Module A-118 is (as you might have guessed) a noise and random voltage generator. It produces three types of signal: white noise, colored noise, and random voltage. The noise signal is generated 100% analog by amplification of the noise of a transistor. White and colored noise can be used as audio sources, and also, in conjunction with a sample & hold module, as control voltages, and the random voltage is a useful source of voltage control, especially for its low frequency content.
The A-118 gives you the ability to mix the relative amounts of Red (low frequency component) and Blue noise (high frequency component) in the colored noise output.
There are knobs to control the rate of change and amplitude of the random voltage, and two LEDs indicate the state of the voltage at any one time.
For more detailed information please look at the English user’s manual A118_man.pdf.
Important note: After power on it takes a few minutes until the two noise signals and the random signals are generated. The module is not faulty when after power on the signals do not appear immediately !
A-117 Digital Noise Generator
A-149-1 Quantized/Stored Random Voltages
Width: 8HP / 40.3 mm
Depth: 40 mm (measured from the rear side of the front panel)
Current: +20mA (+12V) / -10mA (-12V)