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Serge SSG
SERGE
Smooth & Stepped
Generator (SSG)
The Serge Smooth & Stepped Generator (SSG) is an essential part of the Serge system. According to the 1979
catalogue, "it is a complex multi-functional module which can be patch programmed to provide various slew
and sample functions.
The Coupler is an internal comparator which compares the output levels of the Smooth and the Stepped Gen-
erators. This output is useful for generating complex control voltages or random voltages.
The Random*Source version of the Smooth & Stepped Generator is a licensed and authorized adaption of the
original Serge design that provides an increased audio range of the Smooth Generator and a bipolar ("hot") Cou-
pler output in addition to the regular (unipolar) Coupler output.
The Random*Source SSG + Random Source (RS) 4x4 kit consists of a front panel, a component pcb serving as
an interface to the front panel as well as two main pcbs (one for the SSG, one for the RS), each of which already
contains most of the parts in surface-mount technology (SMT). This document only describes the SSG side.
RANDOM*SOURCE
The Smooth section will place a postitve and
negative slew on input voltage transitions for lag
effects, voltage controlled portamento and for
low frequency filter applications." In Cycle-mode
(cycle jack patched to the input), the Smooth
side "will oscillate yielding a voltage controlled
traiangle wave LFO. A high level into the HOLD
input will enable the Smooth Function to be used
as a track-and-hold circuit with voltage controlled
slew rate.
The Stepped funtion can be used as a sample-
and-hold with voltage controlled slew rate
limiting. In Cycle mode, a pulse applied to the
Sample input will generate complex staircase
waveforms for control voltage applications and
for use as audio signals.
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Summary of Contents for Random*Source SERGE SSG
- Page 1 (unipolar) Coupler output. The Random*Source SSG + Random Source (RS) 4x4 kit consists of a front panel, a component pcb serving as an interface to the front panel as well as two main pcbs (one for the SSG, one for the RS), each of which already contains most of the parts in surface-mount technology (SMT).
- Page 2 RS requires the fully installed pcb (i.e. also the lower area containing the Serge Noise Source and Sample&Hold). Please note: The Random*Source SSG pcb is available in different configurations - for the “normal” SSG, • the pcb version that only contains the upper parts is sufficient (i.e. not the ones greyed- out in the picture above).
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Page 3: Bill Of Materials
RANDOM*SOURCE Serge SSG Bill of Materials Trimmers 2 100k Rate Stepped, Trimpot (Bourns 3362P, Vishay T73YP104KT20 or anything Rate Smooth that matches the footprint). See calibration info below. 2 2K or more LED brightness (instead of Trimpot (Bourns 3362P or Vishay T73YP202KT20 or any-... - Page 4 RANDOM*SOURCE Serge SSG 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 retention rings for the LED lenses, attach the ring to the lens. Mount the pots onto the component pcb. Pots should sit on the side marked on the pcb - this side faces the front panel. Don‘t solder them in yet. Stick the LEDs into the component pcb - the long leg must be at the + side. Carefully mount component pcb (with the pots and LEDs inserted) onto the front panel. First slide / push the LEDs 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 LEDs sitting inside (and not on top) of the LED lenses, solder the LEDs 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. Main pcb and component pcb are to be connected through precision DIP socket and pins. It is recommended to use the pins on the main pcb (facing down, soldered from above) and the pin sockets on the component pcb (standing up, soldered from the front panel side). Break or cut off the pieces you need and stick them together so that main pcb and component pcb form a nice sandwich (don‘t solder yet). Check that you didn‘t leave out any pins / holes and that the sockets are all on the same side (component pcb). Solder all the pins in while keeping the sandwich together - this avoids any misalignments. Carefully separate the sandwich - if you used precision sockets, this may not to too easy - they stick together nicely (giving a good connection).
- Page 5 RANDOM*SOURCE Serge SSG 10. Solder the banana jacks in. You can either solder them directly to the surrounding vias (ring round) or - which makes removing easier should you ever need to do that - by inserting a stiff (bare) wire into the little hole (via) and solder that wire to the top of the banana jack: 11. Attach any screws / spacers if desired and mount the main pcb onto the component pcb. 12. Connect a power cord supplying +12V, GND, GND, -12V to the MTA-header on the main board and you should be ready to go :-) Calibration There’s one trimmer for each side that - among other things - determins the range covered by the RATE potenti- ometers. The most efficient way for the Smooth Generator seems to be: Turn on Cycle mode by patching CYCLE into IN and turn up the RATE pot to maximum.
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Page 6: First Steps
Using the VC input jack in the same setup as before, this filter effect can be used to achieve the effect of a Lowpass Gate / VCA. Send an CV envelope (e.g. from a DUSG or an Extended ADSR module) into the VC jack and turn the VC knob sufficiently high. Tune the Rate pot to a position so that the output is silent when no CV is applied but clearly audible when the envelope is high. This causes a VCA effect, but the envelope not only determines the amplitude, but also the amount of filtering applied (like a lowpass gate). Power Consumption Power consumption: <=30mA @ +12V and <=30mA @ -12V (Version 23 December 2015) SERGE Modular by Random*Source. Module and circuit under license from Serge Tcherepnin. All rights reserved. RANDOMSOURCE.NET...
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