Update: my pedal chain now has seven self-built pedals on it, with another one (something "completely" new) waiting to be boxed up.
I'm completely happy with the OK now, which is where it all started, plus an Electric Brown, Parallel Universe and Hyperion 2.
I've also got the Random Number Generator and Finish Line built, but I'm still tinkering with them as I feel they're not quite there yet, though they both work ok.
Last of all is the Happy Little Accident which is a spin off of the OK, which I still like a lot.
The new one is a further exploration of a cut-down OK circuit which I called a Teeny Tiny Fuzz - it wasn't anything spectacular but it worked
I made another Teeny Tiny Fuzz board, but without the first pot and its two capacitors - cutting things down even more, then connected that to the original board. I've drawn up a vero layout for it (on paper, which is the best I can manage for now) which looks like this:
I started with both of the transistor pairs identical, but there was a lot of noise so after some swapping settled on the pairings above.
The "Fat" control goes from bright and a little less full through "a bit of a starved sound if you play lightly" to a fatter fuller sound when full up.
The big thing about this is that no matter where the Fat control is, it needs a reasonable amount of signal to work so chugging chords can easily be separated from each other, which is the bit I like about it. Once the signal drops the output cuts out completely so it has its own noise gate built in.
It's not the greatest thing in the world, but I like the sound of it and as my aim was to build something with a fairly small number of components I consider it a success
I'll post some sound clips once I've boxed it up.