THD Meter R. Cordell

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Hi all, I'd build the THD METER of Robert Cordell that, from what he writes, has best performance. I find some difficulty to understanding how to wire the switches, but I will get there slowly. Some of you have built it, and if yes has found errors on the schematic and/or explanations?
Of course, the recommendations are welcome!
Thanks and regards
Giuliano
 
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