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DIY Class-A mic-preamp
DIY Class-A mic-preamp
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Old 11th December 2006, 06:42 AM   #11
lineup is offline lineup  Sweden
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Default lineup Regulator 7.200 Volt image 3 closeup

my 7.200 volt regulator
3 transistors

this shows my circuit & components better
one close up image of top side

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Old 11th December 2006, 05:05 PM   #12
Wavebourn is offline Wavebourn  United States
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DIY Class-A mic-preamp
Originally posted by Minion
I"ve used this ballanced discreet design with good results in the Past ,It has very low Noise levels with low impedance mics which is most these days...

It can be easilly adapted for phantom power and if you need more Gain you can throw a dual opamp at the end.....

It uses up very little PCB space so you can put a Bunch in a small area and it uses very little Current so you can run a lot of Channels on a wimpy power supply.....

Altec Lansing mic preamp?
Nothing in the universe is perfect. The ideal things are the ones that are most optimal. Optimization criteria, what matters. When I hear "No Compromise Design", I want to take a sledgehammer and test how impact-proof it is.
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Old 11th December 2006, 05:26 PM   #13
Samuel Jayaraj is offline Samuel Jayaraj  India
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No just picked up from Rod Elliot's site; only the front end is shown used, the next stage, which is a differential opamp has been left out.
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Old 11th December 2006, 07:36 PM   #14
Minion is offline Minion  Canada
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Actually It is a Modified version of one from Rod eliot site, I modified it a bit (Uses a different Transistor) as I got better results this way, also with the Rod eliot version the output isn"t ballanced and this way it is ballanced but with a bit less gain.....

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Old 3rd December 2009, 01:47 PM   #15
toddler is offline toddler  United States
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Default Newbie questions

Hi guys,
This is my first post here, and I'm a beginner with anything other than tube amp builds. So I can solder, but I have no clue as to op-amps and FETS and such. I'd like to build a battery powered microphone pre-amp to boost the signal of a dynamic microphone, which will then run into one of the XLR inputs on a Zoom H4n. Because there will be a condenser mic into the other XLR, phantom power is going to be on.

The H4n will allow this, but I have to turn the gain way up and the preamp adds a lot of noise at that level to they dynamic mic. So I'd like to amplify the dynamic mic outside the recorder.

I can understand Minion's schematic, but have a couple of questions before I start on it.

1) Will running the output of that Pre-amp into an XLR with phantom power on cause any problems? If it will, I'll have to use an unbalanced input jack for my second channel.

2) Do I need to build a separate power supply to make a 9v battery give me 15V, or could I just use 2-9V batteries in series.

If building a 15v powersupply circuit is better, I'm game.

Thanks for taking the time to educate a beginner,
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Old 4th December 2009, 03:28 PM   #16
toddler is offline toddler  United States
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OK, I read more. Seems that I can just use one of these : LINEAR TECHNOLOGY|LTC1044CS8#PBF|DC/DC Charge Pump Converter IC | Newark.com

and a small cap and resistor to get 15V. But what about the issue of the phantom power on the H4n? Help please.

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