I’m building the 4-pole filter for Shruthi.
I soldered everything and checked no shorts without ICs in, as explained in the build instructions. Then I put the LT1054 and checked voltages but they were wrong - first about -2V, later 0V where it should be -5V . Then I noticed I misplaced 7805 with 7905 and vice versa.
I have unsoldered 7805 & 7905 and replaced LT1054 with another one. Now, power on without the regulators, I can read -1.8V on LT1054 pin 5. I guess it should be about -9V (my power supply is 9V battery). Or is it normal without the 7905 connected?
The LT1054 is getting very hot after half a minute or so.
What could be wrong?
The connections seem to be fine.