A Look Inside the Finished Unit

I’ve just completed the wiring and testing of the MIDI functionality. In my previous automation Mark II box the MIDI hardware was mounted on a small veroboard and soldered directly onto the MIDI sockets. In this Mark III version I wired up the MIDI circuit on an Adafruit Protoshield pcb together with the circuitry for an I2C EEPROM which would allow more patches to be stored but is not yet supported by the software.


This shows the ‘stack’ of Arduino-style Shields – saves a lot of extra wiring doing it this way.


The MIDI sockets and the Audio Out socket on the back panel.


This is the MIDI/EEPROM protoshield. I haven’t plugged in the EEPROM yet as there is no support for it in the software.

The only remaining job is to wire the foot-switch socket for up/down preset selection.



4 comments on “A Look Inside the Finished Unit

  1. […] Mark III – is a fully automated unit, with a two channel valve preamp using two 6N3 dual triode valves obtained ready-built from Hong Kong via an eBay seller. The unit uses an interface board designed by Eric Thacker to interface between the preamp, the FV-1 module and the Arduino Uno. […]

  2. […] with the whole ‘stack’ mounted on the front panel via suitable M2.5 bolts and nuts. This earlier post shows what I […]

  3. […] The Adafruit LCD Shield kit which is used in my automation project  is supplied with pcb mounting tactile switches but they are too short to protrude through the front panel with the lcd mounted in the enclosure. Switches with extra-long actuators can be purchased to replace them but I have concerns about the long-term reliability of these little tactile switches so I opted to replace them with off-board panel mounted switches when I built my Valve EchoTapper. […]

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