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Old 20th July 2003, 07:15 AM   #1
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Default Balanced Mic Preamp

Hi,

I'm looking for ideas / schematics for a balanced mic preamp for use in the PA system at my church... The mics are Shure sm48 / sm58 and similar ... I'd like something that sounds decent (and low distortion IS an issue here) rather than the typical cheap PA gear. The design can use discretes or opamps. Any ideas?

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Old 20th July 2003, 08:00 AM   #2
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Hi AF

Can you afford/get hold of input transformers? If so, there is a nice circuit I built from Walt Jung's new brick book on opamps that I use with my iMic to get sound into my laptop.
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Old 20th July 2003, 11:11 AM   #3
moamps is offline moamps  Croatia
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Default Re: Balanced Mic Preamp

Quote:
Originally posted by AudioFreak
[B]I'm looking for ideas / schematics for a balanced mic preamp for use in the PA system at my church... The mics are Shure sm48 / sm58 and similar ... I'd like something that sounds decent (and low distortion IS an issue here) rather than the typical cheap PA gear. The design can use discretes or opamps. Any ideas?
Hi,

- Analog Devices - SSM 2017/19
- Or, I can send to you one good schematic from Sound..... consoles. (2SA970/2sc2240/TL072).
- Do you think about using some kind of voice compressor?

Regards
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Old 20th July 2003, 11:46 AM   #4
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Default second the thought

for thinking about processing. Worth every nickle for live sound.
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Old 20th July 2003, 12:42 PM   #5
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We've got (primative) processing but need some gain earlier on in the chain. Input transformers (anything even slightly decent at least) are probably well outside my budget. I've looked at the 'all in one' preamps offered be analog but I'd rather use opamps / discretes as stated in my 1st post.

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Old 20th July 2003, 12:49 PM   #6
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take a look at those instrumentation opamps (you don't have to use an instrumentation opamps. an ordinary opamp will do) and you will get more than enough ideas.
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Old 20th July 2003, 01:21 PM   #7
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I'm hoping to do something that sounds reasonably decent 1st time around which is why I was asking for help. I could work something out on my own but I dont have the time or money to try endless components / combinations ... I really need something that will do the job pretty well straight out of the box (or off the soldering iron as the case may be).

Regards.
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Old 20th July 2003, 02:13 PM   #8
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Freakster,

Use the INA103. It's not too shabby sounding, has good specs and was available from Farnell or RS last time I looked.
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Old 20th July 2003, 03:01 PM   #9
moamps is offline moamps  Croatia
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Quote:
Originally posted by AudioFreak
[B]I'm hoping to do something that sounds reasonably decent 1st time around which is why I was asking for help.

Hi,

In Elektor 11/97 was published one stereo microphone preamp with AD SSM 2017. This amp work very good with studio condenser microphones (Sennheiser, AKG, Neuman)(my own experience). There is PCB, also. And you can order chips like samples, I guess. This is very good solution for you 150$ Shure.
If you are interested, I can send to you this article in pdf form.

Regards
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Old 20th July 2003, 03:33 PM   #10
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Hi, all

Quote:
Originally posted by moamps
In Elektor 11/97 was published one stereo microphone preamp with AD SSM 2017.
Analog Devices discontinued this IC. The better substitute is the TI/BB INA217:

http://focus.ti.com/docs/prod/produc...pfsection=desc

But you can find a good source of schematics at Rane website:

http://www.rane.com

For exemple, their stand-alone mic preamp:

http://www.rane.com/ms1b.html

Scroll down and click on "schematic".

hope this hleps,
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