Accessories for the DMX32
32 channel DMX dimmer "pack"
Here are two useful accessories for building large-scale, high power
installations with the DMX32. I recommend using either of
these or your own fuse arrangement in all installations, but strongly
recommend fuses for any installation over 15amps (180watts @ 12V,
360watts @ 24V) total power or any installation subject to
occasional uninstall/re-installation or weather.
ATTENTION: as of march 2016 I
can only sell to existing customers due to lack of time for
customer support. Thanks for your understanding.
Accessory #1: Per-channel fuse block ("FUSE-PERCHAN-32")
This wires a standard automotive mini-blade fuse in-line with every
channel on the DMX32. This protects the DMX32's NFET
transistors if there is a short circuit from miswiring or LED
Top view, mounted on a DMX32:
Closeup side view, mounted on a DMX32:
Features and notes:
Price: $45 per pair, including fuses of your specified rating
plus several spares, installed and tested on your
DMX32. As these are hand-made to order, there is no discount
- Every channel is fully protected from every conceivable
- Automotive fuses are normally rated to 32V. When
replacing fuses, ensure that their voltage rating is sufficient
for your installation - specifically: if you are using 24V,
double-check that any fuses you install are rated for 24V.
- Suggested fuse current rating: for per-channel current up to
3.5 amps (42 Watts @ 12V, 88 Watts @ 24V) use a 5 amp
fuse. For more than 3.5amps, use a 10 amp fuse.
Higher than 10 amp fuses are available but not recommended, as
they provide less protection and in some installation-dependent
instances may not blow in a fault condition. The DMX32's
dimming transistor is rated at 8 amps so a 10 amp fuse is ideal.
If you want to save some money, I am happy to provide the two pcbs
for free with each DMX32, and you can order and install the parts
yourself. The soldering is easy! You will need:
- Quantity 32 fuseholders: digikey.com BK-6013-ND or 3544-2K-ND,
or mouser.com 534-3544-2
- Quantity 32 fuses: digikey.com 5-amp: F989-ND, 10-amp F991-ND,
or mouser.com 5-amp 576-0297005.WXNV, 10-amp 576-0297010.WXNV,
or buy from ebay or local automotive parts store.
- Quantity 2 16-pin headers: digikey.com 277-1659-ND or
- Quantity 4 nylon standoffs: digikey.com 885K-ND or mouser.com
534-885. These are slightly taller than the 1/4" standoffs
provided with the DMX32, since the fuseblock pcb rides a little
above the DMX32 pcb.
Accessory #2: Fuse-protected power distribution block
This distributes current from the +V output on your power supply to
8 separate feeds to connect to LED strips. Each feed has its
own fuse. The pcb is 1.5" x 3.75" pcb with a 3-parallel-input
terminal block (30amps each input, 10-30 AWG wire), an 8-output
terminal block (20amps each output, 10-30 AWG wire), and 8 mini
automotive fuses protecting each output. 5 mounting holes for
#6 screws. 32V maximum, 20 amps per output maximum, total
maximum overall current 90 amps.
Price: $25 each, including fuses of your specified
rating (5, 10, 15, 20amp) plus some spares. Here are pics of
the prototype, the final design is in stock but website pics not
Mechanical drawing. Click for larger version:
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