The DMX Files
Information, accessories and repairs for the
Oberheim DMX Drum Machine
Latest update: 2008-07-08
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News
New! Magnetic RAM
upgrade
for Oberheim Z-80 based products (DMX, DX, OB-8, OB-Xa, OB-X, DSX).
The circuit boards are in, and the DMX version is tested and working correctly!
This upgrade replaces the battery RAM with a new magnetic RAM technology -- no more battery replacements, no more battery
leakage, no more memory loss due to dead batteries. A small circuit board plugs into the Z-80 socket and the Z-80 is
moved to the Magnetic RAM board. The old RAM ICs and battery are removed. That's it! No soldering required.
This board will work with all versions of the DMX, including the MIDI version.
The MRAM board has been successfully tested on three versions of the DMX.
Testing for the DX, OB-Xa and OB-8 will commence shortly. If you have a
Z-80 based
Oberheim product that has not yet been tested, you may qualify to buy
an MRAM board at a discount if you are willing to be a beta tester. This
entails installing the MRAM board and reporting the results. Drop me an
e-mail
if you're interested.
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| Sequential Circuit Drumtraks EPROM images now available here.
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| New samples on the DMX EPROM image page:
Electric Kick, Electric Snare 3, Long Hi Hat, Long Noise and Scratch.
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| Visit the new Friends of Electrongate
page! If any of my customers or other friends would like to be added to
the list, just drop me an email.
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| Due to the battery price increase, the cost for a DMX tuneup is
going up to $89.
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| Batteries! We now have replacement lithium
batteries with solder pins as used
in the Oberheim DX, OB-X, OB-Xa and OB-8.
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| Due to a price increase from my supplier, the cost of replacement
DMX/DSX batteries has gone up.
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| Check out the new product page -- you
can use PayPal
to buy cool DMX accessories! Click the link at the top of the page.
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New Electrongate products, now in production --
photos
coming
soon:
- DMX Trigger Box DTB-8 -- A rack-mount interface that allows
playing
the DMX with external trigger pads such as those made by Roland or
Simmons (not included). The DTB-8 features eight 1/4
inch input
jacks on the front panel, each with an LED trigger indicator.
A custom cable connects from the rear panel to the Molex
trigger connector
on your DMX. Trigger sensitivity is adjustable by means of
a trim pot for each individual channel.
Powered by an internal 120/240V AC power supply. $249
- DMX Trigger Box DTB-10 -- like the DTB-8, but with the addition
of
two multi-trigger inputs that allow triggering any combination of drums
with a single trigger pad. The combinations are set by DIP switches.
$279
- UniTrigger UT-1 -- A simple MIDI trigger box that accepts a
single
voltage
or variable resistance trigger input and produces MIDI note-on/note-off
output.
A multi-turn pot sets the base MIDI note number, and a 0 to +5 volt
control voltage (CV) input allows
setting the MIDI pitch at 1 volt per octave. Features LED
power and trigger
indicators and a pitch select knob on the front panel. The rear panel has
a DC input jack, MIDI In and MIDI Out jacks, 1/4 inch CV and Trigger Input
jacks. $129
- Click Box CB-1 -- Give your drummer a click track to
keep time with
your MIDI sequences. The CB-1 is like a synthesizer with only one sound
-- any MIDI note-on received on the selected MIDI channel produces a
click. The tone of the click is determined by the note-on velocity, so
you can emphasize the down beat. Just add a track to your MIDI sequence
with a note every quarter note and assign it to the CB-1 MIDI channel.
Direct output to headphones is through a 1/4 inch stereo jack, or send the
output to a mixer or amp for more volume. An analog volume control sets
the level. An LED on the front panel blinks with each click, and the
rear panel features MIDI In, MIDI Thru, DC power in and the headphone
output jack. $99
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| THUMBSCREWS! We now have a supply of those cool
thumbscrews
for the front cover of your DMX or DX. These make it easy to open your
drum machine to change EPROMs or voice cards without using any tools. A
set of two thumbscrews
is available for $5.00, including postage to anywhere in the USA.
Click here to order.
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| KNOBS! We now have replacement volume slider knobs for the DMX available. These are exact
replacements, newly manufactured by Rogan, the company that made the original knobs for Oberheim. The same knobs are also
used on the Oberheim DX (and Stretch).
Click here to order.
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| Added link to panel cutout diagram for end panel modification on the DMX MIDI installation instruction page
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| Just added: Oberheim DX schematics and part layout drawings here.
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Technical information for the Oberheim DMX drum machine
This information is provided as a public service by
Electrongate.
DMX Resources
Do-It-Yourself Resources
Disclaimer:
These documents are primarily intended to provide guidance for those wishing to modify
Oberheim DMX voice cards. A basic knowledge of electronics, circuit board assembly procedures,
parts handling and soldering is assumed.
If the reader is not comfortable making any of these changes personally, a competent electronic
technician should be consulted.
These documents are believed to be correct to the best of our knowledge,
but Electrongate
will not be responsible for any damages or injury caused by information provided herein. The
reader should proceed with due caution, and any modifications are made at the reader's own risk.
Related Links
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