Renderings of each of the modules

I found myself going down a rabbit-hole of 3D rendering products and techniques when I’d rather be building synthesizers, so I’ve opted to present each module in the simple Kicad render. The first System 300 will come with 12 modules shown below.

  • 2x AT-317 VCO
  • 1x AT-314 LP VCF
  • 1x AT-327 Multimode Filter
  • 1x AT-315 Balanced Modulator
  • 1x AT-318 Sample & Hold/Clock/Noise Generator
  • 1x AT-324 Dual LFO/Lag/Inverter
  • 1x AT-323 Dual Mixer
  • 1x AT-321 Hex Attenuator
  • 1x AT-316 VCA
  • 1x AT-312 Envelope Generator
  • 1x AT-326 Output Module



The new boards

Sent off the penultimate prototype boards to manufacturing this morning.

Here are 3D renderings of each.




Feeling very pleased with the layout. Should prove easy to assemble, and have good noise rejection characteristics.

The final version of VCO board will be SMD, and organized for robotic assembly, but I wanted to begin with a through-hole version; both to verify the circuit design and basic layout, and to make available to interested builders who don’t enjoy SMD work.

Also created a Bill Of Materials (for this morning and put in an order so I can validate it before publishing.

Waiting on the good folks up at KrlBantry in Manchester, NH, to deliver a batch of custom spec 3k Tempco resistors. Should have the first batch in early August. At the moment, the prototype experiences frequency drift as the transistors in the Exponential Converter heat up. Going to thermally bond the 3 transistors in the Expo Converter to the Tempco, and pack it in some kind of foam or potting material, to minimize thermal gradients between them. This is the way Dennis Colin did it in the AR-317 and it works extremely well.

An homage to Dennis Colin and the Aries System 300 modular synth

I’m putting together this site to share information about the development of the Alpha-Trianguli System 300 series of analog synthesizer modules. The design goal is to make a series of modules that closely match the original specs of the Aries System 300 modules.

Aries Music was a Massachusetts based company that designed and sold synthesizer module kits in the late 70’s and early 80’s. Many of the modules were designed by Dennis Colin, the famed designer of both the ARP 2600 and the multimode filter found in Tom Oberheim’s SEM modules.