Update (01.11.2041): Fixed dead link to source. Here it is: TapTempoLfo_v2_1.zip
You might have noticed I’ve been conspicuously absent for a while. Well, I’ve been busy reinventing the wheel! Or to be more precise, I’ve been fooling around trying to improve the first tap-tempo micro controller.
So what’s the reason? Right after putting together the tap-tempo trembulator I thought I was going to put it all together in a box and call it finished, but then I went something like this. “I can finally control the trembulator using tap-tempo. Next let’s do a phaser… Hmm, I would have to tap on several different effects to set their individual tempos. This doesn’t scale well.”
The obvious answer is to have one single tap-tempo on the pedal board, and use this to remotely set the tempo on all the different effects using this chip. In order for this to work the chip needs to accept an alternate form of input that can be delivered from an external source (the central chip). Back to the drawing board.
So I came up with this, which probably doesn’t adhere to any standard, but should hopefully do exactly what I want. Seems to work great based on my limited amount of testing 🙂
As with the other source code, I’m sharing this in the spirit of DIY, and it’s not to be used for commercial purposes or posted elsewhere.
I’m currently working on a basic description/overview/usage document to go along with this, as well as some example schematics showing how to hook it up.
Next on my project list: Create version 3 using a larger AVR chip so it can have more bells and whistles! (Central tap-tempo circuit candidate).
Enjoy! And I do appreciate feedback, constructive or just positive 😉
Update (14.12.2013): Fixed a small bug the waveform fraction alignment calculations. Source code updated.
Also, here’s a first attempt at a document describing how to use the chip, as well as some example schematics.
Update (26.12.2013): Here’s a quick schematic showing different options for static voltage input selections, whether using a pot or a rotary switch.