..... and the sockets aren't fitted the wrong way round if you are relying on their pin 1 marking (a common problem with single sided and home etched boards that don't have any topside pin 1 indicators)!
That's why I always edit my boards from the component side in the EDA, I'm familiar with it the way it goes, I've seen too many errors because of being familiar to see the board from the back. Even easier because I don't have to mirror the PCB image to do the transfer, as I worked it all the way mirrored... I know the standard way is the other way but I just can get it, it's much more prone to confusion!
Yes....sorry TL072
Replacing the TI opamps is no big deal. Was more concerned about the russian IC's and transistors on the board..since those are relatively difficult to source.
It's based off an early 80's design..I haven't seen any data sheets so I don't know the pinouts.
Well, that's why one uses a current limited power supply to bring up a new board, with the current limit set to a low value. If it goes into current limit/constant current because it is drawing more than reasonable amount of juice (where reasonable depends on what is on the board) or things are starting to get hot, cut the power and check!
This will save you a lot of magic smoke. Everyone makes mistakes but the key is to anticipate that something could be wrong and prevent mistakes from turning into disasters.
That takes the fun of the first power on away! Today someone brought the simulator as a tool to avoid breathing magic smoke and I said that you learn so much more when a cap explodes over your face than when the PC shows you a red flag... When playing with TL072 they well worth blowing, just a few pennies and you will remember to pay more attention next time, for the time you are playing with $20+ chips you already learned the lesson and you also have the tools for when your brain farts.
From my point of view, well done Rob, I don't need to tell you pay more attention next time! Few cents for that chip are well worth the lesson!
JS