LAYOUTS. Thomas Henry SSM2164 VCF/VCA v1. Adapter PCB top view (Panel side) Main PCB. Adapter PCB bottom view. 9/13/2016
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1 Thomas Henry SSM VCF/VCA v LAYOUTS The PCB/Panel combo is comprised of one main PCB, an adapter PCB, and an Eurorack format panel. Nevertheless, one can always use just the main PCB to build a module in any other form factor, if desired. The PCB provides MTA-00 headers to make the manual wiring more easy. Use pin and pin SIL connectors to stack the PCBs. The part designators follow the original schematic as published in the book An Analog Synthesizer for the st Century, however, I added a few features and parts. Therefore a complete new BOM and schematic are included in this documentation. The designators on the adapter PCB correspond to the designators on the main PCB/schematic, they just show the index A (for Adapter). Main PCB Adapter PCB bottom view Adapter PCB top view (Panel side) 9//0
2 Thomas Henry SSM VCF/VCA v Main PCB BOM Adapter PCB Qty Value Package Parts Notes Resistors 0R 00/ F, F or ferrites 0R 00/ R - R k 00/ R - R9 k 00/ R0 PTC (tempco) +00ppm/C.k 00/ R k 00/ R 0k 00/ R - R k 00/ R8, R9 00/ R0 - R8, R8_B, R9 0k 00/ R 0k 00/ R8 00k (V) 00k 00/ R9, R0.M 00/ R 00R SY/W R V/oct Trimmer Capacitors 0pF C00-0X0 C, C pf C00-0X0 C 00pF C00-0X0 C - C C0G/NP0 0pF C00-0X0 C8 - C 0 00n C00-0X0 C/B, C/B, C/B, C/B, C, C 0n C00-0X0 C8, C9 Film 0uF E,- C, C Elec, Vmin Semi's BAT8 DO- PD N8 DO- D, D SSM DIL IC or V TL0B DIL08 IC - IC or OPA Misc Eurorack power header MTA- power header When using the adapter PCB use SIL connectors. Qty Value Package Parts Notes Potentiometers 8 vertical 9mm R0A - RA, RBA M vertical 9mm RA VCF Sockets AUDIO INPUT PJ-0B JA ENVELOPE CV PJ-0B JA V/OCT PJ-0B JA HIGH PASS PJ-0B JA BAND PASS PJ-0B JA LOW PASS PJ-0B JA VCA Sockets LINEAR AM PJ-0B JA ENVELOPE CV PJ-0B J8A AUDIO INPUT PJ-0B J9A DC INPUT PJ-0B J9BA SYNTH OUT PJ-0B J0A AC/DC Miniature SA Switch SPDT on-on The assembly is straight forward. Nothing special to consider here. For the actual filter caps C & C I use C0G/NP0 which show almost the same characteristics as polysterene type caps. The 0n caps are in the audio path, I use boxed film caps. All the 00n caps are just for decoupling and one could use any type of ceramic cap here. In general I use linear potentiometers all over the place. Nevertheless, you might want to use a reverse log pot for resonance. Not a must, though. If you don t need/want temperature compensation use just a common k for R0. That s what I did. For F/F normally ferrite beads are used, however, one could use 0R or 0R resistors as well, which would work as kind of protection, if made an error in the build (short) or the power supply of the module. The adapter PCB is made for PJ-0B jack sockets. Don t use any other socket with this PCB unless you are absolutely sure the pinout is identical. 9//0
3 Thomas Henry SSM VCF/VCA v INTRODUCTION In 98 Thomas Henry published a book called Build A Better Music Synthesizer, which enabled the reader to build himself a music synthesizer. It covered all basic synthesizer modules and made use of state-of-the-art integrated circuits of that time (i.e. CEM). About 0 year later in 00 Thomas Henry once again published a book called An Analog Synthesizer for the st Century, which again contained circuits for all basic synthesizer functions (available via lulu.com). This time Thomas Henry made use of commonly available integrated circuits of this time. However, for the VCF and VCA the SSM was used, a high quality quad audio VCA. Meanwhile this IC is used a lot by Intellijel and Behringer, which kept the IC in production. In the past years I provided PCBs and Panels for various Thomas Henry projects, alas, there has not been a filter yet. So now, here we go with the VCF/VCA from the above mentioned book. As always Thomas Henry provides circuits for musically usable modules, and it is my pleasure and privilege to have the permission to provide PCBs and Panels for this project. The VCF is a vanilla -pole db Stave Variable filter, which could be used as V/oct sine wave VCO when in self oscillation. The linear VCA has both an DC coupled input and a selectable AC or DC coupled input, which is normalled to the LP output of the VCF. Matthias Herrmann, Sep 0 9//0
4 Thomas Henry SSM VCF/VCA v Layouts (Reference) 9//0
5 Thomas Henry SSM VCF/VCA v Manual Wiring The manual wiring is quite straight forward, I guess. The PCB provides footprints for MTA-00 headers to make thing more easy. If you use them, make sure to get MTA-00 plugs that could be stringed together! In the picture to the right I give only wiring examples for a few components. All in all this is rather self explaining, I believe. Please, take note that the resonance pot has to be wired backwards. Refer to the schematics to see and decide what you need. Attention! Resonance pot has to be wired backwards! 9//0
6 SpiceOrder SpiceOrder SpiceOrder SpiceOrder J R0 ENVELOPE R J V/OCT +V COARSE R -V +V FINE R R9 k R R 0k R.M R8 k C pf D N8 ICB TL0B J AUDIO INPUT D E A R N8.k R 00R V/Oct Trim S C8 0n R0 ICA TL0B R0 k +00ppm/C R C 0pF R ICA TL0B R R k R 0k J HIGH PASS IC_A R 0R C8 0pF R R M SSM C 00pF ICA TL0B R k R 0k BAND PASS IC_B R 0R C9 0pF J SSM C 00pF ICA TL0B R8 k J LOW PASS -V J LINEAR AM R R8 0k (00k) -V R RESONANCE db State Variable linear VCF VCA INITIAL J8 R ENVELOPE J9 INPUT +V -V C9 0n S AC/DC R R0 00k R R9 00k -V R 0R C0 0pF IC_PWR IC_C SSM IC C 00n C 00n PD BAT8 +V IC -V 8 C 00pF TL0B ICB CB 00n CB 00n DC input IC 8 J9B R8 R8_B IC C 00n C 00n 8 C 0pF R9 ICB TL0B CB 00n CB 00n 8 IC R 0k C 00n C 00n R 0R C 0pF + + IC_D SSM F 0R or ferrite +V GND MTA- F -V 0R or ferrite C 00pF R 0k ICB TL0B EURO-0 EURO-9 EURO-8 EURO- EURO- EURO- EURO- EURO- EURO- EURO- R9 k R LINE k J J0 SYNTH THOMAS HENRY VCF/VCA First published in "An Analog Synthesizer for the st Century" (C)00 Redrawn schematic by Matthias Herrmann 0.0
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