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preenfm2 and preenfm3 / [Resolved] Issue with Encoder

« on: February 17, 2017, 03:22:23 AM »

I am having issues with the third encoder highlighted in red in my attachment.  It's constantly jumpy.  If I move it to increase a value, sometimes it counts up in random increments and sometimes it decreases in value (even though I am turning the knob clockwise).  Then if I use it to turn counterclockwise or to decrease a value, it still goes down but when I stop twisting the knob it it shoots right up to the maximum value without me touching the knob.  All of my other encoders work fine and there are no issues with them. 

I initially thought it was an issue with the specific encoder, so I ordered a new one from mouser.  These ones do not have the two feet on the backside (highlighted in green), yet they are still acting the same way.  I cleaned my entire board with isopropyl alcohol and ensured solid connections with both this encoder and the initial one.  What is wrong???  Very anxious to get this synth up and running yet keep running into issues.  Please help me.

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preenfm2 and preenfm3 / [Resolved] PreenFM2 will not turn on

« on: February 09, 2017, 01:53:49 AM »

Attached is a photo of my board.  Before I put my board in the case, I wanted to make sure everything worked first.  I then found out that it is currently not turning on through USB or wall wart.  When plugging in via USB I did not see the preenfm USB stick show up as a device which I think would nullify the issue of my screen not working.  Is anything missing that is glaringly obvious? 

The USB stick has the correct designated filepath.  All connections seem strong.  I went through the build steps again and the only thing I can think of is that the P1 and P3 must be connected.  The 330nF decoupling capacitor and the 1nF plastic capacitors all look different than in the build pictures as I got the kit from Van Daal. The 330nF has 334 printed on the side and I assumed that was ok. The Jmp3 is not connected.  Also the 5V GND and and USB square (near the 7805) are not connected.  From the FAQ it said P3 was optional and I assumed that since I had no intention of using the st-link v2 debugger, P1 would be optional as well and instructions didn't mention the 5V GND or the USB headers.  Am I wrong?  Should the preenF405/CERB40 chip have no exposed metal and completely inserted into its holder?  I can't seem to push it in completely.  Also no LED lights were connected since I am using the metal case and won't be able to see them.  So I am not sure if any of these items are required for me to be able to power the device on.  Help would be much appreciated, excited to get this synth rolling!

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preenfm2 and preenfm3 / Build Question - 20 pin header connections (only given 8 in my Van Daal kit)

« on: January 26, 2017, 03:11:06 AM »

Hi all,

I'm relatively new to DIY electronics so please forgive me.  My question is in regards to the "Regular for Jmp1-3 and the rest" below.  As a note, I had purchased mine from Van Daal.




I was only given 8 of those pins out of the 20 shown on the right hand side of the photo.  So far I have soldered 2 on for the Jmp1 and 2 for the Jmp2.  From the directions it states Jmp3 is not required, but only for the DFU.  So would I need to solder/unsolder the Jmp3 every time I need to update the firmware?  Or just for the first time I turn it on?  Or not required at all?


Secondly, in the photo below, it shows various pin headers (two 5 pin headers, one 2 pin header) connected yet in the directions it states that these are "optional".  Is that true that these shown below are not required?





Since I was only given an 8 pin stick for headers, you may see my dilemma.  Luckily if only the Jmp1 and Jmp2 are required, I would have just enough pins left for the In/Out (pictured below).





Once again, I appreciate the help.  Please forgive me if these are newbie questions, but with this being my first synth I've built and seemingly not given enough header pins to work with, I want to make sure I do it right. 

Thanks,
Kyle