Hi, I built the sansamp with tonepad.com layout with TLC2262 in IC 2,3,4 and Tl072 in ic1. All the settings work but I have two problems.
-First there is a switch popping between amp switching (maybe normal because this switch moves Vb to different ics).
-Second there is a horrible squeal at high gain settings.
Things I tried.--
I shielded the input jack and in and out sansamp wires with braided shield and put a 47pf cap across input to ground with the squeal a little less but still enough to bug me like crazy. Also added 100uf across rails but no change so not power filtering prob
I am using no stomp switch for the pedal and I noticed that when I place my finger on the plastic of my insulated input jack the noise gets louder( hiss to a squeal depending on volume and gain settings). In addition when turning the gain knob I get a scratchy noise.
On the 3c input jack I have the Signal, battery (-), and all grounds from the board and other components. Touching the plastic of the output jack doesn't make the hiss/squeal worse.
I love the sound of this pedal and maybe I am being to picky to eliminate most of the noise but I would like to combat it more. Is this radio interference ?
Thanks,
matt
Hi
I've a kind of feedback too, and many others too. I think there's nothing that you can do to solve this pb, unfortunatly (but I whish I could be wrong)
-fx
That sucks.. Sounds great ne way with a noise supressor for high gain. Another question for this list . My tweed setting has a large volume drop. I have read others have this problem but haven;t seen a fix for it. Any ideas?
I will checking IC voltages to make sure power leads are getting it there.
-matt
hi !!
so far i have builded tree GT2, and all of them have the same problem...What i do is set the gain at 50% max and use a TS 808 (a clone) or another overdrive to push it...
Another usefull thing is to put a non true bypass stompbox in the front to reduce that nasty feedback noise...
I will sheild some more wires and see if I can minimize it but prob not. Any ideas on the low volume for the tweed setting. I have read that someone had a similiar problem on build reports on tonepad.com but the fix is not clear.
Thanks for helping me get this awesome pedal optimized.
-MAtt
Hi all,
All your squeal problems are solved if you change your IC for new ones... That's the trick... ;)
Regards
Quote from: plucky on July 20, 2006, 10:45:21 AM
Hi all,
All your squeal problems are solved if you change your IC for new ones... That's the trick... ;)
Regards
I tried many different ones, and there is alays the same problem :|
-fx
Liberal use of shielded wire, and a short, neat wiring did the trick for me. I also had to wire the bypass switch to ground the input when the fx is bypassed to avoid squealing in bypass mode.