Valhalla won't turn on

[El_Patator61]

Hi,
Just finished my build and I my pedal won't turn on! I checked the wirings, try to switch some wires etc but it still doest work.
Maybe someone could give me a hand with this

 

[El_Patator61]

 

[dlazzarini]

For starters I think you’ve got your input and output jacks wired wrong. Also check your power Jack. It should be center negative which means that your negative/ground wire should be connected to the center pin terminal

 

[El_Patator61]

Ok so I rewired everything today and it works !!!! I struggled but it sounds great now. Thanks a lot for your help
I have a last question, since I bought a pre-made kit for this PCB I didn't receive any "C25k"pot but only "B25k" (the other pots are correct), are C25k and B25k the same and if not, is it a problem ?

 

[dlazzarini]

This is not my area of expertise as I’m at maybe intermediate level. These pots have the same resistance but different tapers. The “B” taper is linear. If you were to look at a graph, the line would be a 45 degree straight line. “C” taper is reverse log. Same as “A” taper except reversed. It will behave differently. Not saying it won’t work because it may. The sound will change at different locations as you turn the pot. Hopefully someone with a little more expertise will chime in.

 

[zgrav]

you will get the same sounds across the range of a B taper pot that you would with an A taper or a C taper. The B taper is linear, so 50% of the change takes place in the first half of the rotation, and 50% in the back. The other tapers shift some of the range so that one-half turn of the pot gives you more control over a smaller percentage of the change in the resistance, and the the other side of the pot gives you bigger changes in resistance for a smaller part of the rotation of the pot. That is usually done to give you more fine-tuning over either the lowest or the highest part of the rotation. In general, using a B taper pot will work fine.

 

[Betty Wont]

C25K are hard to find. C20K is a better sub than B25K for the C25Ks in this circuit. The Deep and Pres bunch up badly on the rotation with linear pots.

 

[zgrav]

C25K are hard to find. C20K is a better sub than B25K for the C25Ks in this circuit. The Deep and Pres bunch up badly on the rotation with linear pots.

everything is relative. I would certainly use the c20K over a b25K if I had it, but someone with an all-parts-included kit might not want to wait and pay to order the part as a separate order.

 

[Betty Wont]

I didn't even know there were kits...

 

[fig]

You could use a greater than or equal to C50 and bridge a resistor across 1-3.

but....now I understand...it was die Ausrüstung

 

[peccary]

I didn't even know there were kits...

Musikding sells lots of kits from different PCB makers in Europe, that would be my guess.

 

[El_Patator61]

I didn't see all the replies ! Thanks a lot guys !!
Yeah I bought my kit from Musikding

Otherwise my pedal now works, but there is a huge high-pitch sound when I leave the pedal on without playing anything. It happens as soon as I set the volume a little too high (I set the gain at the maximum). Do you have an idea of where this could come from ? Just to be sure I didn't make an error again ^^

 

[Kroars]

I didn't see all the replies ! Thanks a lot guys !!
Yeah I bought my kit from Musikding

Otherwise my pedal now works, but there is a huge high-pitch sound when I leave the pedal on without playing anything. It happens as soon as I set the volume a little too high (I set the gain at the maximum). Do you have an idea of where this could come from ? Just to be sure I didn't make an error again ^^

I believe that was corrected on the latest version that was released. IC4 was changed to L78L12 (can’t remember what the previous one was but I believe it’s what you have installed). In other words I believe your board is working as it was intended on the earlier pcb design which is what you I think you have there. You may be able to just change it to an L78L12 as I think that was the only change but I’d get clarification from someone more in the know than I before you do.

edit: check this out, looks like you may be able to stick an L78L12 in there after all:

https://forum.pedalpcb.com/threads/valhalla-ic5.5862/