Dual VCA with Sample/Hold and Random

Grumble

For this module there are three major components needed (if you consider an Arduino a component Rolling Eyes

)
First the Arduino, second a split power supply (dual 5 volt to produce VCC and VEE) and an AD5263 from Analog Devices and a handfull resistors and capacitors for protection and power supply smoothing.
The AD5263 is the most easiest to program: just write a 16 bit word to the device (using SPI, I2C is also possible but harder to do), in the first 8 bits you point to the potmeter you want to write to, and the next 8 bits gives the position of the slider.
I have used digital controlled potmeters before (HERE) but the devices I used were not capable of working between plus and minus 5 volt and that made the module more complicated as I had foreseen, but the devices I used now have a voltage span of 10 V to 15 V single supply or ±5 V dual supply.
The module has three different segments: two Voltage Controlled Attenuators, a Sample/Hold that holds at the rising edge of the CV input and a Random Voltage Output.
The Random Voltage Output randomizes at the rising edge of the CV input, and the bounderies of the random voltage are set with two potentiometers, one sets the maximum voltage, while the other sets the minimum voltage, which is dependent of the position of the MAX potmeter in such a way that the MIN voltage coming from this potmeter can never exceeds the voltage of the MAX potmeter.
HERE a Youtube flick I made.

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