Category: Other

Tap-Tempo Clock

Update (25.04.2016): The new version (v2) is up and running, and I’ll try to share as much as possible on github.

Source code


Example schematic (not yet verified)

Update (09.07.2014): And here’s the new vero layout! Unfortunately I haven’t verified this one as I patched my original, faulty board rather than creating a new one. But I have looked it over and it should be good ๐Ÿ˜‰

For those few of you interested in building this for yourself, I’ll try to stock the shop section with a few pre-programmed Tap-Tempo Clock chips as soon as the empty ones I ordered arrives. If possible I’ll also include a 20-pin DIP socket and the 8MHz crystal.


Tap-Tempo Clock box keeping my tremolo sync’ed.

TapTempoClock in action (more…)

Updated: 25 April, 2016 — 23:05

Relay switching using microcontroller

Today’s post is unfortunately going to be more of a tease than a practical layout.

I’ve been experimenting with programming micro controllers the last few days (AVRs to be specific) and I thought a good starting project would be to try operating a latching relay switching circuit with this instead of the CD4069. And hopefully the result will have a smaller dimension too.


Pretty basic stuff, I know, and I probably forgot something too, but I have breadboarded this and verified that the circuit and controller works.


I have yet to verify the actual vero layout though, but will probably do so pretty soon.

Now, I wish I could share this with you all, but even if I put up the AVR binary so you could download it there’s still the issue of having to program it onto the chip. I’m open to suggestions. If there’s any interest, let me know.

Update (01.04.2013): Works great ๐Ÿ™‚

Update (11.10.2013): I know I promised this a long time ago, but better late than never. Here is the source code for the ATTiny85 micro controller used in this vero layout.


Now, this is meant for DIY-use only, no profiting! I’m not going to explain how you compile this and tank the micro, that’s totally outside the scope here. If there’s enough interest I might consider prep’ing some micro’s and mailing them out at cost. We’ll see.

Updated: 12 October, 2013 — 01:41

LoFi Telephone Noise, take two

I did a layout for R.G.Keen’s LoFi Telephone Noise already, but with Mark Hammer mods and the noise part removed. I wanted to revisit the effect and keep the noise part as an option this time around.

After having built it I had problem getting any noise out of it at all and ended up tacking on a different “white noise” circuit snippet instead.

I don’t think the white noise blended with the signal sounds entirely convincing, but it’s an interesting effect none the less. And there’s a lot of noise on tap if you’d want it ๐Ÿ˜‰

I was able to single out a single 2N2222A transistor for the noise source that was acting a lot noisier than the rest of the lot.

Updated: 21 December, 2012 — 22:39

Splitter Mixer

This is a utility pedal I’ve been planning to do for a long time. I based this heavily on the “splitter blend” project off runoffgroove, but instead of splitting into two send/return paths I wanted only one loop and the ability to mix this with the dry signal. Since this left me with a spare opamp stage I decided to use this in place of the source-follower in the phase switch section. Thus the schematic ended up looking like this.

And the vero layout to go with it.

I plan on sticking two or three of these in an enclosure with separate 3PDTs and LEDs for each loop. Let me know if you beat me to it and build this, and whether you made it work or not.

Update (16.08.2012): Built this last night and it works. I’ve also corrected a minor mistake on the layout (IC1 said TL072 and not TL074).

Updated: 16 August, 2012 — 15:30

Sine Wave Generator

Here’s a layout for a useful, but different kind of circuit. The Valve Wizard has several cool designs/projects on his site and this one should be a great testing tool you can use to generate a test input signal with. I’m building this one ๐Ÿ™‚

Update (09.09.2012): Built this a while ago and couldn’t make it work at all. Bummer…

But then I fooled around a bit and figured out that if I disconnected the 2nd pole of the rotary from the circuit everything sprang to life and it worked as expected. Now this would effectively remove C4, C5, C6 and C8 from the circuit altogether, and I’m not sure how this works. I.e. I’m reluctant to call this one verified, but if you do build it and can’t make it work try connecting only “Range SW 1 center” and leave “Range SW 2 center” disconnected. Wish I knew more on the theory at work here…

Updated: 21 December, 2012 — 22:34
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