VCO panels arrived
got these today
stuffed in the bananas and sat knobs on top just to get an idea of how they will look. All the PCBs have been tested. Two VCOs with pan-pulse and sawtooth processor wave-shapers, two mixers, two LFOs, 1 VCA (with 3 input mixer) and an Envelope Generator
stuffed in the bananas and sat knobs on top just to get an idea of how they will look. All the PCBs have been tested. Two VCOs with pan-pulse and sawtooth processor wave-shapers, two mixers, two LFOs, 1 VCA (with 3 input mixer) and an Envelope Generator
4009 bleeding VCA
This is a layout for a dual VCA module. Each VCA has 6 separate inputs and outputs. All 6 are controlled by the same CV/gain pot settings. The VCAs are built around cmos 4009 inverters. The PCB is rather compact, 26 electros, 4 ICs, 6 pots and well over 100 SMD resistors in 1.3x5.5 inches. Resistors are mounted on the top and bottom of the PCB.
'Bleeding VCA' is a hint as to the ...erm... feature of this module. The overworked 4009 chips is going to suffer. Anyway it is a unique VCA, the panel will have 4 attenuable CV inputs, 2 initial gain pots, 12 AC signal inputs and 12 outputs.
'Bleeding VCA' is a hint as to the ...erm... feature of this module. The overworked 4009 chips is going to suffer. Anyway it is a unique VCA, the panel will have 4 attenuable CV inputs, 2 initial gain pots, 12 AC signal inputs and 12 outputs.
SEQUENCER PANEL
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 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
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
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
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
VCO
VCO
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!
panels
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.
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.