Recent Posts

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21
PreenFM2 / Re: Issue with Encoder
« Last post by kylelandstra on February 17, 2017, 05:52:50 PM »
Attached is what it looks like.  I guess it could use a Isopropyl scrub but all of the connections look clean to me on both sides of the PCB.  Their orientation is correct as well.
22
PreenFM2 / Re: Issue with Encoder
« Last post by Xavier on February 17, 2017, 01:48:08 PM »
Hi, 
Sorry i have a super limited internet access until next sunday.
Double check the soldering points of the 2 '9 pins network resistors'  just above the encoders.
23
PreenFM2 / Re: preenFM is going to Eurorack
« Last post by klangFM on February 17, 2017, 12:23:22 PM »
Attached are two possible desings for scaling an anlog input singal to 3,3V with diode protection.
For a 12 bit convertion it should work. It is easy to implement in existing pcb.

24
PreenFM2 / [Resolved] Issue with Encoder
« Last post by kylelandstra 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.
25
PreenFM2 / Re: preenFM is going to Eurorack
« Last post by lokki on February 15, 2017, 09:57:12 PM »
xavier i get this when i try to compile the adc branch:

build/PreenFM_irq.o: In function `TIM2_IRQHandler':
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_irq.c:236: undefined reference to `TIM_ClearITPendingBit'
build/PreenFM_init.o: In function `ADC_Config()':
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:137: undefined reference to `TIM_TimeBaseStructInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:144: undefined reference to `TIM_TimeBaseInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:145: undefined reference to `TIM_SelectOutputTrigger'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:146: undefined reference to `TIM_ITConfig'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:167: undefined reference to `DMA_StructInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:186: undefined reference to `DMA_Init'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:187: undefined reference to `DMA_Cmd'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:190: undefined reference to `ADC_StructInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:191: undefined reference to `ADC_CommonStructInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:194: undefined reference to `ADC_Cmd'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:195: undefined reference to `ADC_DeInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:205: undefined reference to `ADC_CommonInit'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:215: undefined reference to `ADC_Init'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:219: undefined reference to `ADC_RegularChannelConfig'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:220: undefined reference to `ADC_RegularChannelConfig'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:221: undefined reference to `ADC_RegularChannelConfig'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:222: undefined reference to `ADC_RegularChannelConfig'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:225: undefined reference to `ADC_DMARequestAfterLastTransferCmd'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:228: undefined reference to `ADC_DMACmd'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:231: undefined reference to `ADC_Cmd'
/home/lokki/Downloads/preenfm2-adcIn/src/PreenFM_init.c:234: undefined reference to `TIM_Cmd'
collect2: error: ld returned 1 exit status
Makefile:247: recipe for target 'build/p2_2.06o.elf' failed
26
PreenFM2 / Re: preenFM is going to Eurorack
« Last post by lokki on February 15, 2017, 09:46:29 PM »
i can compile the firmware for you if no one else does :-)
27
PreenFM2 / Re: preenFM is going to Eurorack
« Last post by klangFM on February 15, 2017, 05:39:04 PM »
Thanks,
who can compile me this github stuff: acdcIN?
I'am analog.
Question: AD controll range is 0-3.3V. For a scaling opamp one use an inverting desing and output is 3,3V to V.
Therefore it is better to invert input range in acdcIn firmware.
Possible?
As far I get a compiled version I test it and draw a little schematic with board.

willi

28
PreenFM2 / Re: PC/Mac Editor version 2.00
« Last post by kylelandstra on February 15, 2017, 06:46:31 AM »
I have been using the editor in standalone as I've had issues with one of my encoders (waiting for some in the mail to see if the issue with the part itself) and wanted to program patches in the interim.  I was wondering, is it possible for the editor to read user created waveforms?
29
PreenFM2 / Re: How to create txt user waveform
« Last post by Silent_Horror on February 14, 2017, 10:07:16 AM »
Many thanks Xavier for the new updates .. Loving it
As for waveforms, I haven't tried audacity, but hope can find some waveforms similar to Shruthi 1 to upload
30
PreenFM2 / Re: Metal case wanted
« Last post by mmontag on February 13, 2017, 11:16:36 PM »
VanDaal has some metal cases in stock now. Mark as completed :)
http://vandaal-electronics.com/product/preenfm-metal-case/
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