Tuesday, 29 October 2013

Slow news.....

They say no news is good news, right?  Well, progress at CESYG has been fast and slow.  First and foremost, the SuMIX project has been shelved - but the idea lives on and may resurface one day. On a more positive note, the BUS5 and BUS5X are now available to provide a 5-channel routing system within and between modular synth cases.  Finally, design work is progressing well on the next CESYG module.  Nothing more to say on it yet until I get a prototype working on the bench, and then I'll post piccies to tempt you!


Tuesday, 13 November 2012

SuMIX Headphone Amplifier

Tonight I've built the headphone amp, and tweaked the design to achieve lower distortion (noise is now the  dominant factor).  30R headphones you're looking at around 0.01% distortion at 1kHz when pushing 120mW into the headphone (unlikely!). For 600R headphones you can go even louder with even lower THD, and then I'm starting to reach the limits of my HP distortion analyser (below about 0.005%).


Thursday, 23 August 2012

First panel mock up of SuMIX

As hinted at earlier, the next module I'm working on is an output summing mixer for the Eurorack format.  And here is the first view of the front panel.
Ignore the blobs on the corners, those are just for aligning the artwork with the panel mechanics.
Also this shows representations of the panel furniture (knobs, leds, jacks, switches) to give a better impression of how it might look.
And thanks to Cody for his useful input :)

Wednesday, 8 August 2012

DuaLFO Goes Even Slower!

After some discussion on muffwiggler I ran a test to see how slow the DuaLFO could really go with a negative CV input.  Internally it is limited to -0.6V, so I applied -3V just to make sure.

Using my Heath-Robinson-style low frequency counter I measured the period to be about 8,833 seconds, or about 2 hours 27 minutes.  Now that's slow!!!

Thursday, 28 June 2012

On to the next one

Now that the DuaLFO is finished and shipping it's time to start work on the next module.  This time it's going to be an audio mixer.  And I think it's going to be very interesting.

Wednesday, 30 May 2012

Thursday, 10 May 2012

Auxiliary LFO Equally Slow

Last night I ran the same tests on the Auxiliary LFO.  It has the same maximum frequency of 46Hz, but if anything it is slightly slower than the Main LFO.  I recorded a run of 1 hour 35 minutes.

I think that's slow enough....