Monthly Archives: February 2013

Wiring Up the Prototype

Impatient to hear what this thing would sound like, I had a ‘hoke’ through my garage to find a suitable box to put it in for testing. The only thing I could find was an old die-cast box which once held a radar sensor from a burglar alarm I had built years before. It had been part of a system I had installed in a local shop but this one had been zapped by a lightning strike and had been replaced!

I ripped out the old guts, drilled some new holes for the pots and stuck the BCD edge switch to the side with a mass of duck tape 🙂

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It didn’t work at first but, after fixing a bad solder joint , success!! We got echos, lots of lovely echos and the tone of the guitar seemed to be improved too. Piet has included the fetzervalve circuit in the pre-amp stage so that seems to have improved the tone.

It won't win any prizes for good looks!

It won’t win any prizes for good looks!

The edge switch is stuck on the side with duck tape.

The edge switch is stuck on the side with duck tape.

 

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Building the Motherboard

The instructions are online here

Let's get started with the resistors

Let’s get started with the resistors

All resistors and DIL sockets are in. Now to add the film and ceramic capacitors.

All resistors and DIL sockets are in. Now to add the film and ceramic capacitors.

All the major components are now soldered onto the board.

All the major components are now soldered onto the board. The 9V regulator, the 16 pin header for the FV-1 board and some solder pins need to go in.

The 100uF elco was a slightly tight fit against the adjacent DIL socket. Take care not to force it!

The 100uF elco was a slightly tight fit against the adjacent DIL socket. Take care not to force it!

In the Beginning …

The kits arrived! I bought three eTap2Hw kits and additional parts from Newtone.nl – one for me and two for friends to build. The kits consist of a small ‘daughterboard’ containing a DSP circuit and a motherboard to mount this on with support components. The DSP coding is by my friend Piet Verbruggen and he also designed the motherboard. He calls his system the eTap2HW. ‘eTap’ means echo tapper because it is based on the multi-head or multi-tap tape echos from the 60’s and ‘HW’ because it is a hardware implementation of a software plug-in Piet developed some years back.

The box from Newtone with the three kits plus pots, knobs etc. and the package of BCD edge switches from Rapid Electronics.

The box from Newtone with the three kits plus pots, knobs etc. and the package of BCD edge switches from Rapid Electronics.

Most of the parts (clear packs) go on a Motherboard and the echo is done by a FV-1 DSP chip from Spin Semiconductors on a daughterboard by OCT

Most of the parts (clear packs) go on a Motherboard and the echo is done by a FV-1 DSP chip from Spin Semiconductors on a daughter-board by OCT. The pots, jack sockets and knobs are NOT included in the kit.

The kit to build the motherboard.

The kit to build the motherboard.

The daughter-board out of its anti-static bag with the motherboard PCB and a credit card for size - the boards are pretty small!

The daughter-board out of its anti-static bag with the motherboard PCB and a credit card for size – the boards are pretty small!

The Finished EchoTapper Units

I ended up building two units. My prototype has ended up in a nice vintage looking Tolex covered wooden enclosure after I spent the last couple of months adding automation features to the basic echo circuitry. The automation version uses an Arduino Uno, a Adafruit I2C LCD and an interface shield to connect the various bits together in a nice Hammond enclosure.

The most recent addition, and hopefully the last piece of hardware to be incorporated, is a small interface board with MIDI In and MIDI out ports.

The Automation Version

The Automation Version – built in a Hammond extruded Aluminium enclosure

It's recently had MIDI added to it!

It’s recently had MIDI added to it!

The manual unit, front view

The manual unit, front view – it has a real vintage vibe with the tan coloured Vox Tolex.

The Ins and Outs.

The Ins and Outs.