Electric Druid Tap Tempo Tremolo

6/26/2014

This is a very cool and versatile tremolo by Electric Druid. The signal path is taken from the Tremulus Lune, but the LFO is replaced with a digital chip with tons of features: Tap Tempo, 8 different waveshapes (even a random shape!) and a multiplier function. If you are new to digital chips that require code, read more in my Guitar to MIDI post. Have a look at my finished build here.

Read more about this project and download the HEX code or buy the PCB/pre-programmed chip-kit here: http://www.electricdruid.net/index.php?page=projects.taplfo

I also drew up this layout with only the LFO, Figured it might come in handy. For example to modulate the speed of a delay to create some pitchbend/chorusy effects... Hmmm, wonder how that random waveshape will sound. :o) I have not built this one yet, but it should be ok. Hook up A and B to any pot you want to modulate/replace. Use a regular LED and wrap it in heatshrink or tape with the LDR or use a vactrol. I used a VTL5C3 vactrol in my build.

10 Comments

Jordan

10/30/2016 03:01:37 pm

There seems to be a big volume drop when the tap tempo is on would you know which resistor to change to bring the volume up

Fredrik Lyxzén link

11/9/2016 07:21:08 am

Hi Jordan,
I've built this one several times and I have not experienced any volume drop. Maybe try a different LDR, or just check for the usual suspects: solder brigdes, jold joints or misplaced components. Cheers / Fredrik

Matt Roberts

4/10/2017 05:22:20 pm

Hi! I hope this doesn't sound stupid but I'm looking at this layout and your build pic and wondering exactly how veros are done. Your build looks upside down and back to front from the vero? What am I missing?

4/12/2017 04:01:45 am

Hi Matt
The vero board in my completed build is simply upside down because it suited the offboard wiring in this particular build.

The vero layout shows the top (component side), and the tracks in a x-ray fashion since they are actually on the bottom/solder side of the board. Some people mirror the image to do the cuts (red squares) on the bottom/solder side, but I usually just drill straight through from the topside with a small drillbit (then clean up the track holes with a knife to make sure they don't conduct) so that way it's not needed to mirror the image. I hope that makes sense. :) / Fredrik

4/16/2017 08:48:11 pm

Hi Fredrik.

You're a champion. Thanks for your reply. I had a feeling that may have been you're case.
Looking forward to this one.

4/17/2017 03:30:30 am

Also, can you tell me what the 20K yellow, 3 legged components are?

Cheers

4/17/2017 05:21:31 pm

Ah I see now they're trimpots! 😊

Anthony

5/6/2017 11:05:36 pm

Thanks for the layout, Fredrik! Did you ever hook this up to a PT2399?

5/15/2017 01:09:13 am

Hi Anthony,
No, sorry, I never tried this with a delay... If you try it, let me know how it works out. Cheers / Fredrik

Facundo Malacalza

7/19/2017 11:37:51 am

Hi men,
I have a question... can i use the tap-tempo section in a tremolo?

Electric Druid Tap Tempo Tremolo

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