Every SYNTHI needs a Sister Card

Discussing some incredible modules that don't quite fit into the other forum categories.

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papz
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Every SYNTHI needs a Sister Card

Post by papz » Wed Mar 25, 2020 7:57 am

Hi

I'm happy to introduce this new Portabellabz expansion card for the Synthi A and AKS, mostly intended for the experimental Synthi playing but not only, it's able to create crazy droid sounds as well as subtle modulations (another card more intended for equal temperament will be announced soon, stay tuned ;) ).

The card simply plugs directly into the 8 pins Jones "keyboard" socket and is powered by the Synthi, no cables no connector, it's plug and play, easy and hassle free.
For use with a VCS3, the Jones plug can be mounted onto the top side of the PCB but an adapted umbilical cable with swapped connections is requested, the standard cable won't work.

Warning : the card's power consumption is close to 50mA on each -9V/+12V power rail, which is the maximum a MK1 PSU can handle according to the VCS3 MK1 users manual.
It *should* work with factory condition MK1 units but will push this old PSU to the limits. I assume no liability in case of problem (anyway, it can be repaired, no worries).
In several MKI units (including my own one) I added an extra PSU to power a KS and I'm happy to share the how to if needed.


Image

Image

Image


Features :

Thick PCB for best stability and solidity

2 identical LFOs
Bipolar signal
Square output
Triangle output
Variable shape of both waveforms
Hi/lo range switch
Lowest frequency : +/- 30 seconds cycle
Highest frequency : +/- 30Hz
Frequency LED

Sample & hold
Clocked by either LFO (3 position switch 1 - off - 2)
Sample input via the meter column
Slew limiter with rate pot and lin/log response switch
Normal output
Slewed output
Clock LED

2 identical modulation busses
Individual level pot for each output of the LFO's and S&H
Left bus routed to input channel 1
Right bus routed to input channel 2
Mixed output inverter switch
Level LED

2 attenuverter pins
Scale and invert signal

Gate output
Fires the Synthi's envelope generator by either LFO (3 position switch 1 - off - 2)

I'll try and do a potable video demo, Todd Barton no longer owns a Synthi unfortunately. ;)

The card will be available pre-built and for DIY.
I'm not able to ship pre-built cards currently because of the virus crisis but feel free to drop me a message via http://www.portabellabz.be/papa.html if you want to join the waiting list for a pre-built card or to purchase a DIY PCB set of the very first run (some small fixes are needed and will be documented, nothing complicated).
Last edited by papz on Mon Mar 30, 2020 11:18 am, edited 3 times in total.
Finest EMS gear service and Music Easel/208 goodies

I'm not a synths dealer and I'm not aware of an inexpensive Synthi secret market, please don't ask me if I know one for sale.
I don't offer support of any kind to people attempting to build clones of EMS equipment.

sleestack808
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Re: Every SYNTHI needs a Sister Card

Post by sleestack808 » Wed Mar 25, 2020 8:04 pm

really cool!

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01235813
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Re: Every SYNTHI needs a Sister Card

Post by 01235813 » Thu Mar 26, 2020 6:35 am

Cheers Constantin!

Can't wait to see some video clips of this card in action! :sb:

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deltaphoenix
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Re: Every SYNTHI needs a Sister Card

Post by deltaphoenix » Thu Mar 26, 2020 7:06 am

Agreed, a video could push me over the edge!

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jondent
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Re: Every SYNTHI needs a Sister Card

Post by jondent » Thu Mar 26, 2020 7:30 am

looks good papz

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Thu Mar 26, 2020 12:05 pm

Thanks !

Here's a small very basic demo of oscillator 1 frequency modulated by the Sister Card's bus 1.
It starts with LFO1 triangle and square, LFO2 is added.
At 1:00 the S&H samples the noise patched via the meter column, normal and slewed outputs, then S&H + LFOs.
At 2:00 I patch the trapezoid fired by LFO2 using an attenuverter pin and then I add bus 1.
At 3:10 back to S&H, the LFO shape changes the "swing" of the modulation.

The input channel 1 level is set to around 6, stronger modulations are possible.



Sorry for the shake in the middle and the phone sound quality. :oops:
Finest EMS gear service and Music Easel/208 goodies

I'm not a synths dealer and I'm not aware of an inexpensive Synthi secret market, please don't ask me if I know one for sale.
I don't offer support of any kind to people attempting to build clones of EMS equipment.

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01235813
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Re: Every SYNTHI needs a Sister Card

Post by 01235813 » Fri Mar 27, 2020 10:19 am

What a beautiful synth.

Awesome sounds in that clip, cool demonstration. Thanks for posting.

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captnapalm
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Re: Every SYNTHI needs a Sister Card

Post by captnapalm » Fri Mar 27, 2020 11:18 am

:cloud: :yay: :hail: :goo:

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doepferiano
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Re: Every SYNTHI needs a Sister Card

Post by doepferiano » Fri Mar 27, 2020 12:07 pm

CRAZY! BELLO!

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Fri Mar 27, 2020 12:45 pm

:chug:
Finest EMS gear service and Music Easel/208 goodies

I'm not a synths dealer and I'm not aware of an inexpensive Synthi secret market, please don't ask me if I know one for sale.
I don't offer support of any kind to people attempting to build clones of EMS equipment.


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weinglas
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Re: Every SYNTHI needs a Sister Card

Post by weinglas » Fri Mar 27, 2020 3:59 pm

Wow! Now I am even more sad that I don't have a Synthi ...
Album with Kozepz:"FRNDS"
"All Tubes"
"Game Over!"
mirarimusic wrote:... This fucking blows away Beyonces release today as well!!!!
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Videos

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Fri Mar 27, 2020 4:26 pm

Time to get one :sb:
Finest EMS gear service and Music Easel/208 goodies

I'm not a synths dealer and I'm not aware of an inexpensive Synthi secret market, please don't ask me if I know one for sale.
I don't offer support of any kind to people attempting to build clones of EMS equipment.

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