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VCS3 Card for 208 and Easel build thread
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author VCS3 Card for 208 and Easel build thread
papz
The PCBs are available on http://www.portabellabz.be/vcs3.html

BOM : http://www.portabellabz.be/images/vcs3/VCS3_Card_tr_BOM.xlsx
Build notes : http://www.portabellabz.be/images/vcs3/VCS3_Card_build_notes.pdf - Please use the latest revision, the date is on page 3.
Users manual : http://www.portabellabz.be/images/vcs3/VCS3_Card.pdf

jonny_w
Awesome! Any plans on offering a black version to match my Toolbox, BOB, and Easel set? Blue is fine of course, but I had to ask Mr. Green
papz
Thanks
No plan on a black version, sorry.
pathein
have just ordered the pcb and looking around for the non tayda parts,

for the metal can NPN supermatched pair(2N2916 or MAT02 or LM394 or KC811)

most are hard to get from where i am and worried bout fake old parts of sort. Then i saw cabintech has the as194H/394H (194H)

Hi papz, was wondering for this part, will it be critical together with the 1k tempco, as in using the 194H instead of 394H.
papz
Thanks for your order, I posted it today.

I haven't tested this 194H but it should work, in fact any metal can NPN supermatched pair should be ok, or even 2 matched NPN transistors glued together, as it was in the early Synthi A and VCS3 (but this may reduce tracking accuracy and stability).

I just tested cheap MAT02EH purchased on ebay (seller adeleparts2010), probably are fakes because the labeling is different and their hFE is much lower than real ones that I have (the Chinese one is 171, the real one 662) but the pinout is ok, the pair is properly matched and I could get a perfect tracking over 5 octaves.
heapish
Jaw on the floor we're not worthy
pathein
Thanks Papz, for the pcb and info on the transistors!
papz
You're welcome, happy building !

I just modified the card edge connector of Jerome's 208r rev1 to fit in the VCS3 Card and it works perfect.
I'll post the modification details on my website soon.
papz
I updated the build notes with
208r rev1 program card slot modification
CO dedicated output modification (the CO is a great master for the VCS3 Card oscillator sync input)
papz
I updated the build notes with some helpful info.
Happy building.
papz
Still no questions despite 15 DIY PCB sets were sold ?
Hopefully this means no builder had problems. thumbs up

In a batch of KC811 with code A50 and A40, many cause small jumps in the oscillator pitch, mostly noticeable in high frequencies, and others are ok.
These supermatched pairs are cheap and good working when ok but need selection on test, it may be better to buy another type if you plan to buy only one.

I ordered some AS394 from https://www.ericasynths.lv/shop/diy/diy-accessories/as394-matched-tran sistors/ and will test in a few days.
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