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Well, here I am again, with the big question: How does the computer talk to the slaves (Arduino Megas. I have gone through USB (major problems), NASA Edin Lite via RS485 (but it has a small packet size). Then I thought of Ethernet (too costly per node) and then I thought of CAN bus, it has an 8-Bit payload, and in some respects it is extensible it is used in automotive, machine tools, and aircraft. Enter CANaerospace (Open Source) has been codified by ARINC 825, both Airbus and Boeing have adop ...
All is now well most of my noise was coming from two sources. Power bridge needed resoldering! Scope probe not grounded! It is now all buttoned up and on the shelf! Here are some pictures. Test Setup Sine Wave Square Wave Triangle Wave ...
THEN NOW Well, I have this unit on the repair shelf for a since 2015/07/22 So after much sawing and filing I got the NEMA socket to fit in the damn hole. In hindsight, I am glad I used the spade lugs! I then use a Molex type plug set with some wire on it so that I can work on the unit while the back is off. I also replaced the 600ohm solid wire with stranded wires as well. The 50ohm  cable is not grounded at the circuit board but only at the connector, to reduce ground loops   Goo ...
THEN NOW   Black (Hot) and White (Neutral) ended up switched so 110 VAC ended up on my ground-plane! Push on connectors are a must! I replaced the bridge with 4 100vdc 5 amp monsters.  It took quite a bit of heat to solder the big leads so I sub in an IR bridge  12DB6A I have a lot of harmonics to fix. The function generator parts still work. that is to say triangle, sine and square wave are ok just with harmonics. Most likely killed some caps!   PROBLEM DEAD DIODES ...