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DWBH
Copper Member
Portugal
10 Posts |
 Posted - 05/10/2009 : 19:47:37
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I have an RV-3 that, when turned on/off, produces a slight interruption in sound.
If i'm playing something and I turn the pedal on, the sound is cut, for a fraction of a second. This happens both turning the pedal on and off.
Apparently this doesn't happen to all RV-3 pedals.
Is there a way to fix this? |
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DWBH
Copper Member
Portugal
10 Posts |
Posted - 07/03/2009 : 17:27:14
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| bump? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 07/03/2009 : 18:15:10
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| hah! I just posted that mine is the opposite... slight bump up in sound as it is switched 9as opposed to a slight dip as you are experienceing - they are almost certainly related). i think i am on the track of what is causing it - will let you know if i get mine fixed. |
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sp-1
Platinum Member
Germany
1454 Posts |
Posted - 07/03/2009 : 18:16:46
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quote:
Originally posted by DWBH
I have an RV-3 that, when turned on/off, produces a slight interruption in sound.
If i'm playing something and I turn the pedal on, the sound is cut, for a fraction of a second. This happens both turning the pedal on and off.
Apparently this doesn't happen to all RV-3 pedals.
Is there a way to fix this?
Mine does the same  |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 07/03/2009 : 18:56:43
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| I think it's an easy (but delicate) fix... I'll post details if i can get mine sorted out over the weekend. |
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DWBH
Copper Member
Portugal
10 Posts |
Posted - 07/03/2009 : 19:52:00
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I've never heard of that 'boost' problem, but most people I've talked to (that have/had an RV-3) had the same problem as mine has.
I'm not sure whether it's that easy. The switch is connected to a chip, not a flip-flop circuit. |
Edited by - DWBH on 07/03/2009 19:52:38 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 07/03/2009 : 20:17:04
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quote:
Originally posted by DWBH
I'm not sure whether it's that easy. The switch is connected to a chip, not a flip-flop circuit.
Yeah... but I know how this thing is put together ... I think I can say "trust me" 
I've traced/watched the switching drive of the FETS on the scope and it's very straightforward.
It looks to be the rise/fall times of the switching FETS. The reason mine is "inverted' to yours is that I changed one of the FETs for a non-standard (the original one was damaged).
My current theory is that, for mine, one FET rises faster than the other falls, giving a "bump" in volume for maybe quarter of a second. If the opposte happens (one falls faster than the other rises) you will get a "dip" in volume. This rise/fall time is dependent on the time constant of the external components (not the FET), so can be fixed.
I have to fix mine, so once I sus it out fully and have it working properly I'll post on here.
My expectation is that to fix the dip will require changing a surface mount resistor (or capacitor) - delicate, but doable.
of course, i may be completely wrong, and if that's the case I let you know 
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DWBH
Copper Member
Portugal
10 Posts |
Posted - 07/03/2009 : 21:09:49
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| It's not really a dip in volume, because when the pedal is on, the volume is the same as in bypass. It's just a small hiccup when it's switched on/off. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 07/03/2009 : 23:40:26
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quote:
Originally posted by DWBH
It's not really a dip in volume, because when the pedal is on, the volume is the same as in bypass. It's just a small hiccup when it's switched on/off.
Yes - that's exactly it. A "dip" when it switches. |
Edited by - Laurie on 07/03/2009 23:40:38 |
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DWBH
Copper Member
Portugal
10 Posts |
Posted - 07/03/2009 : 23:42:26
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Yeah. Come to think of it, I can say it's a dip.
:P |
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Ward
Copper Member
Australia
28 Posts |
Posted - 07/04/2009 : 01:57:34
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| Ah well, there you go, I just posted about this "dip" in the other thread. I wouldn't call it a dip though, it's a definate and total lack of sound for a fraction of a second, maybe I'm just not hip with the lingo, it will be interesting if Laurie's does this after he fixes his problem. |
Edited by - Ward on 07/04/2009 01:59:12 |
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RV-3 - switching problem
