376
preenfm2 and preenfm3 / Re: Modulation Matrix
« on: July 12, 2016, 12:09:08 AM »thats what FM is...
well technically that's what AM is...
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well technically that's what AM is...
377
preenfm2 and preenfm3 / Re: preenFM is going to Eurorack
« on: July 09, 2016, 11:30:32 AM »
xavier, how high would the samplerate of the adc with your firmware approximately be? could we also theoretically input audio-rate signals?
cheers
cheers
378
preenfm2 and preenfm3 / Re: preenFM is going to Eurorack
« on: July 09, 2016, 10:45:45 AM »
yep. so i will try to come up with something and post the schematic. i will use it with 0-5v signals, but the general principle will be the same.
379
preenfm2 and preenfm3 / Re: preenFM is going to Eurorack
« on: July 09, 2016, 12:30:25 AM »
yep, maybe. so basically we just need to scale the 0-10v control voltage to 0-3.3v and you open the ports and add support for the analog input in the matrix?
this would be super awesome! scaling the cv should not be hard.
this would be super awesome! scaling the cv should not be hard.
380
preenfm2 and preenfm3 / Re: Yellow OLED : high frequency solution
« on: July 08, 2016, 11:31:30 PM »
ok, thanks for the clarification. strange, it does not look darker at all! surely perfectly useable for my purposes.
the aluminium shield / resistor mod combo works wonders, thanks for this simple fix! i put 128 layers of aluminium between the display and the pcb and i cannot see (or hear) any spike in voxengo span. this is with the internal input (gain maxed out) on a macbook pro. with 64 layers i could still see a small spike.
the aluminium shield / resistor mod combo works wonders, thanks for this simple fix! i put 128 layers of aluminium between the display and the pcb and i cannot see (or hear) any spike in voxengo span. this is with the internal input (gain maxed out) on a macbook pro. with 64 layers i could still see a small spike.
381
preenfm2 and preenfm3 / Re: Hello, new to the board :) / High frequency parasite?
« on: July 08, 2016, 10:03:03 PM »
I did find one solution that works 100%: plug the PreenFM through a passive D.I. with GND Lift. Like this I have a regular background noise, there might be this frequency a bit stronger (when you know it), but it's more than reasonably quiet!
this makes sense, but it essentially cuts all frequencies above/around 15 kHz and higher since passive d.i. tend to roll off highs anyways. (the audio goes through a transformer, hence you can insulate it completely)
382
preenfm2 and preenfm3 / Re: Yellow OLED : high frequency solution
« on: July 08, 2016, 04:52:36 PM »
hi xavier,
i put a 68ohm instead of 22ohm in there, is it also ok? everything seems to work, so i thought i ask why exactly you choose the 22ohm value? (brightness maybe?)
also note that this "mod" cures my problem with power feeding from the macbook air (if you remember). so it seems the display was the current hungry thing that made the macbook air struggle.
cheers
i put a 68ohm instead of 22ohm in there, is it also ok? everything seems to work, so i thought i ask why exactly you choose the 22ohm value? (brightness maybe?)
also note that this "mod" cures my problem with power feeding from the macbook air (if you remember). so it seems the display was the current hungry thing that made the macbook air struggle.
cheers
383
preenfm2 and preenfm3 / Re: cerb40 flashing
« on: August 04, 2015, 03:01:48 PM »
just to bring this up since i had the same problem...
it does not have to be bad soldering. if you have hooked up the preenfm2 to a usb port for power, try a different computer.
when i had hooked up my preenfm2 to a macbook air, i got flaky display issues (writing from right to left, only row one and three, nothing, scrolling text all over the display...) i soldered headers again and checked continuity with the multimeter. the issue stayed. at one point i switched the usb connector to my macbook pro, and voila! it worked perfectly! seems the macbook air had not enough "current" for the preenfm2....
it does not have to be bad soldering. if you have hooked up the preenfm2 to a usb port for power, try a different computer.
when i had hooked up my preenfm2 to a macbook air, i got flaky display issues (writing from right to left, only row one and three, nothing, scrolling text all over the display...) i soldered headers again and checked continuity with the multimeter. the issue stayed. at one point i switched the usb connector to my macbook pro, and voila! it worked perfectly! seems the macbook air had not enough "current" for the preenfm2....