Some build notes for the LUX module.
This is a Nonlinear Circuits Eurorack module.
It's just 2HP
Think optical thermin.
Four resistors, two photodiodes and a dual op amp.
The simplest NLC module, so far.
Links:
+ Wiki
+ BOM
The photodiodes pick up changes in the light and convert this into control voltages.
I think its a useful module to have ... we can always use extra CVs
Remember though .. the closer your hand is to the photodiode
the lower the output voltage.
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The photodiode i'm using is this one (recommended by Andrew F).
His notes:
"The 3rd ones I tried were 1540051EA3590 which
are my favorite so far, with a 1M resistor the output voltage sits at
about 8V in my shed at noon (I have a skylight), so it is easy to
play the module and get a 0-8V range."
Mouser No:710-1540051EA3590
Mfr. No:
1540051EA3590
Photo diodes consume light , converting it to a current.
Of course you can try different photodiodes.
Experiment :-)
There are actually two identical lux circuits on this module so you could
set up each differently to suit different conditions.
dRANO Hotshot -- injecting drano ??
Not recommended - :-(
I think this is a lyric from the band "The Cramps"
New kind of kick...
Schottky, power
rectifier or 10R,
optional - for reverse
voltage
protection...or not
I'll use 10R only because I have lots of them.
The photodiodes produce current when light falls on them. This is
fed to an op amp which spits out a voltage that reflects the light
intensity.
The design is really supposed to be an ambience and movement
sensor to reflect changing light conditions (if you were playing
outdoors for example) and it responds to your movements as you move
around tweaking and patching.
I'm started using 1M resistors with the photodiode.
This put out very low voltages .... approx 1V.
...........hardly noticable
Then tested with 10M resistors ...the module put out voltages between 5V and 8V
...... much better .... though maybe a touch too high for euro ???
This is the basic circuit
I think its worth experimenting.
At the moment, I'm only experimenting with the feedback (10M) resistor.
The (1k) output resistor may also be worth fiddling with.
next ... 4.7M resistors ... --- between 4 & 5 volts
... I would refer a bigger range
I'm in fairly well lit room.
This may be very different in a dark room
6.8M
range 6.7 and 4.4V
3.3M
I'll stay with 3.3M for the moment.
In a fully lit room the output is about 4.5V
maybe different in a dark room
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You can find more NLC builds here.
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