Frequency Central Waverider Digital VCO Manual

Frequency central
Build documentation for:
Waverider digital vco
Based on the Electric Druid PIC 16F1847 VCDO1:
http://www.electricdruid.net/datasheets/VCDO1Datasheet.pdf
B10K B10K B10K B10K B10K B10K
Ground (Gnd), Sub (output), >>>
Main (output), +5V, Glide (in).
8 way ribbon
B100K B100K B100K B100K
<<< Sub, Wave, FM and 1V/oct CV input pads,
Ground pad (Gnd).
8 way ribbon
Three fat access holes for calibrating the >>>
trimmers ‘from behind’with a jeweller’s
screwdriver.

Things to note on the photo below:
-8 way ribbon between the two PCBs
-Ground bus connecting all sockets and terminating in the CV PCB Gnd pad.
-CV inputs x 4, solid core to CV PCB pads.
-Glide LED, the 1K CLR (inside the black heatshrink) connects between the LED anode and the
Glide input, the LED cathode connects to the ground bus.
-Sub Out, solid core from main PCB.
-Main output (orange wire).
-+5V to glide socket’s normalise lug (red wire).
-Glide in (brown wire).

Glide status LED
Glide is ‘always on’ providing there is no jack in the Glide input socket as the normalise lug of the
socket receives +5V from connection to the Main PCB, the glide amount being determined by the
Glide knob. Inserting a jack into the Glide input socket disables ‘always on’, and Glide will only occur
when the Glide input socket receives a +5V gate signal. The Glide status LED (and a CLR/limiting
resistor, I use 1K) is connected between the Glide input lug and ground.
Tracking/calibration procedure
-Send a 1V/oct source into Frequency CV input, set the Frequency CV input attenuator fully
clockwise. Set Glide fully counter-clockwise.
-On plug-in with all trimmers in the mid position you should find that the bottom notes of a 5
octave keyboard don't do anything. So, trill between bottom C and C#, and adjust the Offset
trimmer until both notes sound. You've just set up the CV offset.
-Play a couple of C's an octave apart towards the middle of the keyboard, adjust the 1V/oct
trimmer until they are true. Then play every note on the keyboard, listen for any trilling
notes - that means the note isn't quite sure what it wants to be. Fine tune Offset trimmer
and 1V/oct trimmer until everything is cool, playing octaves and finally every damned note!
-Set Detune knob to 12 o'clock, match Waverider to a known pitch source using Zero
trimmer. If you have an O'Tool = even easier: play an A on the keyboard, find a note close to
A4 on the Frequency pot, adjust Zero trimmer to 440Hz.
-Takes about 5 minutes...!
Bill of Materials
1K x 8
4K7 x 4
10K x 4
20K x 4
27K x 4
51K x 2
91K x 2
100K x 8
180K x 1
200K x 5
150pF x 2
330pF x 6
100nF x 10
2.2uF x 2
47uF x 2
VCDO1 PIC x 1
TL072 x 3
TL084 x 1
BC547 x 1
78L05 x 1
79L05 x 1
B10K x 6
B100K x 4
All pots are 16mm Alpha
20K trimmer x 2
47K trimmer x 1
All trimmers are 6mm
(Tayda)
Please observe correct polarity of the electrolytic caps, voltage regulators, transistor, ICs etc!
RDH 21/05/13
http://www.frequencycentral.co.uk/