BaffleChallenged Posted November 27, 2018 Share Posted November 27, 2018 Hi everyone, I did build a very simple but effective audio interface to use with the Analog discovery. Elsewhere on this forum I already published scripts to measure thd vs frequency and how I wired my dummy load. If it is of interest to you, you can have a few board manufactured and populate them for a reasonable amount of money. Each scope section can be set to an attenuation factor of 1, 1.5 or 2 so that output of up to 100Vpp can be measured. Scope 1 can be jumpered to output 1 to facilitate network analyser measurement. Scope 1 can be jumpered for input impedance measurement. scope 2 has the same 3 attenuation factors and the connection to output 1 wavegen1 can be jumpered to the output directly, via a 680 ohm res for IMD or a 100k res for input impedance. wavegen2 can be jumpered to output 2 or a 680 ohm resistor to output 1 I hope this is clear enough to get you going. note that the schematic has RCA output jack, but they are not in the gerber files. Regards, TopSilk.gbr BoardOutline.gbr Bottom.gbr BottomMask.gbr Through.drl Top.gbr TopMask.gbr AudioInterface.pdf Link to comment Share on other sites More sharing options...
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