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GOT IT!!!!!! AAARGH! I forget the ground connection at the mod switch. AND I didn't wire the switch anyways because stupid me thought (because I overlooked the ground connection) the switch wouldn't be necessary for the calibration routine....
It is calibrating atm. I'll get back later!


It works. That is soo cool!

Thanks a heap for your work and sharing, Marshall Arts!

Hi,

I finally came 'round to populate my PCB for this project, hooked it up to a working Deep-Blue-Clone and ran into some troubles. As soon as I connect the calibration wire 1 to the output (or to the input for that matter) the delay falls quiet.
Here's my copied schematic -  do you spot any mistake? Or some help in term of troubleshooting? If I cannot use my audioprobe I am lost. R400 is 10k.

Thanks!!




EDIT:

I went through the instructions again. I don't really get what this SPDT does there. I didn't populate the R18 and soldered the CTRL cable from the TAPRECISE directly to pin6 of the pt2399. Good?

Hey! I wast just pointed to this fantastic project whilst looking for a Taptation-Chip. Now I stop wondering, why the Taptation seems to vanish from most stores.

This here is brillant (I really hope I'll get it to work, unfortunately I'll have to wait some time to get the parts beacuse the digipots are not readliy available in my usual stores).

Thanks a LOT for sharing this freely and keeping the DIY spirit alive.

I should think it'd be fine as designed for bass, the signal caps are quite large already and dry signal is always mixed in.

Perhaps increase C1 to 220nF.

pin 4, negative to pin 11.

Thanks very much for your input Scruffie. I realized that there is not much bass loss to be expected from the filtering in the circuit. However, *I think* the depth pot determines the amount of dry signal mixed to the delayed one, and thus creating the chorus sound .If I dial in an especially crazy sound yet want it to be more subtle or less deep, a dry-blend feature is helpful. I finished my built and included this feature and really like the result.

Hello madbeaners,

I am planning to build a Gravity Wave for Bass use. Would you recommend a dedicated blend feature or could you estimate the bass loss if the circuit is kept as it is and the "Depth" knob does all the blending work?

Thanks for your help, Lars

I'd really like to build this AC-Tone as well. Could someone kindly re-post the PCB-Layout? And explain that "[attachment deleted by admin]" message?
I'd be most thankful.

Best regards, Lars