RANDOM*SOURCE
1
Serge DUSG
SERGE Dual Universal
Slope Generator (DSG)
The Serge Dual Universal Slope Generator consists of a main pcb that already contains most of the parts in
surface-mount technology (SMT) and a component pcb serving as an interface to the front panel.
Main pcb:
Please note:
•
The Random*Source version features
independent VC control over RISE and FALL
,
super-matched THAT transistor arrays
and
Burr-Brown op-amps
.
Also: adjustable BIPOLAR symmetry and LED brightness.
•
Orientation of the main pcb:
power header is at the bottom
(when looking at the module up-
right, e.g. in a rack).
•
Use antistatic precaution when handling the DSG pcb - don’t touch the small SMD parts and ICs
with your hands.
•
Only these parts have to be soldered in: trimpots, polystyrene timing caps, jumpers, pin stripes to
connect the main pcb to the component pcb, MTA power header (see picture above).
•
LED: The trimpots (“LED”/20k) (together with an on-board resistor of 1k) determine the bright-
ness of the LED. It is
essential to use low current (max 2mA) LED
s -
otherwise the LED
action might affect the operation of the module
(depending on brightness and color). Use
at least 100-130mcd or ultrabright LEDs (60°) plus a
trimpot of (only) 2k for (fairly) bright
LEDs (
100-150mcd). If you use ultra-bright LEDs, a 5k trimmer might make sense, higher val-
ues for the trimpot are probably not needed (but work also). When using a
red
LED, make sure
the trimpot is set to at least (another) 1k (which adds up to a total of 2k with the 1k resistor on
board), when using blue or white this is less relevant.
