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From: Brian Aase
Subject: Re: minimal mic pre DIY project using INA103?
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Date: 7 Nov 2002 15:13:29 GMT
The INA103 is a very nice chip, *IF* you pay careful attention to make
sure the input stage is free from parasitic oscillations. In my
experience, it pays to use the L-R input network shown in the data
sheet and then carefully check your finished circuit for evidence of
small (~100-200mV) oscillations in the tens of megahertz. Do this
with an assortment of microphones connected, to best simulate
I've noticed that some magazine columnists have given the INA103 a
bad rap for "harsh sound", and indeed I have found the same sort of
symptom when parasitics weren't properly excised.
There are a gazillion designs for audio peak limiters on the web.
Many of the simplest (i.e. lowest parts count) use some form of
optocoupler. You might want to look at the application notes at
For a multiplier-based design, look at http://www.thatcorp.com.
> have tried to ask this there and there but here I havent.
>Thanks for Scott Dorsey to pointing me possibility to use INA103 as main IC
>It's on top now, I even have those INA103 chips now (SSM2017 as well)...
>I plan to make decent portable micpre for film/videosound and for our
>ambient music project.
>recording medium is laptop PC, Nomad 3 HD recorder and different DAT's. Also
>are very welcome since I dont want to overload A/D converters...
>Here is DATASHEET for INA103 by Texas Instruments .:
>http://www-s.ti.com/sc/ds/ina103.pdf there is also proto design for micpre
>in that PDF
>There is also ready made design using INA103 chip.:
>One other option is to use Analog Devices SSM2017.:
>I would like to know opinions about these designs and if possible other
>designs as well.
>Quality should be something better that TASCAM DA-P1 at least.
>Mics I plan to use in this micpre are mainly.:
>Oktava MC012, MC011, MC319
>So there is need for Phantom design as well.
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