Ordinary opamps have a max supply voltage of 36V.
The MC34071, TLE2141 and a few others have a max supply voltage of 44V.
The OPA445AP has a max supply voltage of 90V.
An amplified 5.6V zener diode is buffered by the opamp so it is very stable.
Here is the reference voltage from a power supply project on another website:
The MC34071, TLE2141 and a few others have a max supply voltage of 44V.
The OPA445AP has a max supply voltage of 90V.
An amplified 5.6V zener diode is buffered by the opamp so it is very stable.
Here is the reference voltage from a power supply project on another website: