Wednesday, 31 August 2011


finally stopped testing new designs and actually started 'production'
The 1st panel is completed and worked straight away = nice!

A user manual for the Sequencer panel can be found HERE

The 2nd vid is by Jono

Friday, 26 August 2011

5 more

tested and working
1. Tb303 filter clone with CV inputs for Cutoff, Mod and Decay.
2. Filter based on the Arp4023 with added gain bandpass output and modded for LM13700 OTA, this also serves as a pretty decent VCO when the Q pot is set accordingly.
3. LDR based VCA, based on the one found in the Korg PS3200 and a schematic from an old Japanese diy magazine.
4. dual LFO, standard op amp based LFOs, with pots to change waveshapes
5. 5 stage resonator; an extended version of the 3 stage 555 generalised resonator found in Electronotes. It certainly works and is interesting but not entirely sure I like it yet, will probably seek a 2nd opinion

As usual, minimal wiring required

Friday, 19 August 2011

new modules tested

got a bunch of boards in this week, which distracted me from building sequencers. Just had to see if they worked.
So there is a basic envelope generator, all trannie core circuitry, just an op amp on the output to get 0-6V levels.
The crossbreed waveshaper/sequencer thing...not really sure what to call it. Feed it two VCO signals and it will divide them down by /2, /4, /8 and /16, plus AND gate various divisions from each input signal, then all of these 12 signals and the original inputs can be nulled or mixed to deliver a rather chunky output. If you feed it two slow clock signals you get a sequencer...of sorts, nothing like any other sequencer out there.
The dual mixer is simply two three input, single output DC mixers, nothing special but essential.
The VCO is as described below, haven't fully set it up yet but have had it running and it seems to work beautifully. As for wiring, not counting power lines, the Crossbreeder needs 3, EG needs 2, Dual mixer needs 8 (bugger!) and the VCO needs 0 (perfect)
So far all boards have worked fine, with no trouble-shooting or kludges at all. I had a Coopers Pale tonight!

 Crossbreeder & EG
 Crossbreeder & EG
 Dual Mixer

Tuesday, 2 August 2011


I got panels
These are raw aluminium 2.5mm, CNC'd panels, with the labels screenprinted/baked on and look great.
I like raw metal but will test one to see how it goes with a clear sealant, mainly to protect against Twistie fingers.

Thanks to PNEgraphics for doing a great job.