____ C9 and C10
Do not install anything in C9 and C10 at this time. They are locations
provided for help with additional circuit-bends.
____ (optional) Functional Test
At this point, the MDRONE should be ready to produce sound. You may want
to test this before going to the trouble of mounting the knobs, switches, and
output jack to the panel. To do so, carefully plug a 1/4” mono audio patch
cable (not included) into the audio output jack. Plug the other end of this cable
into your audio output system -- a mixer, PA amplifier, etc.
Turn o
ff
the Power, OSC 2 and OSC 3 switches. Plug in a 9V battery.
Turn the R11 Volume potentiometer to its center position. Switch on the
Power switch (P5/P8). Turn on the OSC 1 switch. You should hear a constant
tone from your amplifier. Rotate the OSC 1 potentiometer (R16) left and right.
The tone should go down and up in pitch.
Turn o
ff
the OSC 1 switch, and turn on OSC 2. You should hear a tone again.
Now rotate the Osc 2 potentiometer (R20). The pitch should go up and down.
Repeat this for the OSC 3 switch and potentiometer, R1. Now rotate the Filter
Width (R23) potentiometer. The sound color should change. Likewise for the
Filter Frequency (R13) potentiometer.
Finally, rotating the Volume knob should make the sound get louder and
quieter. If all of this works, then it’s time to begin assembling the knobs and
switches to the panel. If not, go back and check your work carefully.
____ Assembling the Controls
Turn o
ff
the power to the SDIY MDRONE. If you are using the optional pre-
made case, follow the case assembly instructions in the case assembly manual.
If you have made your own case, you’ll need to drill six 9/32” holes, one for
each of the potentiometers, and five 13/64” holes, one for each of the toggle
switches. You’ll need to also drill a single 3/8” hole for the audio output jack.
Included in these directions are a sample drill template. If you print this PDF
at 1:1 scale, you should be able to use the sample drill template to locate the
holes for a front panel, and also use the template as an overlay for your panel if
you so choose. Two versions of the template are provided; one does not have
the Grit switch, in case you chose not to implement this feature.
Page 15
200 School St
Pittsburgh, PA 15220-2718
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