Synton 3000 Series Modules

Synton is a Dutch company that made the 3000 series modules in the 1980s. A complete listing of modules can be found at

I was sent a number of vintage bits and pieces and asked to complete these modules.

3005 EGR (ADSR)

3006 MPL (1 CV in to 4 CV out with attenuators)


3017 VCF (2 pole state variable filter)

3218 INV / SLR (Dual inverter/offset and slew limiter)

3224 Hi/Low Pass VCF

3233 S&H / LFO

3235 ENV / CPR (Envelope follower, comparator, and trigger delay)


Here is the completed set of modules in a Blacet Research 19" rack.



The modules have a fairly standard grid layout and the panel size is 128.5mm high by 81.3mm (16 HP) wide. The modules operate on +/-15V. They have a fairly standard front panel PCB for mounting the potentiometers, banana jacks, switches, and LEDs and are drilled for the various modules.  This panel PCB has been drilled for 4 potentiometers and 6 banana jacks.


I used the original Multicomp 24.247 series banana jacks. It consists of a barrel with a screw-on front and a shroud. The shroud fits on the back of the panel and the PCB is tightened against it holding the PCB to the panel. The potentiometers do not fasten to the panel.

The original construction had the nuts soldered to the PCB. I tried this but it took so much heat that it started to deform the plastic pieces. Once deformed the banana jacks were no longer tight to the panel. In fact some were so loose that I had to apply a bit of super glue to fasten them together.

I decided instead to solder a wire from the rear of the banana jack to the PCB. I had to solder this wire with the plastic pieces removed since it takes so much heat. The plastic cap screws on tight but it is difficult to tighten the banana jacks sufficiently. I bought some additional 1/4-28 nuts to double nut them for a more robust construction.




Later I was asked to expand the rack with additional Synton-format modules. I repaneled a Blacet 2100 and MiniWave and built a Jürgen Haible Frequency Shifter and a custom Preamp/Envelope Follower into narrower Synton panels to fit the remaining rack space. I repaneled the custom Frac WAD I built earlier into a standard size Synton panel. The new modules required a deeper rack than the Blacet so I made one with a Hammond 10.5 x 17 x 13 inch chassis RMCS191013BK1.

Synton-format WAD and narrow Synton-format Blacet 2100 and MiniWave

Narrow Synton-format Jürgen Haible Frequency Shifter

Narrow Synton-format preamp/Envelope Follower


This photo is the new Hammond chassis with the 4 new modules added..


There is plenty of room inside.