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PostPosted: Sat Feb 22, 2020 10:26 am 
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When attack knob is at zero:
  • Can hear guitar for less than a second when applying a heavy amount of pressure on the strings. After less than a second, the sound cuts out completely - does not fade out.
  • When the guitar can be heard, it sounds like the dry signal. no affect on volume or tone.
  • The sensitivity knob doesn't seem to have any affect in this case.

When attack knob is above zero:
  • Sound still cuts out but lasts longer than above.
  • It only takes a medium amount of pressure to trigger it.
  • Position of the knob seems to be affecting how long the notes ring out before cutting out. I honestly can't tell if it's just in my head or not.
  • Again, when the guitar can be heard, it sounds like the dry signal. no affect on volume or tone.
  • The sensitivity knob doesn't seem to have any affect in this case.

The sensitivity knob doesn't seem to have any affect in any case.

I've gone over the thing a million times with a magnifying glass checking resistor codes and capacitor values etc. I cleaned the back of the board with alcohol. I'm out of ideas. Please help.

The odd resistor is a Vishay. I broke one of the 4.7k resistors that came with the kit. i had some of the Vishays from a different project.

I have more pictures but this only lets me upload 3


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PostPosted: Sat Feb 22, 2020 10:31 am 
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more pictures


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PostPosted: Sat Feb 22, 2020 11:40 am 
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Did you adjust the trim pot per the instructions?

*edit*

quoting the manual:

"Step 4: Add the trimpot. When you are finished with your build, adjusting this trimpot will be very important. When you set the trimpot, you want to have the attack knob turned full turn clockwise so that it should produce the slowest swell. Then adjust the trimpot to the sweet spot where you get a smooth, slow swell, but not too much volume loss."


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PostPosted: Sat Feb 22, 2020 12:08 pm 
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mmarsh wrote:
Did you adjust the trim pot per the instructions?

*edit*

quoting the manual:

"Step 4: Add the trimpot. When you are finished with your build, adjusting this trimpot will be very important. When you set the trimpot, you want to have the attack knob turned full turn clockwise so that it should produce the slowest swell. Then adjust the trimpot to the sweet spot where you get a smooth, slow swell, but not too much volume loss."
adjusting the trim pot made no difference

Sent from my SM-N950U using Tapatalk


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PostPosted: Mon Feb 24, 2020 12:02 pm 
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Can you please take voltage readings for the op amp?

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PostPosted: Mon Feb 24, 2020 12:15 pm 
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byoc wrote:
Can you please take voltage readings for the op amp?

In case you're not sure how to do that:

To measure the DC voltage level on the op amp pins, set your multimeter to the DC voltage mode; use the 20VDC range setting if it's not an auto-ranging meter. Your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to the point that you want to measure. See image below for the numbering of the pins. Report your results here.

Image

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PostPosted: Wed Feb 26, 2020 2:55 am 
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duhvoodooman wrote:
byoc wrote:
Can you please take voltage readings for the op amp?

In case you're not sure how to do that:

To measure the DC voltage level on the op amp pins, set your multimeter to the DC voltage mode; use the 20VDC range setting if it's not an auto-ranging meter. Your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to the point that you want to measure. See image below for the numbering of the pins. Report your results here.

Image


thanks for the instructions


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PostPosted: Wed Feb 26, 2020 2:59 am 
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byoc wrote:
Can you please take voltage readings for the op amp?


sorry for the delay. my multimeter crapped out on me. I had to get a new one. Anyway, here's what i'm getting:

my power supply is at 9.13V
pin 2: 4.12V
pin 3: 3.68V
pin 6: 4.57V
pin 7: 8.75V


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PostPosted: Wed Feb 26, 2020 5:16 pm 
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Pin 3 is a little bit off by about a volt. What voltage do you get at pin 3 of the empty socket if you pull the chip out?

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PostPosted: Thu Feb 27, 2020 9:33 pm 
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byoc wrote:
Pin 3 is a little bit off by about a volt. What voltage do you get at pin 3 of the empty socket if you pull the chip out?
3.68/3.69V


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PostPosted: Thu Feb 27, 2020 10:15 pm 
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Yeah, pin 3 is definitely running low. With the IC in or out, I see 4.85V on mine with a power source that runs 9.95V.

What voltage do you see on the outboard side of the 220K resistor just below the Sensitivity pot connections?

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PostPosted: Thu Mar 05, 2020 9:36 am 
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duhvoodooman wrote:
Yeah, pin 3 is definitely running low. With the IC in or out, I see 4.85V on mine with a power source that runs 9.95V.

What voltage do you see on the outboard side of the 220K resistor just below the Sensitivity pot connections?
3.69VImage


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PostPosted: Thu Mar 05, 2020 11:17 am 
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You might have something causing a minor short. Is that pet hair all over your PCB? Maybe try cleaning the flux off with some isopropyl alcohol and removing all the foreign debris.

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PostPosted: Thu Mar 05, 2020 11:46 am 
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Seems like a long-shot, but possibly a leaky C9 cap (.022 uf) between IC pin 3 and the Sensitivity pot?

Image

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PostPosted: Thu Mar 05, 2020 5:36 pm 
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byoc wrote:
You might have something causing a minor short. Is that pet hair all over your PCB? Maybe try cleaning the flux off with some isopropyl alcohol and removing all the foreign debris.
I gave it another good cleaning. it's still not doing anything. it just sounds like straight guitar signal. the only exception is when the attack is all the way down it sounds heavily gated. but, as soon as you turn it the slightest bit, it goes away.


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PostPosted: Thu Mar 05, 2020 5:37 pm 
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duhvoodooman wrote:
Seems like a long-shot, but possibly a leaky C9 cap (.022 uf) between IC pin 3 and the Sensitivity pot?

Image
is that something I can test or would I need to try another cap?


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PostPosted: Mon Mar 09, 2020 10:54 am 
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natezaps wrote:
duhvoodooman wrote:
Seems like a long-shot, but possibly a leaky C9 cap (.022 uf) between IC pin 3 and the Sensitivity pot?
is that something I can test or would I need to try another cap?

If it was me and I had a spare .022uf cap on hand, I'd probably just replace it. You could also try checking the resistance across the cap, but that's not a reliable measurement with the cap installed in the circuit. So if you're removing it anyway to measure it, why not just replace it?

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PostPosted: Tue Apr 14, 2020 12:30 pm 
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duhvoodooman wrote:
natezaps wrote:
duhvoodooman wrote:
Seems like a long-shot, but possibly a leaky C9 cap (.022 uf) between IC pin 3 and the Sensitivity pot?
is that something I can test or would I need to try another cap?

If it was me and I had a spare .022uf cap on hand, I'd probably just replace it. You could also try checking the resistance across the cap, but that's not a reliable measurement with the cap installed in the circuit. So if you're removing it anyway to measure it, why not just replace it?
sorry for the long delay. I've had a heck of a time adjusting to the stay home orders.

anyway, I found a couple of these in my stash. would they work alright to test this? they are at least twice the size of the capacitors that came with the kit. I'll need to attach some wire to extend the leads.


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PostPosted: Tue Apr 14, 2020 8:17 pm 
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Got a photo? Maybe next to a dime to be able to judge the size.

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PostPosted: Thu Apr 16, 2020 9:49 am 
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I went ahead and tried it out. I'm getting a result. it's doing something now but still isn't right. it's acting like a gate. there is no ramp up. it's either on or off depending on where the sensitivity knob is set. the attack knob doesn't seem to do anything I can hear. and the trim pot inside doesn't seem to do anything I can hear. step forward?

Image


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PostPosted: Wed Apr 29, 2020 4:30 pm 
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byoc wrote:
You might have something causing a minor short. Is that pet hair all over your PCB? Maybe try cleaning the flux off with some isopropyl alcohol and removing all the foreign debris.
have you got any suggestions for me to diagnose the problem? I only have a basic knowledge of electronics. I've assembled kits before but this is the first problem I've had with one.


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PostPosted: Wed Apr 29, 2020 5:31 pm 
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Have you reflowed all of your solder joints yet?

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PostPosted: Wed May 13, 2020 11:26 pm 
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byoc wrote:
Have you reflowed all of your solder joints yet?
that didn't change anything for me. unfortunately, it's still acting exactly the same.


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PostPosted: Sat May 16, 2020 11:16 am 
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duhvoodooman wrote:
Got a photo? Maybe next to a dime to be able to judge the size.
have you got any other ideas for me to try?


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PostPosted: Mon May 18, 2020 11:05 am 
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Do you have a signal tester?

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