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jakplugg / twist

6hp version of Mutable Instruments Warps
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Calibration keeps failing #2

Open gboxentertainment opened 4 years ago

gboxentertainment commented 4 years ago

Hello,

I am having issues calibrating my Twist module that I just built.

I try to follow the official calibration guide by patching a cable into Level 2 CV in with the other end unpatched, then I run 1V through the Level 1 CV in and press the button, but instead of fuchsia, the knob becomes a faint dark blue and the LED next to the button flashes red. Then when I run 3V into the Level 1 CV in and press the button, the LED still flashes red.

jakplugg commented 4 years ago

Sorry i can't be more help, but I am not sure why that would happen, possibly an "error message" if you are on facebook, there is a group called "pusherman's eurorack diy noobs" where you might get more help.

On 12/21/19, gboxentertainment notifications@github.com wrote:

Hello,

I am having issues calibrating my Twist module that I just built.

I try to follow the official calibration guide by patching a cable into Level 2 CV in with the other end unpatched, then I run 1V through the Level 1 CV in and press the button, but instead of fuchsia, the knob becomes a faint dark blue and the LED next to the button flashes red. Then when I run 3V into the Level 1 CV in and press the button, the LED still flashes red.

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gboxentertainment commented 4 years ago

I just did some testing by editing the firmware and rerouting the Level CVs to the Alg CV in and Param CV in jacks. What I noticed for both CVs is that +5V opens the vca to full volume and +10V closes the vca. I also noticed that your design uses two additional TL072 instead of the MCP6004 - not sure if this has anything to do with it?

Also, I have found that about a constant 3V comes of the the output pin 7 for both the TL072ACDs with nothing patched in.

Also, is it normal for the LED Encoder to not show red? I am only getting combinations of blue and green.

gboxentertainment commented 4 years ago

So I think I may have found out why its not working properly. In the BOM you have U1 and U2 as MCP6002, but on the *.dip file pcb layout, it shows TL072, which is what I have installed on the board.