ULX3S SDR with ALINX AD/DA

Last year, I wrote about the ALINX AD/DA Module that I found on fleabay. Anyone interested in this board should certainly watch the video posted by opentechlab.

Key tidbits of information from the video:

• DAC is powered by onboard 3.3V regulator.

• Output from the DAC is differential 3vpp; (true output is difference) each output goes though a low pass filter for anti-aliasing. 

• Fed into AD 8056 op-amp to convert differential signal to single-ended and level shift from 3vpp to 10vpp (-5 to +5V)

• Potentiometer is used to control gain of output.

• There's a bit of input protection on the ADC.

• Input filter converts 10vpp to 3vpp for ADC chip.

• MC34063 Step-Up/Down/Inverting Switching Regulators to generate negative rail for output from single +5VDC supply.

Links:

• https://opentechlab.org.uk/videos:014:notes