Project
Projecttitel: RSF KOBOL Clone
Status: FINISHED
Startdate: 01/2019
Duedate: 02/2020
Updated: 02/2023
Manufacture link: deliandiver.com
https://www.muffwiggler.com/forum/viewtopic.php?t=203509&highlight=
Summary:
works, but its not for beginners and until the developer do not change the PSU from Main AC to Walwart psu its definitely not for beginners.
you need 2x SSM2050 or use 2055/2056 with a mod.
This documentation is only for myself, to have some notes about changes and mods
This PCB which I used isn't available anymore !!
Theres no support available and much knowledge needed.
Sync sounds:
Backup from Crazy.P incl. SSM.-SSI adapter pinout
ISSUES
| Nr. | Description | Priority | Solution | |
|---|---|---|---|---|
| 1 | Switches - use other pcbs footprint size and/or change panel to toggle switch | 1 | ||
| 2 | BOM : LOG for Volume LFO and VP out gain | 3 | fixed | |
| 3 | missing mounting holes for pcbs | 2 | open | |
| 4 | LED driver needed for gate led | 2 | fixed | |
| 5 | leds polarity on pcb | 3 | fixed ? | |
| 6 | LFO speed inverted pot, left is fast on the prototype | 1 | Or use reveresed Poti | fixed |
| 7 | panel holes too big for potis | 1 | open | |
| 8 | powersupply design not allowed - | 2 | open - use a own PSU - Yamaha PA30 and resctifier, capactitors | |
| 9 | markers for voltage test points missing | 3 | open | |
| 10 | more clearly infos about matched trannys and resistors | 3 | ||
| 11 | envelope change too CEM3310 or digital | 1 | open | |
| 12 | capacitors are too close next to the power supply section on mainboard | 1 | fixed | |
| 13 | use bigger traces | 1 | open | |
| 14 | Gate signal bleed in LFO | 1 | Blocker | fixed |
| 15 | V/oct unstable - waveforms wobbling - | 1 | Blocker | fixed |
| 16 | Lfo led not working | 3 | fixed | |
| 17 | Holes in vcf board and VCO board to mount on metal spacers - for better mounting | 2 | open | |
| 18 | Case doesn't fit with the panel | 1 | workaround possible | |
| 19 | ua726 | 1 | use normal matched pair trannys | |
| 20 | ssm2040 | 1 | use the new SSI 2040 !! | |
BOM: 11-2020
changes:
in crazy.p clone R135 ---> 68pF
in Crazy.p clone R207 ---> 22nF
wiring panel 11-2020
Project schematics RSF Kobol Expander I Clone.pdf
Switches
needed: 1x 2 rows with 3 pins (ON/OFF) power (DPST)
| mouser | RS | ||
|---|---|---|---|
| power | SSSU022800 | ||
| 4x normal | SSSU015100 |
or:
| mouser | ordered  | ||
|---|---|---|---|
| power | MHS222K not avail. | 06-MHS22204 | https://www.kynix.com/Detail/176774/MHS222K.html |
| 4x normal | MHS122Kapem | home stock | |
| Nr | ||||
|---|---|---|---|---|
| Pots | 50€ | |||
| jacks | 35€ | |||
| resistors | 30 | |||
| capacitors | 2,2MF | reichelt | 30€ | |
| ICs: 3080, lm324, lmxxx | estimated 100€ | |||
| trannys, Power reg. | 5 | |||
| diodes | 1 | |||
| switches mouser | 10 | |||
| cable | 5 | |||
| SSM2050 | 2x | 480€ or ask me for a replacement VCA/ADSR PCB to use CEM3310/AS3310 | ||
| cooler | 5 | |||
| external Yamaha PA30 | 50€ | |||
| SSM2040 | Ebay 50 or use new SSI2140 with adapter 10€ | |||
| case | Buchla boat from SAMODULAR - cut the frame to make it fit 100€ | |||
| ic sockets | 10-15€ |
Schematics:
ob_345da9_schemas-carte-kobol-expander-1.pdf
MODS:
from http://www.crazy-patroche.com/2017/07/etude-des-racks-rsf-expander-1.html
in case of the SSM2050 (2x needed)
you can use SSM2055/56 with changes
https://oshpark.com/shared_projects/N9Tw7FAP
or by hand wiring
Pin 2 to GND not shown - importend
Final Pictures:
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