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hot tubes
Silver Member
Canada
162 Posts |
 Posted - 01/29/2009 : 06:02:48
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hello to the forum.
i have tryed to mod a DS1 and in my opinion it is sounding great ,
but one problem still exists , i have this high pitch squeel or
like a feedback sound when i turn the gain nob to almost the max.
this happens at real low volumes also , its going to mess up a
otherwise good mod imo .
any help would great . thanks.
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Edited by - hot tubes on 01/29/2009 06:03:31 |
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leonard d rock
Silver Member
Philippines
301 Posts |
Posted - 01/29/2009 : 09:57:06
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check you solder points and traces. your solder may have spit and shorted two components which shouldn't be connected.
ldr |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/29/2009 : 11:47:41
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What kind of mods have you performed ?
Some further info would be useful to identify what causes the problem. |
Edited by - cctsim on 01/29/2009 15:44:44 |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 01/29/2009 : 14:44:26
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your basic changes , cap ,resistor , clipping diodes , its a blend of
a few different mods , i was trying to get alot of gain out of the
pedal , it was to be used as a stand alone distortion pedal , not as
a boost pedal , i need a big full sound out of it , and so far it was going well . i have checked the solders and they appear ok.
the clipping diodes sit very close together , if the solder was to
cover both points on the back side would that cause this problem ,
that is the only place that looks suspicious ?
thanks again |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 01/30/2009 : 00:21:47
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| that is a possibility |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/30/2009 : 00:50:54
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R13 and C8 can be critical.
If R13 is set to low it will result in high gain and oscillation.
What values did you set them to ? |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 01/30/2009 : 02:06:26
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r13 was changed to 2.2k
c8 was changed to 1 uf
other values were also changed to:
c3 to .022
c10 to .033
r11 to 100 k
r14 to 2.2 k
and the clipping diode is as follows :
d4 4148 in series with a 3mm LED
d5 4148 in series with a 3mm LED
this may be a strange clipping set up , but it sounded good to me ?
any sugestions would be welcome .
thanks for your help . |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/30/2009 : 03:21:47
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R11 and R14 are the same values as the original.
Did you just use better quality resistors ?
It is worth double checking R11. In the past, I have mixed myself 100k with 1M a few times.
The polarity of the diodes is also worth double checking.
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 01/30/2009 : 04:38:35
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my mod sheet calls for those values in R14 and R11, strange ??
rechecked both values with my meter and there right on ,100k & 2.2 !
and also rechecked the diode polarity , seems to be ok.
in your opinion does C8 & R13 sound right for value ?
i was hoping to get more gain from this pedal without giving up
alot of tone.
thanks |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/30/2009 : 06:17:46
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The C8 & R13 values you are using are ok.
I would try changing C7 from 10pF to 220pF or even 470pF. |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 01/30/2009 : 17:11:43
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| what effect does the c7 have on the tone etc. ? |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/30/2009 : 22:55:12
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C7 is located in the feedback loop of the frequency amplifier and if increased will roll-off the high frequencies a bit faster.
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Edited by - cctsim on 01/30/2009 23:05:56 |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/30/2009 : 23:07:18
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What is the name of this mod by the way or what is the modder/designer ?
Could you disclose this info ? |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 02/01/2009 : 17:49:26
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this is a blend of 2 mods taking the good parts of each and
trying to put it together for a mod that has a fair amount
gain , but has a big full sound on its own . i have found that
on some DS1 mods the gain is great , but it lacks in the tone
dept. , so i'm trying to get heavy gain with great tone , so
far its going great , by far better than stock !!!
thanks again for your help |
Edited by - hot tubes on 02/01/2009 17:51:29 |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 02/03/2009 : 04:58:06
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my squeal still remains when the gain is at or near the max.
back it off just a little and it goes away .this mod sounds great but this noise is driving me to drink !!
any other ideas ?
thanks a million ! |
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Topic |
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DS1 PROBLEMS ???
