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rschua
Copper Member
Philippines
34 Posts |
 Posted - 04/02/2007 : 09:37:20
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My boss ds-1 distortion is doing just fine for more than a year now. I've been using it in my pedalboard with a Boss GE-7 after it and a compressor before it. However I noticed that when the DS-1 is disengaged I can hear the distortion bleeding thru my clean when distortion knob is from halfway to max. I remove the DS-1 from my pedalboard then put a battery in it then plug it directly right into my amp as I thought the problem was with my power supply or other pedals messing up the signal in my pedalboard, I noticed that the problem was the same. The distortion is still bleeding thru the clean when the DS1 pedal is disengaged. The distortion is only noticeable when the distortion knob is from 12 o'clock to max. If the dist. knob is on 11 o'clock and below, the distortion is no longer noticeable. What could be the problem w/ this pedal? Is there a parts that needs to be replaced? A mods or values that needs to be changed? What could be the reason why it's acting up this way and what's needed to be done in order to resolve this issue?
Any assistance or info regarding this would be greatly appreciated.
Thank you,
Chad |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/02/2007 : 10:09:22
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Hi rschua
Maybe one of the FETs that are switched by the Flip Flop Circuit, in the DS-1, have become leaky, or maybe the bias on the Gate terminal for the FET has changed.
I can't say that I have come across this fault before.
Sorry I can't offer you any other advice.
Please keep us in formed of your progress.
Regards Dr. Bob |
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rschua
Copper Member
Philippines
34 Posts |
Posted - 04/02/2007 : 14:36:14
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quote:
Originally posted by Dr. Bob
Hi rschua
Maybe one of the FETs that are switched by the Flip Flop Circuit, in the DS-1, have become leaky, or maybe the bias on the Gate terminal for the FET has changed.
I can't say that I have come across this fault before.
Sorry I can't offer you any other advice.
Please keep us in formed of your progress.
Regards Dr. Bob
Hello there Dr. Bob.
I'm not familiar w/ the DS-1 circuit and I'm a newbie when it comes to this... May I ask where in the DS-1 schematics is the FETs that is connected to the FLIP FLOP circuit? How would I check if it was the problem and may I ask if the FETs is the faulty one, what could be the proper thing to do to resolve this?
Btw, This pedal (My DS1) has been modded more than a year ago (by me) and it worked just fine for more than a year... but I noticed lately the distortion is bleeding thru my cleans. I'm not an electronic engineer and I got the mods out from the melanhead mods (diystompboxes.com)... Again there was no problem w/ the mods cause' for more than a year it worked just fine but not until a week ago is when this problem starts to occur.
here is the link for the DS1 schematics:
http://www.godiksennet.com/images/sch/DS1PG2.jpg |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/02/2007 : 15:52:59
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Hi rschua
If you modded it, open it up and recheck your solder joints, especially where you added or removed the mod components.
Your solder joints may have been of poor quality, as in (Dry Joints),
perhaps a component has come loose,
or a PCB track has cracked or broken.
My best guess, is that your soldering has caused some problem, that is now starting show itself.
I would suggest you have a Technically minded friend have a look at it, seeing that you don't really have all that much electronics experience.
You will find a lot of schematics at:
http://www.freeinfosociety.com/electronics/schempage.php?cat=1
The DS-1 is there under Boss DS-1. but it's not complete.
The 2 page service manual is here:
http://www.godiksennet.com/default.asp?main=Schematics
Check all your old mods, use a magnifying glass, you might find it's a simple fault.
Good luck.
Regards Dr. Bob
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rschua
Copper Member
Philippines
34 Posts |
Posted - 04/02/2007 : 16:25:35
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| Let me fire up my soldering iron and let me check my old soldering maybe there was some connections that comes loose... Hopefully may that solve the problem. Thanks for this info... |
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rschua
Copper Member
Philippines
34 Posts |
Posted - 04/03/2007 : 09:51:37
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Ei, I got it... it was the Q7 Fets that is acting up... There was a solder lead stucked between the emitter and the collector leg on the FETs. I used the magnifying glass as Dr. Bob said and removed the stucked lead on the FETs legs and voila... No more noise on my clean...
Thanks,
Chad |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/03/2007 : 12:18:47
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quote:
Originally posted by rschua
Ei, I got it... it was the Q7 Fets that is acting up... There was a solder lead stucked between the emitter and the collector leg on the FETs. I used the magnifying glass as Dr. Bob said and removed the stucked lead on the FETs legs and voila... No more noise on my clean...
Thanks,
Chad
Hi rschua
I'm glad to hear that you repaired the pedal, and that all is now well with your DS-1
(Modded - with optional extra solder blob-lead on Q7 FET..  )
Just for your information, FET's have a Gate-Source-Drain and not Base-Emitter-Collector.
So I think you meant, that there was a solder blob, between the Source & the Drain on the FET.
This is why you were getting the symptoms of a leaky FET, as some signal was passing, through the Solder Blob.
I'm glad you found the time, and had the patience to find the fault yourself.
Not to mention saving some money, by not going to a service shop.
Next time you're in Australia, you owe me a coffee & a 
And I like good quality chocolate.
It always makes my pedals sound way better.
Enjoy your fixed DS-1.
Regards Dr. Bob
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 04/03/2007 : 17:23:12
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What do you think of the Melanhead mod, Im debating between a Keeley one and Melanheads?
Was it a loose peice of wire floating around? Lucky it didn't short any thing out and kill it, or if its a solder ball, they can roll around under ICs and get stuck.
Dr.Bob, is a "dry joint" the same as a "cold solder"
filmy grey, and poor solder connection?
just the words make me think they are |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/03/2007 : 18:03:46
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quote:
Originally posted by ChristoMephisto
What do you think of the Melanhead mod, Im debating between a Keeley one and Melanheads?
Was it a loose peice of wire floating around? Lucky it didn't short any thing out and kill it, or if its a solder ball, they can roll around under ICs and get stuck.
Dr.Bob, is a "dry joint" the same as a "cold solder"
filmy grey, and poor solder connection?
just the words make me think they are
Hi ChristoMephisto, rschua & Guys
Yes they are the same thing,
effectively, they are electrically & mechanically faulty solder joins.
They look very crystalline, when viewed with a magnifier, but if you're young, and your eyesight is still in good condition,
You should see them with (your) the naked eye.
These days, I use a small 3 times magnifier (jewelers Lope)
Any chance, that you guys could send me the details of the Melanhead mod? or any other mods you might have.
What does the Melanhead mod sound like?
Hey rschua, next time you play live & use your DS-1,
remember to play a song for Dr. Bob.. 
Regards Dr. Bob |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/04/2007 : 15:55:37
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quote:
Originally posted by ChristoMephisto
Here you are Dr.Bob
http://www.diystompboxes.com/smfforum/index.php?topic=32443.0
and this one is a combo of Keelys and Melanheads
http://diy.erikhansen.net/ds1.htm
I work in hi-tech, good to know another soldering term if I get a job i Australia,
Hi ChristoMephisto
Thanks ....
The Melanheads DS-1 mod sounds Bloody fantastic.
I have a couple of DS-1's, I might do the mod on one of them.
Although, they don't tend to say which version of the DS-1, they are modding.
I tend not to do any mods, but after hearing the Melanheads Mod, I might have changed my mind-opinion.
I gather the Melanheads DS-1 mod was based on another very popular DS-1 mod, was it the Keeley - Indy Mod?
I'm still reading the 7 pages of thread.
Have you done any of these mods?
Thanks again ...
Regards Dr. Bob
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 04/05/2007 : 10:24:06
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Part Keelys, and part from the Indy-guiatist book on effect modding.
Think its safe to assume they are modding mits, then again ots only the opamp thats different.
I did the Melanhead mod tonight at work, took only 45 min. I love having access to a solder-sucker and pro solder tools. Altho I think i dropped a couple peices at home, some are missing. Easy fix when I get home. Still waiting on the silver micas via snailmail. Should only take about 10 days to cross the US border.
Glad you liked the link. One thing I did notice, if you don't use a LED or jfet at the clipping, don't change R13. I commonly read they switched back to stock 4.7K and they still have Ge or Si diodes.
Don't know if its related or not.
Good luck |
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rschua
Copper Member
Philippines
34 Posts |
Posted - 04/15/2007 : 20:54:11
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Hello there Dr. Bob, Been busy lately that's why I haven't checked the forum... Guess I owe you one for this...  It's a cool pedal especially w/ the Melanhead mods. It has more bass, More Gain and a good dynamics than the stock pedal. Thanks for taking some time to reply on my inquiries... cheers... |
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Topic |
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HELP: BOSS DS1 dist. bleeds in my clean
