So I am building my second Aion Refractor Klon Clone and this one, for some reason has a high pitched squeal when switched on. To me this seems like some AC getting in through the charge pump (IC3). I tried to change the chip, but it squealed the same, so I dont think it is the chip itself. Any ideas?
Here is the link to the schematic (no mods) https://www.dropbox.com/s/4xhwadzx2rxbm8z/aion-refractor-centaur-documentation-v2.pdf?dl=1
and I have attached a pic of the board.
(https://s7.postimg.cc/s3o1579c7/IMG_20180521_182350.jpg) (https://postimg.cc/image/s3o1579c7/)
Have you checked the voltages on pin 1 and pin 8 of the charge pump? Should be the same... around +9v.
+9v on pin 8 but -4.5v on pin 1
Well, something's wrong. Are you sure pin 1 is seated in the socket? Otherwise, look for bad soldering on that socket pin or a break in the circuit board, etc.