Controlled Crossfader / Triangle-to-Sine Waveshaper
is the combination of two functions and planned primarily as an expansion module
for VCOs or LFOs (e.g. A-110-1, A-110-2,
upper section is a very precise triangle-to-sine converter (thank's to Tim Stinchcombe
who recommended this circuit). It can be used to
convert any triangle waveform into a (nearly) perfect sine. The converter is
much better than the simple diode converter used in the A-110-1, A-111-1, A-145
and A-147-2. Two trimming potentiometers are used to optimize the sine shape.
The converter should be assigned to one VCO or LFO because the trimming
potentiometers have to be re-adjusted if the input level or DC offset of the
input signal changes. If the trimming potentiometers are deliberately
mis-adjusted it can be used also as a waveshaper for non-sine waveforms (e.g.
sine-shaped at the top of the signal and a peak at the bottom, even voltage
controlled by applying an additional voltage to the waveshaping circuit,
"circuit-bending" notes will be available).
Voltage Controlled Crossfader
lower section is a voltage controlled crossfader. It has two inputs A and B. The
two signals are mixed together with variable percentage. When the manual control
CF is fully CCW only signal A appears at the CF Out socket. When the manual
control CF is fully CW only signal B appears at the CF Out socket. In the center
position of the manual control both signal appear with the same level. In
addition a control voltage input CV with attenuator is available to enable
voltage control of the crossfade.
The sockets of the upper section (triangle and sine) are normalled to the inputs A and B of the crossfader section. That way the crossfader is used to fade between triangle and sine of the VCO or LFO connected to the waveshaper. If other signals are plugged into the input sockets A and B these signals are used for crossfading.
The main application is to fade between two different waveforms of a VCO or LFO or two different VCF outputs. But the module can be used for any other signals too as the waveshaper and crossfader sections are independent apart from the normalled sockets.
The following document shows the positions and functions of the trimming potentiometers of the module: A184_2_trimming_potentiometers.pdf. "DC OFFSET" is used to adjust the DC offset so that the sine signal is symmetrical with reference to GND. "SINE SHAPE" used to adjust the output waveform to a (nearly) perfect sine. Both trimming potentiometers can be misadjusted deliberately to obtain other waveforms.
4 TE / 4 HP / 20.0 mm
Tiefe/Depth: 35 mm (gemessen ab der Rückseite der Frontplatte / measured from the rear side of the front panel)
Strombedarf/Current: +30mA (+12V) / -30mA (-12V)
/ Price: Euro 90.00
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