chongmagic
Well-known member
Any issue using a 3k9 and 6k8 in place of the 3k92 and 6k81 respectively?
Disarray Distortion resistors
- Thread starter chongmagic
- Start date
They are all within 1%. You won't hear any difference. You have a lot more variation in the capacitors.
chongmagic
Well-known member
I figured so but just wanted to ask. Thanks!
@chongmagic I plan on building that soon but I plan on using the original nonreloaded values for the few cap and res changes. Do you have experience with the original riot?
chongmagic
Well-known member
No I haven't ever had a chance to play with the original.
I've built several. What do you want to know? I've seen several schematics and I can steer you to what I think sounds like the original.
cool thanks @tcpoint!
There's not a schematic for the disarray for easy reference but I was planning on using the following values
22nF vice 1.2nF & 18nF in the tone control area, along with 11k3 and 3.92k voltage divider in the same area. Not the 6.81k 3.92k combo.
And the first inverting feedback opamp loop, keep the cap at 220n vice 150nF for the reloaded.
If I understand correctly the original also used 470R in series with the Ge diode grouping instead of the 220R for the reloaded.
Does the above sound about right?
Did the original also have the first nonivnerting Vref res at 470k or 1M?
There's not a schematic for the disarray for easy reference but I was planning on using the following values
22nF vice 1.2nF & 18nF in the tone control area, along with 11k3 and 3.92k voltage divider in the same area. Not the 6.81k 3.92k combo.
And the first inverting feedback opamp loop, keep the cap at 220n vice 150nF for the reloaded.
If I understand correctly the original also used 470R in series with the Ge diode grouping instead of the 220R for the reloaded.
Does the above sound about right?
Did the original also have the first nonivnerting Vref res at 470k or 1M?
chongmagic
Well-known member
I built mine up going to test it out. The red LEDs light up but the blue doesn't. Can anyone confirm this being the case?
chongmagic
Well-known member
Dependent on the coice switch of course.
@chongmagic I'll let you know what I find but that could be right. It'll be a little bit before I get this build done.
same issue here, sounds weak, how did you fix yours?
spi
Well-known member
yes to resister values.
In earlier revisions of the board (mine was revision 05.04.20), the Blue LED is oriented in the same direction as the zener diodes, which would explain why they don't light up. At the time @PedalPCB said he'd look into it. It appears this is now corrected in the latest build doc, which is revision 6/14/21. I don't know if this correction is only to the schematic drawing in the build doc, or to the actual PCB.
I was thinking I might reverse the direction of my blue diode to see if it lights, but desoldering is always an iffy proposition--sometimes I ruin the pads. Also, I find this position sounds great, so I may not mess with it at all.
Blue LED doesn't light up in mine. I remember another thread where this was being discussed too.
In earlier revisions of the board (mine was revision 05.04.20), the Blue LED is oriented in the same direction as the zener diodes, which would explain why they don't light up. At the time @PedalPCB said he'd look into it. It appears this is now corrected in the latest build doc, which is revision 6/14/21. I don't know if this correction is only to the schematic drawing in the build doc, or to the actual PCB.
I was thinking I might reverse the direction of my blue diode to see if it lights, but desoldering is always an iffy proposition--sometimes I ruin the pads. Also, I find this position sounds great, so I may not mess with it at all.
Robert
Reverse Engineer
I haven't managed to get my hands on an original to confirm one way or another, but regardless it does make more sense for the blue LED / zener diodes to be in opposing orientation.
Desoldering an LED can be tricky, it'd be easier to just reverse D4 and D5.
The PCBs have been updated but there are still a few floating around with the older layout. Install D4/D5 in the orientation shown in the current build doc, regardless of the silkscreen on the PCB.
Desoldering an LED can be tricky, it'd be easier to just reverse D4 and D5.
The PCBs have been updated but there are still a few floating around with the older layout. Install D4/D5 in the orientation shown in the current build doc, regardless of the silkscreen on the PCB.
