Author Topic: making a batterybox (Read 8855 times)

Weazel · « **on:** March 17, 2005, 08:07:59 PM »

i made a new battery box in use with a 12 volt mini battery. i needed no roll off so i used 2,2 uF capicators.

setboy · « **Reply #1 on:** March 17, 2005, 09:01:26 PM »

cool

how hard was that? did you have plans for it?

+T

Raphael

Weazel · « **Reply #2 on:** March 17, 2005, 09:11:41 PM »

it's not hard only 4 parts.

--------------||---------------------------hot--- (left)
| 2.2 microfarad
from left mic | input capacitor
|
---hot--------+----10k ohm-- "+"
\
---ground----------------------)---+--------------------shield-----
/ |
---hot--------+----10k ohm-- "+" "-"
| resistor 9 volt
from right mic| battery
|
--------------||---------------------------hot--- (right)
2,2 microfarad
input capacitor

setboy · « **Reply #3 on:** March 17, 2005, 09:37:43 PM »

cool thanks
i think i am going to give this a shot some time

you should put this in the The Archive

Raphael

thierryhenry · « **Reply #4 on:** March 18, 2005, 10:00:07 AM »

Very cool!

Weazel · « **Reply #5 on:** March 24, 2005, 08:34:01 AM »

i'm going to stealth with it tomorrow.

setboy · « **Reply #6 on:** March 24, 2005, 12:52:46 PM »

let us know how it goes

Raphael

Weazel · « **Reply #7 on:** March 26, 2005, 04:49:21 AM »

i didnt' tape we were lost couldn't find the venue and came in a half hour to late, i hope someone taped it was a verry good show. John Fogerty rocks. better luck next time.

setboy · « **Reply #8 on:** March 26, 2005, 10:53:46 AM »

Quote from: Weazel on March 26, 2005, 04:49:21 AM

i didnt' tape we were lost couldn't find the venue and came in a half hour to late, i hope someone taped it was a verry good show. John Fogerty rocks. better luck next time.

sorry to hear that

Raphael

kuba · « **Reply #9 on:** March 26, 2005, 11:00:08 AM »

Nice work.

If I were you, I'd isolate the soldered joins in order to avoid short circuit. (hope you understand my crappy tech english

).

A bit better schematics

setboy · « **Reply #10 on:** April 10, 2005, 05:44:05 PM »

have you run this yet?

Raphael

Weazel · « **Reply #11 on:** April 11, 2005, 11:29:58 AM »

not yet. i tested it at home. but not in the field yet.
im sure it will work. now i await for a nice gig.

relaxing · « **Reply #12 on:** April 12, 2005, 12:31:16 PM »

I built this + it successfully powered my DPA 4061's. The SP-Preamp does the job now though.

Weazel · « **Reply #13 on:** April 12, 2005, 06:10:28 PM »

great to hear it workes there too. you used 12v battery's too or the 9 vollts?

relaxing · « **Reply #14 on:** April 13, 2005, 12:10:34 PM »

Quote from: Weazel on April 12, 2005, 06:10:28 PM

great to hear it workes there too. you used 12v battery's too or the 9 vollts?

9V

TheMetalist · « **Reply #15 on:** April 17, 2005, 02:47:01 AM »

Hey. I guess you are the man to ask.

I need a battery module with an adjustable bass roll-off filter (no level control needed).

A friend of mine will help me to build one but he doesn't really know how to do it (he is an electrician but doesn't know a thing about taping). Is it possible to get some info about this? I would appreciate it a lot as they are very expensive to buy.

It will be used together with my SHARP Minidisc recorder MD-MT770W and Sound Professionals Mini Binaural Microphones SP-BMC-2. Hopefully making some good recordings in the future.

Weazel · « **Reply #16 on:** April 17, 2005, 11:24:10 AM »

i found this shematic on mic bulders. it has a switchable bass roll off.
you need to make it two times for stereo.

TheMetalist · « **Reply #17 on:** April 17, 2005, 01:15:52 PM »

Oh! Thanks!

I guess this was a bit easier to understand. I'm just curious about one thing. In the description we can read "electret". Is that for electret mics only? I have mini binaureal mics. Could it make any difference?

Weazel · « **Reply #18 on:** April 17, 2005, 04:06:38 PM »

you'll be fine with your mics. this gives 9 volt plugin power to your mics. with this your mics are 'electred'.

oh yes the part with the battery and everything left from it you only have to builth once.

kuba · « **Reply #19 on:** April 17, 2005, 06:23:59 PM »

Why are there used those capacitors in series with battery??

Weazel · « **Reply #20 on:** April 18, 2005, 09:37:16 AM »

from the info text file with this schematic.

There are 2 capacitors (C3, C4) across the 9 v battery. These are optional but
help bypass internal impedance of the battery at audio frequencies. The battery
powers the electret through a 5.6 k resistor (R1). I don't know if this value is
optimum - comments welcomed.

kuba · « **Reply #21 on:** April 19, 2005, 03:41:40 PM »

Time to try out my soldering skills

deadhoarse · « **Reply #22 on:** April 19, 2005, 04:00:03 PM »

Quote from: kuba on April 19, 2005, 03:41:40 PM

[img /img]

Time to try out my soldering skills

What kind of caps are those? Tantalum? Those aren't the best to put in the path of an audio signal.

kuba · « **Reply #23 on:** April 19, 2005, 04:27:36 PM »

Quote from: deadhoarse on April 19, 2005, 04:00:03 PM

What kind of caps are those? Tantalum? Those aren't the best to put in the path of an audio signal.

They're listed as ceramic...

Karl · « **Reply #24 on:** April 19, 2005, 05:21:25 PM »

Some comments since I see that you are using 12v instead of 9v...

I have experimented a little, and experimented with 9v vs 18v. I tested with two mics, AT853 and PC-62. 18v improved the AT853 performance, but the PC-62 suffered. I would try your setup both ways, that extra 3 volts may not be a good thing, then again it might.

deadhoarse · « **Reply #25 on:** April 20, 2005, 12:25:32 AM »

Quote from: kuba on April 19, 2005, 04:27:36 PM

They're listed as ceramic...

Polypropylene metal film caps will better suit this project, I don't think ceramic are very good.

kuba · « **Reply #26 on:** April 20, 2005, 03:55:52 AM »

Quote from: deadhoarse on April 20, 2005, 12:25:32 AM

Polypropylene metal film caps will better suit this project, I don't think ceramic are very good.

Yeah, I know. However, there aren't any film caps with capacity lower than 1uF. I want to use 220nF...

deadhoarse · « **Reply #27 on:** April 20, 2005, 09:18:28 AM »

Quote from: kuba on April 20, 2005, 03:55:52 AM

Yeah, I know. However, there aren't any film caps with capacity lower than 1uF. I want to use 220nF...

Um, there is a huge selection of film caps under 1uf. Go to digikey.com or mouser.com. This past week I ordered a bunch of metal poly capacitors for some new battery boxes.

Weazel · « **Reply #28 on:** April 20, 2005, 10:16:32 AM »

Quote from: Karl on April 19, 2005, 05:21:25 PM

Some comments since I see that you are using 12v instead of 9v...

I have experimented a little, and experimented with 9v vs 18v. I tested with two mics, AT853 and PC-62. 18v improved the AT853 performance, but the PC-62 suffered. I would try your setup both ways, that extra 3 volts may not be a good thing, then again it might.

sound proffesionals use 12v now also, so i think it should be ok.

kuba · « **Reply #29 on:** April 21, 2005, 07:00:11 AM »

Quote from: deadhoarse on April 20, 2005, 09:18:28 AM

m, there is a huge selection of film caps under 1uf. Go to digikey.com or mouser.com. This past week I ordered a bunch of metal poly capacitors for some new battery boxes.

Hehe... I'm not in US, man

Author Topic: making a batterybox (Read 8855 times)

thierryhenry