iriver IHP-104 (4GB CF Mod)

Any comment from the board technicians?
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: lordbelial on July 23, 2008, 12:15:42 PM
I found out that the overall volume was considerably low (-16db peak), I was wondering if the 100 K resistor to ground could be acting as attenuator of the signal @ output.

No, the extra load of that resistor is so small that it makes little difference.  You could try a larger value for the 10K resistor if you need more gain.  At some point you will degrade performance, but it's hard to say where without knowing more about the mic.  You won't break anything though, so it's worth a try.

OK. I think is not worth trying to modify the 10K resistor. Anyway, it fits my stack-taping needs.

Thanks for the suggestion anyway!
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: dabbler on February 17, 2015, 12:33:20 AM
Thanks for that schematic, I used it built my own BB for the low-power 4063.
I decided to use one of the DPA mic boxes my 4063s arrived in since it's a great shape size for me with plenty of space to store a 12" mini-mini cable when not in use.
All the parts in the DPA schematic + lots of electronics-grade silicone sealant for stability.

I probably won't even need it since the 4063 seems alright out of the M10 PiP, but I could pack this for days when I don't mind travelling a little heavier.
Edit: I forgot to note I'm using Blu-Tack to hold the 9V in place, so it's secure yet removable.
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: dabbler on October 29, 2015, 03:19:54 AM
I'm also using the official DPA circuit provided by headroom for DPA 4061 mics.
However, I'm wondering if it's really enough since some of my stack/stage lip recordings do exhibit a tiny amount of distortion (which could also be from the PA system itself, I couldn't tell wearing foam earplugs).
The maximum current draw of the DPA 406x series is 1.5 mA (3.5mA with DAD6001) according to Jarrod from DPA.

A 9V / 10K resistor would only give 0.9 mA; so maybe 4.7K is a better match (giving 1.91 mA)?
I've only made one comp several months ago with a 4.7K vs 10K side-by-side on otherwise identical rigs (DPA 4061 + M10) and the 4.7K recording was 1.5-2dB louder while keeping the 100K resistor.  The show wasn't very loud, so I didn't notice a quality difference at the loudest sections.

Btw, am I correct the 100K resistor is only for output attenuation and would not affect powering of the mic?
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: Len Moskowitz (Core Sound) on October 29, 2015, 05:03:36 AM
If you're hearing distortion, it's not from the DPAs.

Even 10k Ohm is marginal in protecting the capsule. With a fresh, so-called "9 Volt" battery (which can really measure as much as 9.6 Volts), you risk damaging the capsule.

With 4.7k you'll almost certainly eventually damage or destroy it.
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: dabbler on October 29, 2015, 05:39:31 AM
Actually, I've been hoping to switch to the EBL 9V Li-ions which are only 8.4V.
I would get a nice weight reduction, too.
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: jerryfreak on March 14, 2019, 04:10:17 AM
Hi here this is official DPA 9 Volt schematic
sorry to dig up old thread. does it matter which way cap goes in this schematic? firmdragon's sketch has the + facing the mics, DPA schematic doesnt specify. Also in headroom's post here:

https://taperssection.com/index.php?topic=94046.msg1397122#msg1397122

he suggests using a 470 uF 10V cap, which seems way different. what is the effect of changing the capacitance by so much?
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: jerryfreak on March 15, 2019, 04:50:41 AM
anybody know where to get female microdot panel connectors (or somethign small i could pot)

like this, but in the US

http://www.coax-connectors.com/products/connectors/10-32/54-385-b3-10-32-(microdot)-front-mount-bulkhead-jack-solder-post.aspx
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: jefflester on March 15, 2019, 05:41:24 AM
anybody know where to get female microdot panel connectors (or somethign small i could pot)

like this, but in the US

http://www.coax-connectors.com/products/connectors/10-32/54-385-b3-10-32-(microdot)-front-mount-bulkhead-jack-solder-post.aspx
Found this just by Googling, $112 apiece.
https://www.te.com/usa-en/product-1467936-1.html

Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: jerryfreak on March 15, 2019, 06:46:48 AM
i should have added affordable! i see a few stateside for $30-$50, and ones from china for $2. theres gotta be a middle ground
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: jerryfreak on April 16, 2019, 07:19:24 PM
If you're hearing distortion, it's not from the DPAs.

Even 10k Ohm is marginal in protecting the capsule. With a fresh, so-called "9 Volt" battery (which can really measure as much as 9.6 Volts), you risk damaging the capsule.

With 4.7k you'll almost certainly eventually damage or destroy it.

is it always wise to limit current to less than the capsule maximum? in this case is the capsule max current the max it will draw, or the max it should be allowed to draw?
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: spyder9 on April 21, 2019, 11:47:16 PM
Here's the battery box I use.  Works flawlessly with my DPA 4061's.  This BB is super tiny.

https://www.soundprofessionals.com/cgi-bin/gold/item/SP-SPSB-10
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: ilduclo on April 22, 2019, 07:46:56 AM
so it took me a while to sucessfully test it out.  but here's some a pic of what it looks like and how it compares to a soundpro SP-SPSB-1.

edit:
I used a piece of veraboard and used a female mini-jack from an old soundcard.  the resistors and cap are all pretty common.  all held in togethor with hot glue.  in hindsight,  i should have used an old headphone male mini-jack instead of regular wire and that new gold jack.  the fact that the gold jack isn't a right angle plug also kinda sucks. also a some sort of housing for the battery probably wouldn't be a bad idea either.  one time between sets, i couldn't figure out why i wasn't getting levels, turned out the battery had become disconnected from the bb.

 questions, comments, suggestions? all welcomed.

I think the sp 11 used to be quite similar in size...had the roll off switches, but was tiny and had a nice “ sled” that the 9v fit into.  They’re not making it any longer...
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: spyder9 on April 22, 2019, 04:05:28 PM

I think the sp 11 used to be quite similar in size...had the roll off switches, but was tiny and had a nice “ sled” that the 9v fit into. They’re not making it any longer...

Not true.  Sound Professionals still makes the SPSB-11.  However, its slightly bigger than the SPSB-10.   SP-10 is the way to go, imo.  Ultra tiny setup.

https://www.soundprofessionals.com/cgi-bin/gold/item/SP-SPSB-11
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: jerryfreak on April 23, 2019, 02:47:42 AM
Here's the battery box I use.  Works flawlessly with my DPA 4061's.  This BB is super tiny.

https://www.soundprofessionals.com/cgi-bin/gold/item/SP-SPSB-10
According to Len 12 V will kill your 406x in short order
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: ilduclo on April 23, 2019, 08:49:51 AM

I think the sp 11 used to be quite similar in size...had the roll off switches, but was tiny and had a nice “ sled” that the 9v fit into. They’re not making it any longer...

Not true.  Sound Professionals still makes the SPSB-11.  However, its slightly bigger than the SPSB-10.   SP-10 is the way to go, imo.  Ultra tiny setup.

https://www.soundprofessionals.com/cgi-bin/gold/item/SP-SPSB-11

Well, the 11 USED to be smaller. Also, it was a 9v.
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?) edit: Now with pictures!
Post by: jerryfreak on April 25, 2019, 02:54:08 PM
theres a somewhat spendy mps6040 batt box on reverb right now
Title: Re: DIY batterybox for dpa 4061 (iso: schematics?)
Post by: rhinowing on May 02, 2019, 02:22:17 PM

I think the sp 11 used to be quite similar in size...had the roll off switches, but was tiny and had a nice “ sled” that the 9v fit into. They’re not making it any longer...

Not true.  Sound Professionals still makes the SPSB-11.  However, its slightly bigger than the SPSB-10.   SP-10 is the way to go, imo.  Ultra tiny setup.

https://www.soundprofessionals.com/cgi-bin/gold/item/SP-SPSB-11

They used to sell this box as the SP-SPSB-10 back around 2008, my original rig had one. When I replaced it in 2012 I noticed that they now sell that box as the SPSB-11 and the new SPSB-10 is the same box but without switches