• Eurorack module prototyping and testing power supply thing: Part 3
    In part 1 we decided I need a power supply and picked out a few basic components. In part 2 we looked at display and control.  And now we’re going to start looking at current measurement. For the purposes of discussion I’m going to divide current measurement up into three parts: Analog to Digital Converter, […]
  • Eurorack module prototyping and testing power supply thing: Part 2
    Previously we decided I needed a better lab power supply for working synth modules; picked out a switch mode power supply to do most of the heavy lifting,, a case, and desirable output terminals. This time we’re going to look at the electrical design that will generate the three output voltages ±12 V and 5 […]
  • Eurorack module prototyping and testing power supply thing: Part 1
    I was looking at my workbench not too long ago And I thought if I had a ‘real’ power supply with banana jack connectors most of this rat’s nest would get cleaned up. In addition to the mess, the ATX supply + converter board has some other problems. Most notably that the 24 pin cable […]
  • Chord Arpeggiator Design: Part 3
    Previously in part 1 we diagramed a state machine to represent a chord arpeggio. In part 2 we determined what the sum of products would be for the state transition logic, and simulated the logic. Now it’s time for the next step which is to look at the physical implementation. I spent some time KiCAD […]
  • Chord Arpeggiator Design: Part 2
    Last time I started designing a chord arpeggiator. We got as far as and articulating the specifications and then drawing a state machine to handle note transitions. Today we’ll try to minimize the gate count for transitioning between states and then simulate the logic using VHDL. Logic Minimization I decided to use Karnaugh Maps because […]