Penultimate VCO boards

I received the final prototype boards on Monday, and assembled the first one using parts from the test BOM (Bill-Of-Materials) order. The purpose of doing this is to make sure the Bill-Of-Materials and the board are correctly specified, so that when I send the order to manufacturing, I can expect it to work.

It didn’t work at first, which was cause for concern, but it turned out that one of the PNP transistors was no good. Once I had replaced it, everything worked perfectly.

Once the Tempco resistors have arrived (mid-August), I will build the rest of the boards, and send them off to my test subjects.

This slideshow requires JavaScript.

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