Switched Capacitor Filter using Arduino Nano, AD9833 en MAX261

This is PUSCAF II (Programmable Universal Switched Capacitor Filter).
The filter used is a MAX261 and is clocked using an Analog Devices AD9833 Programmable Waveform Generator.
The Control Voltages are measured with an Arduino Nano, which also sets the registers for the AD9833 and MAX261.
The MAX261 is a dual 12dB/oct universal filter, the first part is programmed to act as a lowpass filter, the second (the output stage) is used as a lowpass filter and bandpass filter.

[@martingerken7094]

What an interesting chip. Could you share the schematics? Where didyou get it from? Cannot find it at conrad, Reichelt or Segor...

[@DutchBigEd]

I got them years ago as samples.
www.modwiggler.com/forum/viewtopic.php?t=248810#p3725357 here is the first iteration of this project, a dual switched capacitor filter.

[@martingerken7094]

@@DutchBigEd thanks for the helpful link