Recent Posts

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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by Xavier on March 09, 2017, 02:29:53 PM »
 Nice to see the 4 cv in  :)
Thanks for sharing....
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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by klangFM on March 07, 2017, 12:48:44 PM »
preefm2 with CV inputs:
At the moment only 2CV in are active. PCB only a prototyp. Later a little pcb will be finished to fit direct on P3, input of ADC.
Input protection works fine:
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PreenFM2 / Re: Issue with Encoder
« Last post by Xavier on February 22, 2017, 08:49:42 AM »
Cool  :D
Thanks for the update.
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PreenFM2 / Re: Issue with Encoder
« Last post by kylelandstra on February 22, 2017, 06:26:58 AM »
Thanks for the schema Xavier, it really helped pinpoint the issue!  It was definitely a point on one of those signal paths that I forgot to solder....haha ugh.....

Finally up and running great!  Also perfected creating a waveform out of my voice (trying to tap into the formant wavetable vibe).  Excited to access the power of this synth, thanks so much again Xavier!
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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by Xavier on February 21, 2017, 09:05:02 AM »
I keep you informed.

Thanks  :D
Looking forward to see how it goes... and your modified front panel.
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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by klangFM on February 20, 2017, 10:35:44 PM »
Yes,
but at the moment it is great to have the option of CV in.
Let us explore the possibilities and be happy.
I modify my frontpanel for 4 CVin and make a little pcb for 4CV protection/scalers next days.
The pcb fits on JP3 and needs only few cables.
I keep you informed.

willi
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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by Xavier on February 20, 2017, 09:07:59 PM »
Is it possible to play notes via CV1-FQ and CV2-Gate (routed in matrix)?

No. I know this would be great.
Don't know when i'll find time to do that.

Xavier
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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by klangFM on February 20, 2017, 02:59:01 PM »
Thanks Xavier,
software adcIN  installed and works.
A quick test with hardware scaler on and it works also.
Now test it and play around.
Is it possible to play notes via CV1-FQ and CV2-Gate (routed in matrix)?
At the moment I started to play a note manually or with Midi or running Appegiator.
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PreenFM2 / Re: preenFM is going to Eurorack
« Last post by Xavier on February 19, 2017, 09:35:12 PM »
Thanks Lokki for the feedback and klangFM for the schema.
I forgot to push to github the correct Makefile.
It now compiles fine.

I attached the firmware of this adcIn branch.
USE IT AT YOUR OWN RISK !!!  :)

For technical info,  a timer interuption and some DMA mechanism sample automatically the 4 analog pins.
It is done 4 times per block for each analog pins.
The final value is the average of those 4 samples to get rid of sample noise.
The final sampling rate is one value per 32 samples so arround 1200Hz. External oscillator as fast as 500Hz should work, wich leads to modulation much faster than the internal lfo.

I only tested with variable resistor pot plugged between 0v and 3.3v as analog source.
So let me know if some of you succed in using real analog hardware.

Xavier
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PreenFM2 / Re: Issue with Encoder
« Last post by Xavier on February 19, 2017, 09:00:24 PM »
Hi,

I attached a schema of the tracks you should follow for this encoder.
Double check and resolder (re-melt) those 6 points (green and orange) + GND point of the encoder (middle pin of the 3).

If it still does not work :
- check those connections from the solder point to the 74HC165 pins.
- try to swap the 2 74HC165 to verify one is not faulty.

Let me know,

Xavier
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