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Author Topic: building a microphone 9v battery power supply for beginners  (Read 2926 times)

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Offline gazatthebop

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building a microphone 9v battery power supply for beginners
« on: November 19, 2020, 02:59:36 PM »
https://www.church-audio.com/shop/battery-boxes/ugly-battery-box/

Rather than spend money i don't have can anyone explain how to make one of these (CA11 9Vbattery power supply). It looks simple enough!

Offline ycoop

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Offline jerryfreak

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Re: building a microphone 9v battery power supply for beginners
« Reply #2 on: November 19, 2020, 05:30:21 PM »
depends on 2-wire or 3-wire mic of course, the latter being simpler. in general both require a voltage source,a current-limiting resistor, and a smoothing capacitor

a 2-wire design needs a decoupling capacitor in line
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Offline gazatthebop

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Re: building a microphone 9v battery power supply for beginners
« Reply #3 on: November 20, 2020, 12:05:59 PM »
thanks for replies

Offline DavidPuddy

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Re: building a microphone 9v battery power supply for beginners
« Reply #4 on: November 20, 2020, 12:49:24 PM »
This should help:

http://forums.sonyinsider.com/topic/14343-how-to-build-a-stereo-microphone-and-battery-box/

This is great, thanks. I just ordered the parts from Digikey to build a few of these in altoids tins. I will be able to use my MKE2 mics again, finally...
« Last Edit: November 20, 2020, 04:00:32 PM by DavidPuddy »
mk41/mk22 > CMC1L > Mixpre 6ii

Offline DavidPuddy

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Re: building a microphone 9v battery power supply for beginners
« Reply #5 on: November 30, 2020, 01:21:15 AM »
I built the battery "box" from the Sony Insiders site tonight. If you have a soldering iron, you can build this easily. Just watch a few soldering technique videos on youtube to make sure you get a good mechanical/electrical connection or you'll be building this again.

Here's the parts I used:

2x RES 6.8K OHM 1/4W 1% AXIAL
2x CAP ALUM 1.5UF 20% 50V RADIAL
1x Battery Snap
1x 3.5mm Female Audio Jack - Stereo
1x Stripped 3.5mm Male Stereo Plug (from old cable)
1x Breadboard

However, I'm still getting 10.8v at the inputs, so it seems like the resistors are not lowering the voltage from the battery at all. Perhaps I should have used a higher value resistor. Sennheiser says the MKE2s (gopro hack) need ~7.5v, so if anyone knows if seeing the full 10.8v from the Powerex battery will cause problems, I'm all ears. I have some regular 9v rechargables in case i need to use those.

Anyway, I'll be attempting to mount it in an Altoids tin with some hot glue. I'll update with pics if anyone wants to see my admittedly amateur work.
« Last Edit: November 30, 2020, 05:20:09 PM by DavidPuddy »
mk41/mk22 > CMC1L > Mixpre 6ii

Offline boa

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Re: building a microphone 9v battery power supply for beginners
« Reply #6 on: November 30, 2020, 09:20:14 AM »
I'd like to see pics. I am looking for a battery box. Thanks.
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Offline robeti

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Re: building a microphone 9v battery power supply for beginners
« Reply #7 on: November 30, 2020, 09:33:42 AM »
https://www.church-audio.com/shop/battery-boxes/ugly-battery-box/

Rather than spend money i don't have can anyone explain how to make one of these (CA11 9Vbattery power supply). It looks simple enough!

You don't have $36,- ?
Wow.
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Offline jerryfreak

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Re: building a microphone 9v battery power supply for beginners
« Reply #8 on: November 30, 2020, 09:51:11 AM »
you can always switch from a 9.6V battery to an 8.4. has more mAh as well...

I built the battery "box" from the Sony Insiders site tonight.

Here's the parts I used:

2x RES 6.8K OHM 1/4W 1% AXIAL
2x CAP ALUM 1.5UF 20% 50V RADIAL
1x Battery Snap
1x 3.5mm Female Audio Jack - Stereo
1x Stripped 3.5mm Male Stereo Plug (from old cable)
1x Breadboard

However, I'm still getting 10.8v at the inputs, so it seems like the resistors are not lowering the voltage from the battery at all. Perhaps I should have used a higher value resistor. Sennheiser says the MKE2s (gopro hack) need ~7.5v, so if anyone knows if seeing the full 10.8v from the Powerex battery will cause problems, I'm all ears. I have some regular 9v rechargables in case i need to use those.

Anyway, I'll be attempting to mount it in an Altoids tin with some hot glue. I'll update with pics if anyone wants to see my admittedly amateur work.
currently "banned" for this "controversial" post
email me if you need to connect, as i am not allowed to send PM

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for sale (email in profile):
Mixpre6 v1 (NIB)
CA14 cards
(2) Manfrotto 099B mic poles

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Offline DavidPuddy

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Re: building a microphone 9v battery power supply for beginners
« Reply #9 on: November 30, 2020, 10:37:45 AM »
Here are the pictures. As you can see, there's not really much to this box and it looks like if you don't need any voltage attenuation, you can simply skip the resistors (unless i'm missing something to do with channel separation - please correct me if so). The altoids tin is probably 33% too big for this but it's easy to put together and common enough to not get a second look. I'm going to shrink wrap the ground connection and hot glue everything to the board as this board does not have pads to stabilize the components.

https://imgur.com/a/QnLToXM

https://imgur.com/PRS7wRt

https://imgur.com/uvUmr2x

https://imgur.com/SiOe1XQ

EDIT: Under load it looks like the voltage drop across the resistors is adequate. Measuring 10.8v from the battery (powerex 9.6v) and 8.2v at tip and ring. Running this on a Tenergy 9v gives the mics under 7.5v, so I'll use the Powerex for this application.
« Last Edit: November 30, 2020, 05:38:38 PM by DavidPuddy »
mk41/mk22 > CMC1L > Mixpre 6ii

Offline kuba e

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Re: building a microphone 9v battery power supply for beginners
« Reply #10 on: November 30, 2020, 03:34:06 PM »
David, thanks for the pictures. The voltage drop across the resistor corresponds to the current  that flows to the microphone. The function of the resistor in 9V battery box is to limit the current. What I read here on the forum, the current is more important than the voltage of 9V. You could calculate the value of that resistor according to the parameters of a specific microphone (I am not able to do it). Or if you have chosen a value that others use, that will be fine.

Roberti, sometimes it's good to try to do it yourself, because you can learn something extra. Of course, there are cases where I blame myself for not giving it to a professional.
« Last Edit: November 30, 2020, 03:46:08 PM by kuba e »

Offline DavidPuddy

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Re: building a microphone 9v battery power supply for beginners
« Reply #11 on: November 30, 2020, 04:17:58 PM »
https://www.church-audio.com/shop/battery-boxes/ugly-battery-box/

Rather than spend money i don't have can anyone explain how to make one of these (CA11 9Vbattery power supply). It looks simple enough!

You don't have $36,- ?
Wow.

Some people prefer to build something that they can service themselves in the event of a failure...

David, thanks for the pictures. The voltage drop across the resistor corresponds to the current  that flows to the microphone. The function of the resistor in 9V battery box is to limit the current. What I read here on the forum, the current is more important than the voltage of 9V. You could calculate the value of that resistor according to the parameters of a specific microphone (I am not able to do it). Or if you have chosen a value that others use, that will be fine.


Thanks for the post. I bought a used intro to electronics textbook and will be slowly making my way through it.
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Offline seethreepo

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Re: building a microphone 9v battery power supply for beginners
« Reply #12 on: November 30, 2020, 07:11:47 PM »
David, thanks for the pictures. The voltage drop across the resistor corresponds to the current  that flows to the microphone. The function of the resistor in 9V battery box is to limit the current. What I read here on the forum, the current is more important than the voltage of 9V. You could calculate the value of that resistor according to the parameters of a specific microphone (I am not able to do it). Or if you have chosen a value that others use, that will be fine.

Roberti, sometimes it's good to try to do it yourself, because you can learn something extra. Of course, there are cases where I blame myself for not giving it to a professional.

This 
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Offline seethreepo

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Re: building a microphone 9v battery power supply for beginners
« Reply #13 on: November 30, 2020, 07:23:38 PM »
I'd like to see pics. I am looking for a battery box. Thanks.

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Offline goodcooker

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Re: building a microphone 9v battery power supply for beginners
« Reply #14 on: December 02, 2020, 12:11:01 PM »

I built a battery box years ago just to see if I could do it. It was kinda fun. The parts cost more than an already finished box but learning some simple circuit design and construction was beneficial. I'll see if I can find the schematic I used and some pics of the finished product.
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