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PostPosted: Fri Aug 22, 2014 1:11 pm 
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Location: Las Vegas NV
So this is an old project from a year ago i picked back up and finished over the weekend but im not too sure what the issue is. I wasnt getting any signal when the pedal was engaged at all. But i went back through a found a resistor that was in the wrong place but that didnt fix the issue. So now i turn it on, bypass works, I get signal but as soon as i engage the pedal i get nothing. But noticed i was getting very very low levels. I cranked my amp way beyond the norm and was getting faint levels but was unaffected.

Any help would be much appreciated.


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PostPosted: Fri Aug 22, 2014 1:24 pm 
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Hi - welcome to the forum! :D

What's going on with the DC jack wiring? Battery clip or something?

Do the LEDs light when the pedal is engaged?

Do you get any sound out of the aux output when engaged?

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PostPosted: Fri Aug 22, 2014 1:42 pm 
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i dont have the dc power supply hooked up as of now because Im not in possession of one so as of now just have the battery clip soldered in.
Both leds are working fine and Im getting sound when bypassed but once its engaged the level is extremely low to the point were i have to crank my amp and the signal is also uneffected by an effect.


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PostPosted: Fri Aug 22, 2014 1:44 pm 
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Morgan wrote:
Hi - welcome to the forum! :D

What's going on with the DC jack wiring? Battery clip or something?

Do the LEDs light when the pedal is engaged?

Do you get any sound out of the aux output when engaged?


And yes, AUX output is getting signal


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PostPosted: Fri Aug 22, 2014 1:49 pm 
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jmckoot wrote:
And yes, AUX output is getting signal

So, the AUX output level is normal (same level as bypass) when the LEDs are on?

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PostPosted: Fri Aug 22, 2014 1:50 pm 
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Location: Albany, NY
All of your JRC4558D op amps are installed upside down. See page 10 of the instructions and the image on page 7. The dots on the IC bodies should be up at the same end as the notch on the silkscreen outline for those six chips. Try swapping them around, although installing them like you have sometimes causes them to burn out.

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PostPosted: Fri Aug 22, 2014 1:52 pm 
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Location: Las Vegas NV
Morgan wrote:
jmckoot wrote:
And yes, AUX output is getting signal

So, the AUX output level is normal (same level as bypass) when the LEDs are on?


With both LEDS on, there is no signal through both AUX and Main Out. when the leds off (Bypassed) the signal is the same through both aux and main output


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PostPosted: Fri Aug 22, 2014 1:55 pm 
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duhvoodooman wrote:
All of your JRC4558D op amps are installed upside down. See page 10 of the instructions and the image on page 7. The dots on the IC bodies should be up at the same end as the notch on the silkscreen outline for those six chips. Try swapping them around, although installing them like you have sometimes causes them to burn out.


Ya i noticed and fixed that already, the photo is a day outdated. I figured after finding the wrong resistor as well as looking at the instructions once again. Thanks anyways. Maybe i burnt them out. how would i test these


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PostPosted: Fri Aug 22, 2014 2:03 pm 
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jmckoot wrote:
Ya i noticed and fixed that already, the photo is a day outdated. I figured after finding the wrong resistor as well as looking at the instructions once again. Thanks anyways. Maybe i burnt them out. how would i test these

Umm, that's kind of an important piece of info to leave out! Anyway....

You can test the DC voltages on the pins, if you have a multimeter. Pin 8 should be at your power source voltage, pin 4 should be at ground (0V), and the remaining six should all be within a volt or less of 1/2 the source voltage. It's possible for the voltages to check out alright and an IC to still be bad, but I'd start with this check.

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PostPosted: Wed Aug 27, 2014 4:04 pm 
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duhvoodooman wrote:
jmckoot wrote:
Ya i noticed and fixed that already, the photo is a day outdated. I figured after finding the wrong resistor as well as looking at the instructions once again. Thanks anyways. Maybe i burnt them out. how would i test these

Umm, that's kind of an important piece of info to leave out! Anyway....

You can test the DC voltages on the pins, if you have a multimeter. Pin 8 should be at your power source voltage, pin 4 should be at ground (0V), and the remaining six should all be within a volt or less of 1/2 the source voltage. It's possible for the voltages to check out alright and an IC to still be bad, but I'd start with this check.


So turns out i did blow out my JRC4558 ics and I replaced them all. Seemed to solve majority of the problems. Sounds great but the stabilizer doesn't seem to track octaves properly, almost like delayed then the it goes away. Sounds fine with it disengaged but I read that it sometimes doesnt work properly due to impedance, output, or frequency range (in the manual) so not too sure. But my biggest concern is that the tone potentiometer has little to no effect on the signal.


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