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 PQ-4 Schematic & MOD
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MervsMods
Bronze Member

USA
133 Posts

Posted - 11/24/2009 :  14:56:28  Show Profile  Reply with Quote
Hi Guys!

Does anybody have a schematic for a PQ-4? I can't find one ANYWHERE!

Thanks!

Edited by - MervsMods on 12/01/2009 06:17:12

ssanyee
Silver Member

Hungary
288 Posts

Posted - 11/28/2009 :  16:19:20  Show Profile  Reply with Quote
Hello MervsMods,

I hope the link below will help you:

http://www.synthdiy.com/files/2007/boss_pq-4.png

cheers
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MervsMods
Bronze Member

USA
133 Posts

Posted - 12/01/2009 :  06:16:30  Show Profile  Reply with Quote
Hey Thanks Ssanyee!

Now here's the REAL question... I've been scouring about the net in search of the "paratrooper" mod for this guy. I've only read about how awesome it is...

Does ANYBODY have any idea on this particular mod? I'd like to see what they do, and compare it to my own mod of this pedal.
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Ptak
Bronze Member

141 Posts

Posted - 12/01/2009 :  06:28:18  Show Profile  Reply with Quote
Never heard of that mod. My PQ-4 is pretty awesome stock. I cant see it being any better. What exactly is it supposed to do?
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zerksies
Double Platinum Member

USA
3406 Posts

Posted - 12/01/2009 :  15:34:53  Show Profile  Send zerksies an AOL message  Click to see zerksies's MSN Messenger address  Send zerksies a Yahoo! Message  Reply with Quote
yeah, why would you wanna mod that
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ssanyee
Silver Member

Hungary
288 Posts

Posted - 12/01/2009 :  18:08:24  Show Profile  Reply with Quote
Hi MervsMods,

You are welcome!
Sorry but I did not hear about this modification.
However, PQ-4 is good as it is I also would not recommend to you to modify it!

cheers
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zerksies
Double Platinum Member

USA
3406 Posts

Posted - 12/01/2009 :  19:03:12  Show Profile  Send zerksies an AOL message  Click to see zerksies's MSN Messenger address  Send zerksies a Yahoo! Message  Reply with Quote
it's not a very common pedal, i mean it might be worth money in a few years.I would say look for a new pedal the does what you are looking for. and don't mod the PQ
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MervsMods
Bronze Member

USA
133 Posts

Posted - 12/02/2009 :  05:50:15  Show Profile  Reply with Quote
I quieted down the background noise (hisssssssss), and firmed up the bottom end. (it got a bit too flabby) I Do have all the original parts, so if it needs to go back to stock, it's no issue at all.
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Laurie
Double Platinum Member

Canada
4854 Posts

Posted - 12/02/2009 :  05:52:29  Show Profile  Visit Laurie's Homepage  Reply with Quote
quote:
Originally posted by MervsMods

I quieted down the background noise (hisssssssss), and firmed up the bottom end. (it got a bit too flabby) I Do have all the original parts, so if it needs to go back to stock, it's no issue at all.

G'day! Can you share the details of the mod?
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MervsMods
Bronze Member

USA
133 Posts

Posted - 12/07/2009 :  20:41:42  Show Profile  Reply with Quote
Hey Laurie,

Sure.. To be exact, I'll need to find my notes, and get back with you. But in a nutshell, I replaced (and changed values) some lower grade caps in the signal path, and shoved a Monte Allums opamp adapter in place of one of the in-lines with a Burr Brown OPLA (removed the hiss quite nicely), and swapped out the check LED and resitor with a Yellow one (much brighter)

NEXT PROJECT: Tackling an AC-2 and removing the background noise out of that one and tweaking the tone structure, making it a bit more usable. SMT doesn't scare me!!!

Merv


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Ptak
Bronze Member

141 Posts

Posted - 03/18/2010 :  04:21:31  Show Profile  Reply with Quote
just curious anybody else have any ideas on improving a pq-4?
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ChristoMephisto
Platinum Member

Canada
1288 Posts

Posted - 03/18/2010 :  14:24:25  Show Profile  Reply with Quote
quote:
Originally posted by Ptak

just curious anybody else have any ideas on improving a pq-4?



Put an EH-2 before it
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Pepe
Silver Member

Germany
230 Posts

Posted - 03/18/2010 :  18:46:42  Show Profile  Visit Pepe's Homepage  Reply with Quote
quote:
Originally posted by ChristoMephisto

quote:
Originally posted by Ptak

just curious anybody else have any ideas on improving a pq-4?



Put an EH-2 before it


Absolutely agreed!
Stop modding this gem! PQ-4 is great the way it is!
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Ptak
Bronze Member

141 Posts

Posted - 03/18/2010 :  19:57:09  Show Profile  Reply with Quote
quote:
Originally posted by PepeMusic

quote:
Originally posted by ChristoMephisto

quote:
Originally posted by Ptak

just curious anybody else have any ideas on improving a pq-4?



Put an EH-2 before it


Absolutely agreed!
Stop modding this gem! PQ-4 is great the way it is!



oh i never modded it... well i put in a green led. I agree that its great the way it is but im curious if theres anyway to somehow improve it even more!
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Ptak
Bronze Member

141 Posts

Posted - 03/21/2010 :  04:50:22  Show Profile  Reply with Quote
Ok so i decided to do a mod on it. Just changed the 1uf caps to metal film. Not really sure if it did much/anything BUT the PQ-4 is still sounding great.
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