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Author Topic: making a batterybox  (Read 8829 times)

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Offline TheMetalist

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Re: making a batterybox
« 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.
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Offline Weazel

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Re: making a batterybox
« 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.

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Offline TheMetalist

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Re: making a batterybox
« 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?  ::)
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Offline Weazel

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Re: making a batterybox
« 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.
« Last Edit: April 17, 2005, 04:08:58 PM by Weazel »
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Offline kuba

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Re: making a batterybox
« Reply #19 on: April 17, 2005, 06:23:59 PM »
Why are there used those capacitors in series with battery??
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Offline Weazel

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Re: making a batterybox
« 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.
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Offline kuba

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Re: making a batterybox
« Reply #21 on: April 19, 2005, 03:41:40 PM »


Time to try out my soldering skills ;D
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Offline deadhoarse

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Re: making a batterybox
« 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 ;D

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

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Re: making a batterybox
« 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...
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Offline Karl

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Re: making a batterybox
« 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.
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Offline deadhoarse

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Re: making a batterybox
« 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.
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Offline kuba

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Re: making a batterybox
« 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...
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Offline deadhoarse

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Re: making a batterybox
« 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.
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Offline Weazel

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Re: making a batterybox
« 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.
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Offline kuba

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Re: making a batterybox
« 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  :P
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