Abstrakt Instruments VS-1 DIY

120K - MPE Support
140K - Direct Outputs
160K - Stereo Analog Chorus - We have a hell of an analog chorus designed - we can't add cost & commit resources to implement it unless we reach certain cost targets.
180K SD Card
all Stretch Goals arrived

Disclaimer

This guide is a best practice guide and I'm not responsible for any damage, or product quality.

Please respect your local laws/regulation for handling of electronics/electricity.

I'm not responsible for damages, failures with your build.

Do not try to build this device without basic knowledge of synthesizers. You need experience in DIY.

BOM: (officially by Abstrakt Instruments)

VS-1_DIY_BOM(v102).xlsx from 04.Jan.2024

VS-1_DIY_BOM(v103).xlsx from 24.Jan.2024

VS-1_DIY_BOM(v104).xlsx from 09.Feb.2024 please look at t he changeling in the BOM, in case you used the BOM 1.03 previous.

Soldercore

you need 2 solder core types:

water soluble solder core, this is the solder core which you use for resistors,capacistors, IC-sockets, parts which can be in touch in water.

https://www.digikey.de/de/products/detail/kester-solder/24-6337-6403/6048

part nr. 24-6337-6403

2. no clean solder core - which must be used for trimmers and potentiometer (everything which has to be installed after you washed the pcbs with hot water)

https://www.digikey.de/de/products/detail/kester-solder/24-6337-8809/365521?s=N4IgTCBcDa4CwFoBsBmFB2BAOLAGAnCALoC%2BQA

part nr. 24-6337-8809

Schematics: (copy from 09.Feb.2024)

vs1_schematics.pdf

Build it:

Please see the Altium 365 Viewer documentation for full details on the cloud-based tool.

Altium links: (open the links inside of the page every day - do not use a old browser session, the browser do not update the content automatically)

https://abstraktinstruments.com/vs1-diy/

PCB Scans: (Copyright Patrick)

Build Manual: (officially by Abstrakt Instruments)

Please Note: The VS-1 Build Manual is still in draft form, currently draft v0.83. Formatting may change, and Section 3 on calibration is yet to be completed. There are also a few steps left in section 2 to be completed.

vs1_build_manual_v0.83.pdf

furthermore watch all YT videos on Brians Channel:

https://www.youtube.com/@abstraktinstruments8666

Issues/Failures/Improvements

You have to respect the Build Manual from Brian too. in case of question, contact me by Email or Facebook, Modwiggler, instagram.

ID	Date	Bug/Issue/Improvement	affected part/pcb	Issue	Fix	reported by	reported to developer	Status/Validation QM Process	affected version	Info for the Developer only

ID	Date	Bug/Issue/Improvement	affected part/pcb	Issue	Fix	reported by	reported to developer	Status/Validation QM Process	affected version	Info for the Developer only
1	Jan 2024	Silkscreen wrong	Voice Motherboard	diode wrong silksvcreen orientation D13 The Silkscreen is correct on the PCB	install against silkscreen	modwiggler user	no		diy	this was a wrong issue !!
2	25.Jan 2024	info	PSU	check that your PSU is still modified with other regulators my psu was still modified with the correct parts since it was bought as Partkit from Brian, back in 2020.	perform a visible check and keep in mind to test the psu later without attached Device/pcbs, as described in the YT Videos/guide.	Patrick	no		diy
3	25.Jan 2024	build info	Voice and Voice Motherboard	you have to respect that the MOLEX connectors on the Voice Motherboard and Voices have to installed in one step. You cannot start with soldering the molex connectors at the pcb without align it against the opposite part. do this:	It's highly recommended to use a ruler or other exact flat precisely tool to allign the Molex Pin headers in a row. This makes things easier.	Patrick	no	valid - tested by Patrick
4	27.Jan.2024	BOM failure	Voicecard	Voice Cards BOM lists 1.5M resistor for R7 and R45, but those are already filled with 49.9K resistors as per the BOM and the schematic	wait on validation, DO NOT INSTALL R7/R45 do not populate R7 and R45	Stuck and Patrick		not validated now	BOM 1.0.3
5	27.Jan.2024	Bom failure ?	Output board	On the Output board - R22 isn’t listed on the BOM, schematic says 2.2K	wait on validation	Facebook Sduck		notvalidated now	BOM 1.0.3
6	27.Jan.2024	Info	Output board	C22 is DNP - do not populate	C22 is DNP - do not populate	Facebook Sduck		notvalidated now	BOM 1.0.3	--
7	27.Jan.2024	BOM failure	Output Board	Q15, 16, 17, 18 aren’t listed on the BOM	is 2SC2878	Facebook Sduck		not validated	BOM 1.0.3	change the BOM
8	28.jan 2024	info	Voicecard	"Note that R140 and R141 are the preinstalled smt resistors on the back."		Facebook Sduck		valid	BOM 1.0.3	change the BOM
9	28.jan 2024	info	Voicecard	"Brian for some reason doesn't list parts that are back in the "Rare Parts" list, so A3 is an CA3086N; A10, A12, A13, A14, A15 are all AS3080E; and A18 and A19 are AS3310."		Facebook Sduck			BOM 1.0.3	change the BOM
10	28.jan 2024	info	Voicecard	"There is one wrong sized hole on the bottom row of holes for the molex connectors. In one of the videos Brian suggests using a dremel tool to grind down the size of the affected pin, which I tried and it was relatively easy and worked well. I suppose you could also drill out the hole, but you would then also drill out the solder pad, and would need to run a wire jumper from the affected pin to one of the vias to make that work."		Facebook Sduck		valid	BOM 1.0.3	Brian change on Voicecard
11	29.Jan.2024	info	Voice MOBO	30k resistor bag is labeled with quantity of 32 - in Altium is 24.	24 are required - BOM 1.03 correct, just the bag is wrong	Patrick		valid
12	29. Jan.2024	info	Voice MOBO	100nF caps 20 in bag and labeled with quant. of 20, BOM is quant. of 18 and in Altium	18 required - Bag is wrong	Patrick
13	29.Jan.2024	Important Info	Voice Mobo	don´t remove the pcb stripes (from pcb fab - panelized pcb) in case you use a solder frame. otherwise the traces can be damaged		Patrick		valid
14	29. Jan 2024	improvement	Voice Mobo	use 1/4W 0.5W watt 0207 Format resistors for R66/R67 to improve thermal noise	use 1/4W 0.5W watt 0207 Format resistors for R66/R67 to improve thermal noise	Patrick
15	5.feb 2024	bug	Voice Mobo	U2 wrong silkscreen orientation	install in this way	Patrick		valid	batch 01/2024 from kickstarter	Brian - change the Silkscreen
16	07.feb 2024	Important Info	Output Board	Install R7, R11, R37, R41, R48 & R73 with few millimeter distance against the PCB to avoid Thermal Issues	Install R7, R11, R37, R41, R48 & R73 with few millimeter distance against the PCB to avoid Thermal Issues. Look in. the Buildguide	Brian		valid Yutube video and build guide	all Versions
17	07.Feb.2024	Important Info	Voice	Since we have to trim the Voices by Trimmers from Top, its not possible for 2 Trimmers when you have installed IC Sockets for A3 (Expo CA3086/CA3046)	Do not install a IC Socket in A3 in case you still installed a IC Socket, desolder 2 pins of T3 and pull the trimmer out as shown	Patrick		valid	all Versions
17	07.Feb.2024	Important Info	Voice	Since we have to trim the Voices by Trimmers from Top, its not possible for 2 Trimmers when you have installed IC Sockets for A10	Do not install a IC Socket in A10 in case you still installed a IC Socket, desolder 2 pins of T9 and pull the trimmer out as shown	Patrick		valid	all Versions	--
18	07.Feb.2024	Tip	all PCBs	do not clean the Styrene Cap with Isopropyl - the Capacitor is glued and can be damaged		Patrick		valid
19	07.Feb.2024	Tip	all PCBs	Do not wash the Trimmers, install the Trimmers and styrene Cap on Voice Card at the end and		Patrick		valid
20	07.Feb.2024	Tip	Voicecard	for better Installation and to avoid a broken capacitor due to mechanical stress bend the pins for C19 and C12	on left original, on right bend style	Patrick		valid		@Brian change the Voicecard Pinout for C19/C12
21	10.Feb.2024	BUG	Controlpanel PCB