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PostPosted: Sun Mar 26, 2017 8:49 am 
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Location: KC MO
I have a head scratcher. I have verified caps, diodes, trans, and IC orientation.

This pedal gives noise anytime it's engaged. LED works and bypass is clean.

Any Ideas where to look?

THANKS

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PostPosted: Sun Mar 26, 2017 8:58 am 
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Start by powering the pedal with a battery. This will determine if the power supply you are using is the cause of the noise.

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PostPosted: Sun Mar 26, 2017 9:36 am 
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Location: KC MO
I have tried my iso pedal power, a regular 9 v wall wart, and I have used my regulated DC power supply on my bench. all with the same noise.

I built it without battery hookup.

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thanks for answering.

fvf


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PostPosted: Sun Mar 26, 2017 9:39 am 
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Location: KC MO
here is a zip of a mp3 recording of the noise.

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PostPosted: Sun Mar 26, 2017 1:25 pm 
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Any chance you have another dual op amp to swap in for the TL072? Any general purpose dual op amp will work for this duty. If not, try pulling and re-seating the existing one.

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PostPosted: Sun Mar 26, 2017 2:13 pm 
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Joined: Sat Sep 18, 2010 11:37 pm
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Location: KC MO
Will a NE5532 work? Also I did some more testing and the TL072 pin 8 has 8 VDC and pin 7 and 6 are clean and sound good, they scope a nice square wave. Pin 1 and 2 on the other hand are half the level of 7, 6 and sound way bad. Both pin 7 and 1 have 4.01 VDC on them.

Could it be the 2n3904 or are you leaning on the tl072 took a dump?

thanks
fvf


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PostPosted: Sun Mar 26, 2017 8:24 pm 
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Yes, an NE5532 will work fine. The IC is the most failure-prone component in the circuit, so I suggest checking that first.

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PostPosted: Sun Mar 26, 2017 9:07 pm 
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Yes and it's alive. The 5532 worked and all is well. Would you replace the 5532 with the tl072 or stay as is? The noise level is not bad at all.

THANKS again.
Fvf


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PostPosted: Mon Mar 27, 2017 9:15 am 
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Glad to hear that did the trick. Up to you whether or not you replace the 5532. If you contact sales@buildyourownclone.com and explain that you received a defective TL072, they will replace it for you at no cost.

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PostPosted: Mon Mar 27, 2017 3:18 pm 
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duhvoodooman wrote:
The IC is the most failure-prone component in the circuit,...

Just for my own learning purposes, its that generally the case in most circuits that contain an IC or just this one in particular?

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