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ADHD just True Bypass?

irvmuller

New member
So, I'm not much a fan of buffered bypass and am just wanting to go true bypass for the ADHD. I plan to not use the DPDT and just connect the spots on the PCB. However, I need to know if True Bypass is in the up or down position. Can someone tell me?
 

irvmuller

New member
I'm planning to use the ADHD on bass and so may even cut out the switch for HP/LP. I'm assuming the LP option on the switch would be down which means I would connect the top two pads.

What resistors or caps could I cut out by doing that? (If any) I tried figuring out myself from what you told me previously but couldn't figure out why we would keep R32 & 33 from before, so clearly, I've got a ways to go until I have an understanding like you about this stuff.
 

irvmuller

New member
You’re absolutely right about it not just being a low pass and high pass. Definitely holding on to it.

I noticed that you didn’t mention taking out R32 and R33. Why would we keep those? Just asking for understanding?
 

Chuck D. Bones

Well-known member
This is the buffer section
I wouldn’t leave the hp/lp (high peak & low peak) out of the circuit if I were you... a lot of people thinks that stands for high pass and low pass but it’s not a filter switch...
C8, R11 & R12 set the low-pass cutoff freq. The TONE control sets how much cut you get. It's called a shelving tone control because the amount of cut is limited by R14 & the TONE pot. The HP/LP switch also affect the overall volume, but that's just a by-product.
 

irvmuller

New member
As an alternative, isn’t the Blue Waffle basically the ADHD without the buffer?
Oh nice! I compared both and parts and the schematics do appear to be pretty similar. However, I'm not sure how the Blue Waffle will run on bass (which is what I play) but I'm familiar with how the ADHD/OCD will run on bass. I'm thinking the Blue Waffle is definitely one to try down the road.
 

manfesto

Member
Oh nice! I compared both and parts and the schematics do appear to be pretty similar. However, I'm not sure how the Blue Waffle will run on bass (which is what I play) but I'm familiar with how the ADHD/OCD will run on bass. I'm thinking the Blue Waffle is definitely one to try down the road.
The ADHD is based on the OCD, the Blue Waffle is based on a pedal that’s a known chinese clone of the OCD (Long story - a guy was buying Joyo OCD clones and repainting them to sell at boutique prices - I’m assuming PedalPCB made the board for it as a laugh), can’t imagine why one would work where the other doesn’t.
 

manfesto

Member
Looking at the schematics, it'd be pretty straightforward to mod the Blue Waffle to be essentially a true-bypass ADHD.

EDIT: took a second look and missed a few

R2 - 3K3
R3 - 1M
R4 - omit
R10 - 22K
R11 - 33K
R12 - omit
R13 - omit

C2 - 100n
C7 - 1u
C8 - 22n

OD pot - A1M
T pot - B10K
V pot - A100K
D1 - Jumper (or leave it in, apparently some versions of the OCD had this diode)
 
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irvmuller

New member
So, I've run into a hiccup. Is there any way of knowing which caps go with which spots? So, for example, if I'm using 1u on C7 but don't want to install the same part on C18, how do I tell them apart. That info isn't in the docs. Is that mapped out anywhere???
 
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