PORTABELLABZ



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The CV/gate Card for EMS Synthi A / VCS3

The card adds CV/gate facilities to any Synthi to control it with standard 1V/oct keyboards, sequencers, midi to CV/gate converters...
It simply plugs directly into the 8 pins Jones "keyboard" socket and is powered by the Synthi, without cable or connector.
For use with a VCS3, a second Jones plug can be mounted to the PCB's one to extend it, so it plugs easily into the VCS3's rear Jones socket.



Features

gate input
- accepts signals from +4.5V to +15V
- the incoming signals can mix with the Synthi's looping envelope
- 3 position toggle switch :
    top - sustained : the on time depends on the gate signal length, ie how long the key is depressed
    center - off : no gate signal is sent to the Synthi
    bottom - transient : the gate signal is converted into a short trigger and the on time depends on the on pot setting only

cv1 input
- tracks over about 5 octaves
- CV available on row 8
- 2 position mini slide switch :
    left - CAL : pre-scaled 1V/oct input with input ch level 1 pot set fully CW to 10
    right : standard CV input with 100k series resistor for manual scaling with the input ch level 1 pot

cv2 input
- tracks over about 5 octaves
- CV available on row 9
- 2 position mini slide switch :
    left - CAL : pre-scaled 1V/oct input with input ch level 2 pot set fully CW to 10
    right : standard CV input with 100k series resistor for manual scaling with the input ch level 2 pot

cv3 input
- tracks over about 5 octaves
- CV available on row 16 if your Synthi is a MK2 with a joystick vertical range switched pot (or a modified MK1)
- pre-scaled 1V/oct input only
- 2 position toggle switch :
    top : normal CV
    bottom - inv : inverted CV


The DIY PCB + panel set costs 35 shipped untracked.
It includes PCB, panel, Jones connector cover, buffer PCB for matrix rows 8 and 9 (I do not supply with other parts).

Users manual

BOM and build notes

http://www.portabellabz.be/images/sister/IMG_1268.JPG


A pre-built CV/gate Card costs 140 + shipping.
Contact me to order one.




http://www.portabellabz.be/images/sister/IMG_1271.JPG
http://www.portabellabz.be/images/sister/IMG_1272.JPG