Category: Not yet verified

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 😉

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

Trembulator with tap-tempo

I absolutely love the sound of the Baja Trembulator, so what better project to start with when it’s time to try the tap-tempo LFO micro controller?


This is a very basic adaptation; just the signal part of the Trembulator with the standard LFO circuit replaced with the micro controller (and associated components).

I kept all the multipliers, but didn’t really care for the ramp waves, and the triangle wave was very similar to the sine wave, so I decided to keep only the sine- and square wave settings.


I did try this on breadboard, so I’m fairly confident it’ll work. Will update once I’ve built it.

And if you can’t figure out how to compile and program the uC I’ll consider setting a few up and ship out for cost (depending on demand etc.)

Updated: 9 November, 2013 — 00:34

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 🙂

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

Tubetype distortion circuit

Found a small article on AMZ about some patented tube emulation circuit used in Crate amps. Jack Orman put together a simple effect schematic based on the patent information and I’m keen to find out what it sounds like.

The effect calls for +18v to work properly so I put in a standard voltage doubler. I’m curious about this one so I’m definitely going to build it (eventually), but let me know what you think if you decide to build it too.

Updated: 21 December, 2012 — 22:31

Misc utility circuits

Added various utility circuits to the “Other” category of vero layouts.

CMOS switching circuit that can be used to route an input to the input of either of three different circuits:

+9v DC regulated power supply unit. Can be updated for +18v by changing to capacitors rated 25v+ and a +18v regulator:

A standard charge pump circuit that can give you -9v. Use either alone (for those positive ground effects) or in conjunction with the +9v for bi-polar power:


A voltage doubler using either the 7660S or the MAX1044 IC. This will give you almost +18v from a +9v supply:


Same as the above voltage doubler (+9v to ~+18v), but using a higher current IC (the LT1054):


Outputs a 1000Hz sine wave with a user variable amplitude. Use for injecting a test signal when debugging:

JFET testing circuit. I used this to match transistors for the Phase 90:


Updated: 21 December, 2012 — 20:55
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