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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)
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.
RANDOM*SOURCE
RANDOMSOURCE.NET
LEDs - otherwise the LED
1
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Summary of Contents for Random*Source SERGE DUSG
- Page 1 (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).
-
Page 2: Bill Of Materials
RANDOM*SOURCE Serge DUSG Bill of Materials Trimmers 4 100k T1, T5 (Offset) Trimpot (Bourns 3362P, Vishay T73YP104KT20 or T4, T8 (bi-polar output) anything that matches the footprint) to adjust the uni- polar output and the symmetry of the bi-polar output. - Page 3 RANDOM*SOURCE Serge DUSG Building This is simply a suggestion - you might find a different workflow more practical: Mount the Banana jacks, the LED lens and the switch onto the front panel. If you use a retention ring for the LED lens, attach the ring to the lens. Mount the pots onto the component pcb. Pots should sit on the printed side - this side faces the front panel. Don‘t solder them in yet. Stick the LED into the component pcb - the long leg must be at the + side. Carefully mount component pcb (with the pots and LED inserted) onto the front panel. First slide / push the LED into the LED lens - all the way, this may take a bit of force. You may then have to wiggle each pot a bit to get the pots through. Make sure the threads of the pots go through com- pletely and the pots sit right at the front panel. You can even screw the pots to the panel to make sure of that, but you have to unscrew them again later (for Step 5). Once everything is nicely in place, especially the LED sitting inside (and not on top) of the LED lens, solder the LED and the pots onto the component pcb (while the front panel is attached). DO NOT SOLDER THE BANANA JACKS YET! Solder the through-hole parts onto the main board. For the 3“ DUSG module, connect Jumpers 1 and 3 on each side (see picture on page 1) - for a 2“ DTG module, a different...
- Page 4 Using T2, T6 the 1V/Oct tracking can be adjusted. However, be aware that by design the tracking of this module is not very good compared to dedicated oscillators. (Version 2 June 2015) SERGE Modular by Random*Source. Module and circuit under license from Serge Tcherepnin. All rights reserved. RANDOMSOURCE.NET...
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