Messages

16

preenfm2 and preenfm3 / Re: Finished build, no boot

« on: May 20, 2020, 07:30:25 PM »

Thanks for your help Xavier. I found the problem. The problem is that I'm a moron. LD33CV was mounted the wrong way around... 

The screen is blue and it does look strange. Pixel horizontal lines change intensity individually, relatively fast, giving a shimmering effect. If there's few information on the screen, the shimmering stops, but lines still have various intensities. Weird. Being clueless, I tried to short the 22 Ohm resistor to see if it stopped this behavior, but it doesn't change anything.

EDIT: as per instructions, I have left one of the 68 Ohm resistors unpopulated (the one next to the 10μH inductor). Should I put something here?

17

preenfm2 and preenfm3 / Re: Finished build, no boot

« on: May 20, 2020, 03:33:36 PM »

Thanks Xavier. I am out right now so I'll make the checks tonight. Just a few more questions before that:

.  Yellow oled screen do need this 22 Ohm resistor, specially if you add an aluminium shield.

This still means I should short these two contacts with a wire or zero Ohm resistor, right?

. the 10k variable resistor is used by LCD screen to adjust the contrast. It's useless on OLED.

Okay. It doesn't matter if I leave the variable resistor there, does it?

And finally: I know which leg is the anode on LEDs, but suppose I soldered them the wrong way, could it be that much of a show stopper?

18

preenfm2 and preenfm3 / Finished build, no boot [Solved]

« on: May 20, 2020, 01:36:20 PM »

Hi Everyone,

just finished my PreenFM2 build (kit bought from VanDaal) and it doesn't boot. I power it from USB. I populated jumpers 1 and 2. USB stick has all files on it.

I did things I'm not sure I should have done:

• put the OLED 22 Ohm resistor (I still don't understand the difference between "OLED" and "OLED Mod"...)
• put a 10K variable resistor in the reserved slot just because I thought it would be cool to be able to dim the screen

Symptoms:

• Preen doesn't register in Win10x64 when connected
• USB stick LED lights up continuous
• LD33CV reg warms up
• LM7805 reg stays cool
• screen remains pitch black
• PCB LEDs won't blink whatever knob I twiddle or switch I push

Any help appreciated!

19

preenfm2 and preenfm3 / Re: Voices / Operators

« on: April 27, 2020, 08:52:36 AM »

All clear, merci beaucoup. 

20

preenfm2 and preenfm3 / Re: Voices / Operators

« on: April 26, 2020, 11:07:39 PM »

Hi,

thanks for your reply. I had read the diagram already.

On the other hand, I haven't paid close enough attention to the Algorithms and hadn't noticed there were no 5-Op arrangements.

But even so: if there was such a thing as a 5-Op Algorithm, would my interpretation of how Voices are dealt with be correct?

21

preenfm2 and preenfm3 / Re: Voices / Operators

« on: April 25, 2020, 05:02:07 PM »

Okay thanks.

Digging further: if I change one of my two Instruments to a 4-Operator algorithm, I should gain an additional Voice. Right?

5.Op x 5.Note = 25.Op | 4.Op x 5.Note = 20.Op | 25.Op + 20.Op = 45.Op

22

preenfm2 and preenfm3 / Voices / Operators

« on: April 24, 2020, 11:18:37 PM »

Hi,

ordered my kit and looking forward to assembly.

Question: let's say I have a 2-Instrument "patch", and each of the two Instruments uses 5-Operator algorithms. Every time I hit a note, I sound 10 Operators (2 Instruments x 5 Operators). So if I hit four notes simultaneously, I sound 40 Operators (4 Voices x 2 Instruments x 5 Operators) out of the 48 available, which means I have a max. polyphony of 4.

Is this correct?