Recent Posts

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21
PreenFM2 / Re: Just started soldering.. am i doing it right? (n00b warning!)
« Last post by Xavier on February 03, 2018, 08:55:07 AM »

You should ask Van Daal Electronics as i don't know exactly the reference.
But i assume that's good :)

This is the audio filter part, so you cannot break anything if that's wrong.
22
PreenFM2 / Build questions continued
« Last post by mbng on February 03, 2018, 08:46:50 AM »
Hey all,
i have another question - as you can se by the attached images i have arrived at the point where the text states:

"Now let’s solder the 4 plastic capacitors. With the resistors around and the operational amplifer, they make a low pass filter (20Khz) whose goal is to antialias the output of the DAC."

In the original image all the four capacitors are white-ish and the upper & lowermost ones have the text "1nJ100", but as you can see mine are red and have the text "WIMA  1000 100-" i think (a little bit blurred).

They were the only ones that made sense to fit in place. Are they alright or should i try to find something else? They were included in the full kit i got from VanDaal.

Thanks in advance. :)
//M

23
PreenFM2 / Re: LCD display connector
« Last post by zelea2 on February 02, 2018, 09:03:57 PM »
Have a look at the bom and at the LCD case in the github folder :
https://github.com/Ixox/preenfm2/tree/master/hardware/case

It's still not very clear but I can see your spacers are 8mm while my screen sits now at 10mm.
Switching the socket to Augat type will probably give me that smaller gap.

This also means that my buttons caps are too low (probaby need to glue another one on top) AND the encoder knobs are too tall - need  to get the ones from your BOM or use my router to remove some plastic from the current ones.

For the cases I think I'll use the green 6600 acrylic because it's a dark green and still has about 27% transparency.
24
PreenFM2 / Re: priority bits
« Last post by zelea2 on February 02, 2018, 08:49:23 PM »
Setting the sub-priority in the above context can be considered a (harmless) bug. It's at least confusing when you read the code so I think it's worth placing a zero or remove the lines initializing the sub-priority.
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PreenFM2 / Re: priority bits
« Last post by Xavier on February 02, 2018, 08:21:53 AM »

In the current design, the only important priority is the interuption that feeds the DAC from what i remember.
26
PreenFM2 / Re: LCD display connector
« Last post by Xavier on February 02, 2018, 08:19:55 AM »
Have a look at the bom and at the LCD case in the github folder :
https://github.com/Ixox/preenfm2/tree/master/hardware/case

They all work fine together.
27
PreenFM2 / LCD display connector
« Last post by zelea2 on February 02, 2018, 04:10:54 AM »
I was looking into building some cases for my PreenFM2s and I don't know how to solve the problem of the LCD display height. Now I have a normal ".1 header male and female and that's quite high. Even if I replace it with the Augat type (see picture) I'll only be able to lower it about 1mm and it needs to be flush with the buttons and that's 8-9mm lower. The only option I see is to solder the LCD header permanently to the main board.

I could raise the buttons (by using a different cap or by gluing 2 caps above each other but I can't raise them too much because they are limited by the encoder knobs.

How did you solved this problem. Are your LCDs much thinner than mine?
28
PreenFM2 / priority bits
« Last post by zelea2 on February 01, 2018, 01:39:26 AM »
In the git code I've noticed that __NVIC_PRIO_BITS is not defined so it stays at its default value of 4
This means 4 bits for the PreemptionPriority and none for the SubPriority

Then in various places in the code both ChannelPreemptionPriority and ChannelSubPriority are
initialized with non zero values. Obviously the ChannelSubPriority has no effect and stays at zero.

One only needs sub-priority when several interrupts with the same preemption are pending then the
sub-priority decides which one is served first.
29
PreenFM2 / Re: Just started soldering.. am i doing it right? (n00b warning!)
« Last post by mbng on January 31, 2018, 09:22:41 AM »
Hey Xavier, i´ll be careful and won´t rush the process. I´ll try to finish the build today - really looking forward to it!
Thanks for your reply.  :)
30
PreenFM2 / Re: PreenFM2 encoders
« Last post by matrix12x on January 31, 2018, 01:07:11 AM »
Cool. Hope it helped.
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