Wave Runner Rev4 Build Doc

Frequency central
Build documentation for:
Wave Runner
Powered by Electric Druid code exclusive to Frequency Central
Wave Runner is a multi-waveform sync-able LFO based on the Electric Druid TAPLFO2D family of
code, but with some significant additions and improvements. The TAPLFO2D-FC PIC is not
compatible with similar modules, and was developed specifically for the Wave Runner.
Please note that the Wave Runner PCB incudes pads for either 9mm pots or 16mm pots. If you’re
using my 4HP panel you’ll need to use 9mm pots. Be sure to install them into the correct pads,
indicated by boxes on the PCB.
Oh yeah, you’ll see on my build (below) that I used B10K pots, just because I have a metric shitload
of them – Wave Runner is not fussy, you can use B10K, B50K, B100K etc. I mention this because in
the past I’ve found that a few stores seem to be regularly out of stock of B100K.
Bill of Materials
1K x 7
4K7 x 1
10K x 2
12K x 2
33K x 2
47K x 1
91K x 1
100K x 2
22pF x 2
2.2nF x 1
4.7nF x 1
10nF x 2
100nF x 9
10uF electrolytic x 2
47uF electrolytic x 2
TL084 x 1
BC547 x 1
78L05 x 1
79L05 x 1
1N4148 x 3
3mm red LED x 1
20MHz crystal x 1
B100K x 4*
*pads provided for either Alpha
9mm or Alpha 16mm pots. For
4HP panel use 9mm pots.
10K trimmer
Trimmer is multiturn, like this
Sockets x 4
Easy – just populate the PCB! Please observe correct polarity for all ICs, transistors, diodes and
electrolytic capacitors.
Mounting onto the panel
 Mount the two lowest sockets (LFO, CLOCK) onto the panel with the ground tabs pointing
 Bend the short leg of the LED by 90° and push it through it’s hole. The bent leg should meet
the sockets.
 Use a resistor leg to connect the two socket grounds to the bent leg of the LED.
Mount the two highest sockets (LEVEL, SYNC) onto the panel with the ground tabs pointing
Use a resistor leg to connect the two socket grounds to the bent leg of the LED, allowing the
resistor leg to extend out from the panel by 15mm or so (see photo below)
Gently bend over the LED leg that’s sticking up by 90°, making sure it’s 5mm or so above the
panel (see photo below).
Grab the PCB, push the ground wire (that you created from the resistor leg) through the pad
marked Gnd on the PCB, and the LED leg through the pad marked LED on the PCB.
Push the pots into their holes, and mount them with their washers/nuts.
Take up any slack on the ground wire and LED leg, solder in place.
Wiring the PCB to the sockets
Connect to ground wire
Connect to LED leg
Connect to SYNC socket
Connect to CLOCK socket
Connect to LFO socket
Connect to LEVEL socket
Connect to LEVEL switched lug
No connection for these four
The 10K trimmer right by the power header is for Level CV zero offset. Correct set calibration
ensures that the output from the LFO socket is spot-on at 0V when the Level CV input sees 0V. This is
particularly important when using Wave Runner as a pitch vibrato source into a VCO with a mod
wheel controlling LFO depth via the Level CV.
1. Hook up the LFO output to a DMM
2. Ground the Level CV input
3. Adjust the trimmer until your DMM reads exactly 0V
RDH 31/05/14