The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Brian Aase
Subject: Re: minimal mic pre DIY project using INA103?
X-Newsreader: Forte Agent 1.91/32.564
Organization: Uncensored-News.Com $9.95 Uncensored Newsgroups.
X-Report-Abuse-To: email@example.com Send only the header of the offending post, DO NOT attach any file.
X-Comment: NOTICE: Uncensored-News.Com does not condone, nor support, spam, illegal or copyrighted postings.
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.
Posted Via Uncensored-News.Com - Still Only $9.95 - http://www.uncensored-news.com
<><><><><><><> The Worlds Uncensored News Source <><><><><><><><>
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup