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smsesp2
Copper Member
Philippines
4 Posts |
 Posted - 12/08/2008 : 14:21:43
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| Hello, I have a BOSS DS-2 Made in Japan and it has a problem: it produces loud hum noise when I turn on the distortion (not in bypass/clean mode, all parameters are set to max and the mode is set on Turbo Distortion Mode). My whole gear setup is the guitar, cables, distortion and amp. I checked if the cables, guitar or amp have the problem and the result was there were no loud hums nor any noise produced (no problems) on the cables, guitar and amp. I use a generic adaptor for the power of the distortion. Although I have a schematic diagram which I retrieved from the other topics of the forum, it might take time to for me to review the subject regarding it which is electronics. Please help and Thank you for your kind consideration. Sincerely, Smsesp2. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 12/08/2008 : 14:30:22
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Hi smsesp2
Welcome to the forum from Australia.
It sounds like your generic adapter is not a regulated type.
That's probably where all the hum is coming from.
Regulated power adapters, (like the PSA) or home made ones, have a 3 pin, LM7809 Voltage regulator IC in them.
This IC is also designed to filter out all the ripple on the 9V supply lines.
They typically have hum rejection ratios of over 100dB. (very Quiet)
I am guessing that the DS-2 works fine with a good 9V battery.
Your generic adapter probably only has, 2 or 4 diodes, & a 1000uf filter capacitor.
Let us know, if this is correct.
We also have a few other members here from the Philippines.
Good Luck
Regards Dr. Bob |
Edited by - Dr. Bob on 12/08/2008 14:31:26 |
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smsesp2
Copper Member
Philippines
4 Posts |
Posted - 12/08/2008 : 14:37:59
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quote:
Originally posted by Dr. Bob
Hi smsesp2
Welcome to the forum from Australia.
It sounds like your generic adapter is not a regulated type.
That's probably where all the hum is coming from.
Regulated power adapters, (like the PSA) or home made ones, have a 3 pin, LM7809 Voltage regulator IC in them.
This IC is also designed to filter out all the ripple on the 9V supply lines.
They typically have hum rejection ratios of over 100dB. (very Quiet)
I am guessing that the DS-2 works fine with a good 9V battery.
Your generic adapter probably only has, 2 or 4 diodes, & a 1000uf filter capacitor.
Let us know, if this is correct.
We also have a few other members here from the Philippines.
Good Luck
Regards Dr. Bob
Hi, I want to say thank you for the immediate response and I will try it out. Thanks again.
Sincerely,
smsesp2 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 12/08/2008 : 15:00:39
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Hi smsesp2
No problems.
Are you any good with soldering & some electronics, you could make an external regulator, to fit to your generic adapter.
Maybe put it in a small plastic project box, & fit the LM7809 with a small heatsink.
Be careful with your unregulated adapter, they can put out a lot of extra volts, than what is marked on them.
Some cheapo unreg. 9V adapters, can put out, up to 16 or more volts.
Good luck Dr. Bob |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 12/08/2008 : 15:28:15
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All I can add is that a distortion unit with "ALL PARAMETERS SET TO MAX" might add more noise than seems reasonable. How does it perform with the setting rolled back? Not on Turbo mode?
Good luck, and welcome! |
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Mesjoggah
Gold Member
Netherlands
595 Posts |
Posted - 12/08/2008 : 16:50:17
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quote:
Originally posted by verivorax
All I can add is that a distortion unit with "ALL PARAMETERS SET TO MAX" might add more noise than seems reasonable. How does it perform with the setting rolled back? Not on Turbo mode?
Good luck, and welcome!
i'm pretty sure it is because of all knobs set at their max that causes the hum, you need a NS-2 to kill the hum. |
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Dirk
Platinum Member
Netherlands
1309 Posts |
Posted - 12/08/2008 : 17:44:23
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Or a cleaner tone  |
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smsesp2
Copper Member
Philippines
4 Posts |
Posted - 12/09/2008 : 06:43:03
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Thanks for all your responses, I'll go with the "good 9V battery" solution because I do not know the schematics of the generic adapter I have, and the battery connector has been cut and only the two wires were left, I will try to solder a new connector but it may be hard to desolder the original wires because I've never seen how boss soldered the wires if it is too hard to remove (I will check this out). Then I'll be buying a 9V rechargeable battery like energizer, and also I will be having an NS-2 next year. Thanks again really appreciated all of you.
Sincerely,
smsesp2 |
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smsesp2
Copper Member
Philippines
4 Posts |
Posted - 12/09/2008 : 07:03:03
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I've seen the inside of the pedal and it seems hard to reach the black wire end (where it is soldered) so I'll not be desoldering or removing the old wires but I'll connect a new battery connector instead. Thanks.
smsesp2 |
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Dr. Bob
Moderator
Australia
6593 Posts |
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Topic |
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Problem: BOSS DS-2 produces loud hum noise when on
