Eric:
I think I understand this. BTW, I could not view the attached pdf, but could see the image. Are they the same? For the 5 v coming out of the phidget, I use 2 capacitors to smooth out the voltage (I assume). The + output from that goes to pin 7 on the OPA350. The positive output from the PV controller goes to pin 3. Does pin 2 go to ground which also goes to the negative output from the PV controller? Does pin 4 also go to ground (PV neg output)? Pin 6 is where I measure my output voltage (relative to ground)? Does R3 mean 4,700 ohm (4k7)? I assume R4 was initially a 58 ohm resistor, but you are suggesting a 100k pot. I am further assuming this will allow me some adjustment of Vout. Is all this correct? If I have this somewhat correct, I believe I can build this. Let me know how I am doing. Are 8 pin DIP sockets a standard size? I figure I should solder a socket and not the chip, given my skill level.
Thanks again for all your help and being so patient with me!!!
Doug