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 : http://www.portabellabz.be/images/sq1/M ... pgrade.pdf

http://www.portabellabz.be/sister.html

The card is available is available pre-built (waiting list - €350 + shipping) or as a DIY PCB set (€95 shipped).

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 : +/- 25 seconds cycle
Highest frequency : +/- 90Hz
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 CV output
Slewed CV output
Clock LED

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

Handle support
Small plates can be mounted to the back to lock the Spartanite case's handle for better stability.

It is possible to add a female socket onto the top side of the Sister Card.
The card's and KS (or Kenton type Jones-jack sockets cable) CVs are mixed passively via the 100k resistors present on the card's CV outputs and in the KS cable to modulate the incoming CV. Gates from the keyboard and sequencer, from the card and from the Synthi's EG self-retrig are mixed.
With all the card's pots set to 0 and the gate switch in central position, the incoming CV/gate signals are not impacted.
Last edited by papz on Fri Sep 04, 2020 7:23 am, edited 13 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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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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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!!!!
dan_p wrote: I'll still be listening to this one in years to come. best thing I've heard for ages
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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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Sun Apr 05, 2020 8:13 am

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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deltaphoenix
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Re: Every SYNTHI needs a Sister Card

Post by deltaphoenix » Sun Apr 05, 2020 9:38 pm

That was really nice, Papz!

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Mon Apr 06, 2020 1:39 am

Thanks !
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 » Mon Apr 06, 2020 3:24 pm

I really enjoyed that!

Being that I have limited knowledge of the workings of a synthi, I cannot really comment on the card. I can say that it was a great performance. It's always a pleasure to see someone throw down a killer groove with a synthi.

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Re: Every SYNTHI needs a Sister Card

Post by nidas » Tue Apr 07, 2020 6:10 am

Great demo and nice build with the card. I want one!!
Would it be possible to still control with cv / gate from controller like DK / KS / whatever can send correct CV / gate.. with the card plugged in?

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Tue Apr 07, 2020 6:51 am

Thanks for the feedback !

Yes it is possible, a female socket can be added onto the top side.
The card's and controller's CVs are mixed passively via the 100k resistors present on the card's CV outputs and in the controller cable (umbilical or Kenton-type). The card can thus modulate the incoming CV.
Various gates can be mixed as well, including the Synthi's EG own self-retrig signal.
With all the card's pots set to 0 and the gate switch in central position, the incoming CV/gate signals are not impacted.


IMG_1158.resized.JPG
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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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Sat Apr 11, 2020 9:34 am

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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Re: Every SYNTHI needs a Sister Card

Post by Acquadar » Mon Apr 27, 2020 1:54 pm

Papz on the Synthi of the videos there is a blue knob on the upper-left side of the matrix. What kind of mod is that?

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Mon Apr 27, 2020 2:04 pm

It's variable oscillator sync.
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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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Fri May 22, 2020 4:22 pm

The new error free DIY PCB sets are available.
Price for the set is €95 shipped.
Last edited by papz on Mon May 25, 2020 10:06 am, edited 1 time 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.

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papz
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Re: Every SYNTHI needs a Sister Card

Post by papz » Mon May 25, 2020 9:47 am

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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Posts: 343
Joined: Tue Dec 02, 2014 10:45 am

Re: Every SYNTHI needs a Sister Card

Post by sleestack808 » Thu Jun 11, 2020 4:46 am

Please add one cv /gate . I'm buying one of these, but I really want a cv gate. Just one. If not possible how about something that can sync the trapezoid to a gate signal?

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