Ideas for potential upgrades or customizations
Adding CV inputs
Since the Electric Druid FLANGE chips operate using 0-5V control voltages like many other Druid
chips, it is possible to add CV control of the Frequency, Depth, or Rate controls.
Adding Expression pedal inputs
It is also possible to use an expression pedal in place of
the pots. If a normally-closed stereo/TRS jack socket is
wired in, the front panel control can be used when an
expression pedal is not inserted.
The typical expression pedal wiring is for the Sleeve to
be grounded, the Ring to carry the reference voltage,
and the CV return on the tip. The diagram shows how
this wiring relates to the PCB, the jack, and the pot.
However, this is not the only possible wiring,
and expression pedal may not be this way!
Don’t worry too much about this wiring. So long as you
only use passive expression pedals, you can’t hurt
anything, even if it’s completely wrong. If you get it back-
to-front before you get it the right-way-around, no
matter.
Both versions of the chip allow you to manually sweep
the flanger with the farthest-left control (Manual or
Rate). Connecting an expression pedal instead of this
control would give you a foot-pedal wah-style flanger.
Adding more switches and options
Both the MULTI FLANGE and the 4 KNOB FLANGE make use of the switch input marked “Tap”
on the PCB. This input should have a switch which connects it to ground.
The MULTI FLANGE chip offers the option of top-down or bottom-up flanging. The switch could
be a slide or toggle, or could be added as a footswitch. The switch should be latching.
The 4 KNOB FLANGE chip uses the “Tap” input to reset the waveform phase to zero. This allows
you to keep the flanger in time, or can be used as a special effect, since you get a downsweep after
you tap. This input needs a momentary switch, and might be most useful as a footswitch.
Flangelicious Construction Guide
www.electricdruid.net
Page 10
