Hoi
Ik heb een nieuwe mod voor Synthi A en VCS3 gedaan.
Gemakkelijk en eenvoudig zelfs te plaatsen.
Kit zou 100€ kosten, hopelijk beschikbaar end januari - begin februari.
PB me als je interesse hebt.
Sorry, ik zal meer infos in Engels geven, alles in Nederlands vertalen zou lang en moeijlijk voor mij zijn
Simple Random Voltage Generator / S&H for Synthi A & VCS3.
The mod uses 2 push-pulls on both noise pots.
No extra holes needed and 100% reversible, as usual.
As long as the mod is not enabled by pulling the push-pull pot, the Synthi works exactly as unmodified.
There are 2 wiring options.
1. The "RVG" hard wiring option.
Colour knob selects the trigger : osc 3 or trapezoid.
Level knob selects the output to matrix : noise or random voltage.
The pots are still active and make possible to adjust the output random voltage (more low or high CV and intervals).
Here are some audio demos (I recommend to download the ogg files) with elaborated patches.
What you hear is only Synthi A playing live, no external device, no KS, no sequencer.
Panned left - right because recorded at the phones out of the Synthi A.
https://soundcloud.com/trapzoid/1-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/2-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/3-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/4-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/5-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/6-1?in=trapzoid/sets/rvg-synthi-demos
And a basic video with a basic patch, sorry for the quality (when I patch and film together, both results are so poor
ombie: ), but it shows how it works...
In the first part, patch is osc1 sine > output ch and RVG > osc 1 frequency.
In the second part, osc1 > filter > envelope > output channel and RVG > osc 1 frequency, filter frequency (with inverter pin), decay and osc 3 frequency.
The LEDS won't be on the offered PCB.
[
2. The " S&H" wiring option
The circuit's input is connected to the "meter" column and output to the "input ch. 2" row in place of the hard wiring, it works fine.
This way you can send any source signal you like into the S&H input.
With this option user might want to use a shorting pin in place of a 2k7 resistor pin to have a larger signal sent to S&H input and thus a wider CV range at its output (easy to do with a common pin, simply replace its resistor with a wire).
PCB
I plan to do a small run and offer for sale a populated PCB mounted to the 2 push-pull pots, user will simply have to replace the 2 original pots with this kit and run a few wires to the trigger sources and power rails.
Not exactly plug and play but it should be quite easy, even without a big experience in soldering.
The PCB would offer choice between both "RVG" and "S&H" wirings and fit as well Synthi A and VCS3 pots spacing.
It will of course come with clear and detailed installation instructions.
Ik heb een nieuwe mod voor Synthi A en VCS3 gedaan.
Gemakkelijk en eenvoudig zelfs te plaatsen.
Kit zou 100€ kosten, hopelijk beschikbaar end januari - begin februari.
PB me als je interesse hebt.
Sorry, ik zal meer infos in Engels geven, alles in Nederlands vertalen zou lang en moeijlijk voor mij zijn
Simple Random Voltage Generator / S&H for Synthi A & VCS3.
The mod uses 2 push-pulls on both noise pots.
No extra holes needed and 100% reversible, as usual.
As long as the mod is not enabled by pulling the push-pull pot, the Synthi works exactly as unmodified.
There are 2 wiring options.
1. The "RVG" hard wiring option.
Colour knob selects the trigger : osc 3 or trapezoid.
Level knob selects the output to matrix : noise or random voltage.
The pots are still active and make possible to adjust the output random voltage (more low or high CV and intervals).
Here are some audio demos (I recommend to download the ogg files) with elaborated patches.
What you hear is only Synthi A playing live, no external device, no KS, no sequencer.
Panned left - right because recorded at the phones out of the Synthi A.
https://soundcloud.com/trapzoid/1-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/2-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/3-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/4-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/5-1?in=trapzoid/sets/rvg-synthi-demos
https://soundcloud.com/trapzoid/6-1?in=trapzoid/sets/rvg-synthi-demos
And a basic video with a basic patch, sorry for the quality (when I patch and film together, both results are so poor
ombie: ), but it shows how it works...In the first part, patch is osc1 sine > output ch and RVG > osc 1 frequency.
In the second part, osc1 > filter > envelope > output channel and RVG > osc 1 frequency, filter frequency (with inverter pin), decay and osc 3 frequency.
The LEDS won't be on the offered PCB.
[
2. The " S&H" wiring option
The circuit's input is connected to the "meter" column and output to the "input ch. 2" row in place of the hard wiring, it works fine.
This way you can send any source signal you like into the S&H input.
With this option user might want to use a shorting pin in place of a 2k7 resistor pin to have a larger signal sent to S&H input and thus a wider CV range at its output (easy to do with a common pin, simply replace its resistor with a wire).
PCB
I plan to do a small run and offer for sale a populated PCB mounted to the 2 push-pull pots, user will simply have to replace the 2 original pots with this kit and run a few wires to the trigger sources and power rails.
Not exactly plug and play but it should be quite easy, even without a big experience in soldering.
The PCB would offer choice between both "RVG" and "S&H" wirings and fit as well Synthi A and VCS3 pots spacing.
It will of course come with clear and detailed installation instructions.
