I have a new LM723! Do you know RIZ, Radioindustrie Zagreb?
They have built the IL72723.
The ceramic package is shifted a bit.
Nice! Nothing special. But there is a failed bond.
You can see that the two parallel power transistors are somehow similar to the Tesla MAA723:
https://www.richis-lab.de/LM723_04.htmWell both are soviet parts.
More pictures here:
https://www.richis-lab.de/LM723_09.htmI also have updated the Fake ST LM723CN:
https://www.richis-lab.de/LM723_00.htmNothing special, I just updated the text.
I´m pretty sure that´s a soviet design because of the particular transistor design.
I also have updated the Fairchild MIL-723:
https://www.richis-lab.de/LM723_08.htmI was curious about the small difference to the "normal" Fairchild µA723 in the bottom right corner.
In the MIL-723 the Q6 and the D2 have their own collector area. In the µA723 they share the same collector area. D2 is a transistor working in breakdown as a zener reference.
Electrically that should make no difference but there could be a thermal effect. If Q6 gets hotter it conducts more current and so there is less current flowing through D2. Less current gives less voltage but with the higher temperature the zener voltage goes up. Perhaps both effects cancel themself at least partly. And of course better thermal coupling gives better compensation.