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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: Weazel on March 17, 2005, 08:07:59 PM
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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.
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cool
how hard was that? did you have plans for it?
+T
Raphael
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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
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cool thanks
i think i am going to give this a shot some time
you should put this in the The Archive
Raphael
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Very cool!
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i'm going to stealth with it tomorrow.
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let us know how it goes
Raphael
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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.
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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
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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 :o ).
A bit better schematics ;)
(http://roio.o106.com/bbox.gif)
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have you run this yet?
Raphael
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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.
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I built this + it successfully powered my DPA 4061's. The SP-Preamp does the job now though.
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great to hear it workes there too. you used 12v battery's too or the 9 vollts?
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great to hear it workes there too. you used 12v battery's too or the 9 vollts?
9V
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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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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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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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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.
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Why are there used those capacitors in series with battery??
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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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(http://roio.o106.com/bbox/soucastky.jpg)
Time to try out my soldering skills ;D
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[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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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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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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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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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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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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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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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