Sunday, August 29, 2010

Hellfire on PCB!

The PCB is moving foward at a bit more of a pace. Still need to fit all the passives and source the main transformer and sort out the front panel.
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Monday, August 23, 2010

Hellfire here we come!

My Valves arrived today! These are to go ito the Metasonix TS-21 Hellfire clone. The amazing, in more ways than one, Eric Barbour, has very kindly let Cat Girl Synthesizers put up the schematics of a few of his TS era designs. I have done most of the PCB and have one of the transformers but there is still a fair way to go...

Sunday, August 8, 2010


This is the Temco attached to the X-4046 VCO...
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Friday, August 6, 2010


I have never really got into getting the 1V/Octave tuning exact before and so I have decided to get a bit more serious about it all! This is the first experimental cut with the MIDI board (on the left) driving the X-4046 VCO (on the right). I then have a Ruby script that steps the MIDI interface and then queries the Digital Frequency Counter for the current frequency. I then do some maths and work out the slope for what would be a 1V/Oct and tweek to suit. A sweep takes about 3 or 4 minutes so the turn around is pretty good. I have also done an overnight run without a Tempco and plan to do another with to see the difference!
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