Also does anyone know the max voltage for the psycho knob? Artec website says it can work down to 5V but no max is given. My amp can use 8-18V.
Paul Craig > Fergus LesterJanuary 31, 2020 at 1:07pm
I lost the paper that came with mine while moving, but I believe the operating voltage is 9V to 12V.
Use 2 9volt batteries in parallel for longer use or a 9volt Walwart with a high milliamp rating(800ma or higher). Walwarts can sometimes cause RF noise in your amp though.
Hope its OK to resurrect this thread. I installed the psycho knob in my amp and yes it does suck a battery dry pretty quickly when its shared with the power amp. Especially on the highest setting which gives me a nice lo-fi fuzz effect, albeit noisy. Works better with an external power supply bit still noisy.
Just wondering if I use separate batteries, will the power amp still work in bypass mode if the psycho battery is dead?
I've done a bit of looking around and found these drawings, it gets us a bit closer.
bizzaro guitaro > Pickedmoor JonSeptember 19, 2017 at 5:18am
Cool,where did you find these? Thanks for your interest in this project. I must have done something wrong in my wiring. I still can't get it right. It did work when I first plugged it in though.
Okay, I found a pic of the board. The Level knob is a little block with a set screw to set at one level and leave alone.
If you were good at hacking and soldering without destroying a board, you could remove that block and wire in a pot for extra adjustment benefit.
On the back of the board, there's 3 points to solder the block in. You could remove the block and solder wires there for a pot. Find the ground first and run that to the back of the pot and the 3rd lug. Then just wire up the other 2 to the 1st and 2nd lugs. If it doesn't work well, reverse the 1st and 2nd lug wires and it should work fine. You would probably need a B2k to B10k pot.
I'm an electrician but not great with electronics yet. I'm also from the UK so we call things by different names, let me see if I get what you are saying. Remove the 10 Kilo ohm variable resistor from the QDD2 board, solder wires from those connections to a new pot of the same value. This will adjust the distortion intensity rather than having a fixed intensity on the overdrive setting of the psycho knob (QDD2), have I got that right?
On a basic electronics question (as I said I'm a newbie to electronics). A VR or pot has 3 legs, the Input, the fixed Output and the Wiper (variable value resistance) What would the Ground be connected to? I can see that you want an adjustable voltage/amperage so that takes care of the input and wiper but what is the third leg for? Is the ground just for attaching to the chassis of the pot to the QDD2 ground or Guitar?
Thanks in advance to any and all who can help.
Paul Craig > Pickedmoor JonSeptember 7, 2017 at 2:29pm
Your simply replacing a fixed resistor with the variable type.
The ground goes to lug #3(looking at the bottom of pot-lug will be the one on the far left) which also usually gets grounded to the back or side of the pot and added to the guitars ground circuit.. The far right lug is #1 is signal in. The middle lug #2 is the wiper.
BTW: if your a lefty - change out lugs #3 and #1 for ccw rotation.
Hope that helps. The fixed position might be best, try it first. Then If you would rather be able to adjust for certain use, you know how to do it. Cheers
It's basically a effect circuit. And most guitar with onboard effects are wired after the pickup vol/tone controls like the way pedal effects come after the pickup controls(if any).
I'm starting to think that wiring the effect before the vol/tone controls would change the level/intensity of the effect more than the pickup, which isn't a bad thing. I see on the schematic that Pickedmoor Jon posted, that there's a area at the bottom labeled: Level. That would be an ideal place to add a Level/Intensity pot to control the strength of the effect in the circuit. That way you could adjust the pickup with your original controls and possibly adjust the effect.
I'd love to see a detailed pic of one of these.
I would disconnect the wires at the jack on your guitar, solder/attach them to the effect and then wire from the effect's output to the jack. Then if you could add a pot for the level, that would be awesome.
Replies
I lost the paper that came with mine while moving, but I believe the operating voltage is 9V to 12V.
Use 2 9volt batteries in parallel for longer use or a 9volt Walwart with a high milliamp rating(800ma or higher). Walwarts can sometimes cause RF noise in your amp though.
Just wondering if I use separate batteries, will the power amp still work in bypass mode if the psycho battery is dead?
I've done a bit of looking around and found these drawings, it gets us a bit closer.
If you were good at hacking and soldering without destroying a board, you could remove that block and wire in a pot for extra adjustment benefit.
On the back of the board, there's 3 points to solder the block in. You could remove the block and solder wires there for a pot. Find the ground first and run that to the back of the pot and the 3rd lug. Then just wire up the other 2 to the 1st and 2nd lugs. If it doesn't work well, reverse the 1st and 2nd lug wires and it should work fine. You would probably need a B2k to B10k pot.
Hi Paul
I'm an electrician but not great with electronics yet. I'm also from the UK so we call things by different names, let me see if I get what you are saying. Remove the 10 Kilo ohm variable resistor from the QDD2 board, solder wires from those connections to a new pot of the same value. This will adjust the distortion intensity rather than having a fixed intensity on the overdrive setting of the psycho knob (QDD2), have I got that right?
On a basic electronics question (as I said I'm a newbie to electronics). A VR or pot has 3 legs, the Input, the fixed Output and the Wiper (variable value resistance) What would the Ground be connected to? I can see that you want an adjustable voltage/amperage so that takes care of the input and wiper but what is the third leg for? Is the ground just for attaching to the chassis of the pot to the QDD2 ground or Guitar?
Thanks in advance to any and all who can help.
Your simply replacing a fixed resistor with the variable type.
The ground goes to lug #3(looking at the bottom of pot-lug will be the one on the far left) which also usually gets grounded to the back or side of the pot and added to the guitars ground circuit.. The far right lug is #1 is signal in. The middle lug #2 is the wiper.
BTW: if your a lefty - change out lugs #3 and #1 for ccw rotation.
Hope that helps. The fixed position might be best, try it first. Then If you would rather be able to adjust for certain use, you know how to do it. Cheers
It's basically a effect circuit. And most guitar with onboard effects are wired after the pickup vol/tone controls like the way pedal effects come after the pickup controls(if any).
I'm starting to think that wiring the effect before the vol/tone controls would change the level/intensity of the effect more than the pickup, which isn't a bad thing. I see on the schematic that Pickedmoor Jon posted, that there's a area at the bottom labeled: Level. That would be an ideal place to add a Level/Intensity pot to control the strength of the effect in the circuit. That way you could adjust the pickup with your original controls and possibly adjust the effect.
I'd love to see a detailed pic of one of these.
I would disconnect the wires at the jack on your guitar, solder/attach them to the effect and then wire from the effect's output to the jack. Then if you could add a pot for the level, that would be awesome.
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