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Author Topic: AD20-PS-2 hack  (Read 7942 times)

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Offline Church-Audio

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Re: AD20-PS-2 hack
« Reply #15 on: March 06, 2007, 05:40:21 PM »
Quote from: Nick's Picks on March 06, 2007, 05:38:13 PM
runs off of either 9v DC in put or 9v battery.
i'll get down to the bench to check out the chips and report back...after dinner.



If its a dual supply and I am pretty sure it is. There will be + on pin #8 and - on pin #4 of the ne5532 with repect to ground.
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Offline Digital Quality

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Re: AD20-PS-2 hack
« Reply #16 on: March 06, 2007, 05:47:35 PM »
I'm still betting on single side but I'm sorta cheating because I have a fuzzy memory of looking up this chip.

Couldn't you get the same headrooom/noise figure with a higher input voltage vs dual sided?
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Offline Church-Audio

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Re: AD20-PS-2 hack
« Reply #17 on: March 06, 2007, 05:51:32 PM »
Quote from: Jam_ON 017 on March 06, 2007, 05:47:35 PM
I'm still betting on single side but I'm sorta cheating because I have a fuzzy memory of looking up this chip.

Couldn't you get the same headrooom/noise figure with a higher input voltage vs dual sided?

There are a million and one different ways to build a circuit as a general rule with preamps its always better to run a dual supply. When you dont you also increase your chances of noise due to the fact that you dont have the same isolation as you do with you 0 volt ground rail. Because your obtaining part of your signal from the negative rail *tied to audio ground* your also increasing noise. So most good designers would stay away from a single supply for a mic preamp. I am not saying that this is not the case here but I would be surprised with a digital circuit if it was not a dual supply as most of the a/d chips I have ever seen require a dual supply.

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Offline Digital Quality

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Re: AD20-PS-2 hack
« Reply #18 on: March 06, 2007, 05:54:04 PM »
Ahh- CMRR PSRR interesting, thanks.

« Last Edit: March 06, 2007, 06:51:04 PM by Jam_ON 017 »
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Offline Kindguy

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Re: AD20-PS-2 hack
« Reply #19 on: March 09, 2007, 06:34:27 PM »
T+ this is interesting.
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Offline oscoastierob

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Re: AD20-PS-2 hack
« Reply #20 on: April 06, 2007, 04:57:05 PM »
any updates on how this project is going??
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Offline Nick's Picks

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Re: AD20-PS-2 hack
« Reply #21 on: April 06, 2007, 05:45:35 PM »
on the shelf until I get caught up on cable orders.
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Offline ArchivalAudio

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Re: AD20-PS-2 hack
« Reply #22 on: May 01, 2007, 12:34:15 AM »
most of the op amp talk is over my head
but I do know that both the AD-20 and PS 2 can runn off of 7v - 24v DC
though if my memory serves me
the AD-20 is really only 7v to 18v
or may be its the other way around
I used to power my AD-2- and PS-2 off of one single 12v SLA
in order to get the phantom running for longer that a 9v cell

good luck this sounds like a cool project

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Offline Nick's Picks

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Re: AD20-PS-2 hack
« Reply #23 on: May 01, 2007, 06:01:53 AM »
i'm just getting back to it...

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Offline Church-Audio

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Re: AD20-PS-2 hack
« Reply #24 on: May 01, 2007, 10:20:37 AM »
Quote from: Nick's Picks on May 01, 2007, 06:01:53 AM
i'm just getting back to it...



Let me know if you need any help there Nick..

Chris

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Offline Nick's Picks

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Re: AD20-PS-2 hack
« Reply #25 on: May 02, 2007, 07:39:00 AM »
my plan was to take some pictures of the ad20 board, and let you point out what I can attempt to replace in terms of parts on it.
:)  that will help me learn to identify the parts...and get an idea of what good/vs bad is.

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