Advertisement
Quick Links
Equal Power Stereo Mixer
R*S Stereo Mixer
Equal Power Stereo-Mixer
The Random*Source
4 high-end THAT2180 blackmer VCAs, designed to emulate the behavior of Serge VCAs. Version 1.2 offers a
number of unique features:
1.
New Serge VCA emulation - using trimmers on the panel pcb, you can set the VCA behavior (i.e.
the treatment of gain CV) to purely exponential (like on previous versions of the Stereo Mixer) or
„Serge-esque" - compressing the peaks and providing more „body" - or anything in between(!).
2.
Balanced Outputs, using „a new generation of monolithic audio differential line drivers offering im-
proved performance over conventional crosscoupled designs" for low noise and distortion. These
outputs can be connected to balanced or unbalanced equipment (amplifiers, A/D converters...)
3.
Burr-Brown op-amps in the audio path.
4.
Great distortion and soundshaping capabilities - try CV at audio rates and play with Gain.
The Stereo Mixer is an improved version of comprises 2 pcbs, a main pcb and a component pcb - To build the
board,
only install the through-hole parts shown green here
Update: If the resistor marked above is 24k (marked 2402), please read the notes on panning below!
Please read the build instructions below before commencing the build. The module is designed to be used with
a +12V / -12V power supply. Any values given here assume such a supply.
RANDOM*SOURCE
is a voltage controlled stereo mixer / panner / VCA based on
and omit / ignore any others:
RANDOMSOURCE.NET
V1.2
Check value
Check value
> <
> <
=2402 ?
=2402 ?
1
Advertisement
Related Manuals for Random*Source R-S Stereo Mixer V1.2
Summary of Contents for Random*Source R-S Stereo Mixer V1.2
- Page 1 R*S Stereo Mixer V1.2 Equal Power Stereo-Mixer The Random*Source is a voltage controlled stereo mixer / panner / VCA based on 4 high-end THAT2180 blackmer VCAs, designed to emulate the behavior of Serge VCAs. Version 1.2 offers a number of unique features: New Serge VCA emulation - using trimmers on the panel pcb, you can set the VCA behavior (i.e.
- Page 2 RANDOM*SOURCE Equal Power Stereo Mixer Bill of Materials (Equal Power Stereo-Mixer 1.2) Variable Resistors 2 50k T1, T2 Precision Trimmer - 5k T3, T4 * DO NOT INSTALL * 1 100k TC on COMPONENT PCB Trimpot - side adjust recom-...
- Page 3 RANDOM*SOURCE Equal Power Stereo Mixer General Build Recommendations • Use DIP16 sockets can be used for the 4 THAT2180 ICs - precision ones (milled) recommended. • Use upright / side-adjust trimmers on the panel pcb if possible - that saves you from having to remove the main pcb to adjust the trimmers.
-
Page 4: Setup / Calibration
RANDOM*SOURCE Equal Power Stereo Mixer Options Lowpass filtering of CV: C1 and C2 can be used to form a low pass filter for the Pan CV, C9 and C10 work similarly for the Gain CV. This leads to higher frequency CV being rounded / flatted, avoiding plops caused by abrupt voltage changes. - Page 5 RANDOM*SOURCE Equal Power Stereo Mixer Equal Power Panning: The panning circuitry is quite sensitive to voltage levels. You may want to check that your power supply is actu- ally calibrated to +/-12.0V before you start. You also need a scope and a (symmetrical) triangular control voltage (LFO) going from 0V to (exactly) 5V. It’s a good idea to check the actual voltage - a (properly calibrated) Serge Dual Slope Generator works fine, the triangle output of a Serge PCO, however, does only go up about +4V and is therefore not suited.
Need help?
Do you have a question about the R-S Stereo Mixer V1.2 and is the answer not in the manual?
Questions and answers