A photo diary of building the Echotapper I built for Henri-Claude Hanoun.
Most of the parts are here except the valve preamp
The kit for Piet’s Universal I/O Shield.
Fit the resistors and diodes first. (Ensure diodes go in the right way round). We don’t need the 10K resistors
I fitted the connector headers next. If you are fitting an off-board MIDI circuit, add another 4-way header to the lower half of the ‘LCDP’ location on this pcb.
Now add the six film capacitors
Before soldering the headers to Piet’s shield, mount it on top of the Arduino to make sure the pins line up, then solder the two end pins on each header to hold it in place, take the shields apart and solder the rest of the pins.
The completed I/O Shield
The kit for the Adafruit LCD/Keypad Shield
The left-over parts aren’t required 🙂
The coupling capacitor between the input triodes is removed …
… and replaced with this little circuit
Leave the outer leads on the two capacitors long as they’ll be used to connect the board where the coupling capacitor used to be.
The replacement coupling circuit in place. The back lead is later soldered to ground on the underside of the preamp pcb.
The bits for Eric Thacker’s Eccamatic pcb.
Don’t forget to solder the ‘missing link’
The completed ‘Eccamatic’ pcb. The eTap2hw module fits on here
The preamp is now here and all the other modules are build and tested 🙂
The wiring of the controls on the front panel.
and the user’s view of the front panel 🙂
A two-button foot-switch is a handy way to change patches on the Echotapper and I finally got around to wiring one up for myself. You’ll need to add a 1/4″ (6.3 mm) stereo jack socket to your Echotapper and wire this to the Up and Down buttons (or the Up and Down pads on the LCD shield pcb if you don’t have Up and Down buttons – see following photo).
Wiring the foot switch socket to the LCD shield. White = Down, Green = GND, Red = Up
At the Jack socket, connect the UP wire to to the tip terminal, the DOWN wire to the ring and the GND wire to the sleeve terminal.
The foot switch consists of a small die-cast box (approx 110 x 60 x 30 mm) with two momentary foot switches and a stereo 1/4″ jack socket (you could omit this and wire a suitable length of three core cable directly to the switches).
Wiring inside the foot switch is simple.
Maybe I’ll paint it someday 😉