Okay - after 1 damaged Zener and 2 damaged power transistors my power supply is now finished.
- I used the MC34072 oamps with max.44V instead of the MC34071. With the MC34072 I was not able to do the offset compensation. So the current limiting became a problem. ( When I turned the current limiting to minimum, it stopped limiting the current and damaged the power transistors with 24A output
). So I used a 68Ohm resistor for R17 and all worked perfectly.
- I used a 2x30V - 230VA Transformer with 32.47VAC without load. The problem is the voltage without load of about 45.91VDC - too much for the oamp. So I decided to use D15 in my shematics.
In practice, the max voltage is about 44.1V so it will also work without D15.
Here are pictures of my working Power Supply, my shematics with the (hopefully...) correctly bill of materials for my shematics.
I decided to give you my bill of materials because there are a view mistakes and missing parts in the existing list.
Sorry for my bad english - hope everyone can understand me
PS: More pictures in my next replyUpdate: After a view tests at maximum output (30V 3A) I saw that D15 (10V Zener) in my schematic only allows an max output of about 24V at 3A. Or about 2.7A at 30V...
So I decided to throw D15 away and replaced it with a peace of wire. Now I am able to get 30V with 3A.
If someone has the same problem as I (The rectifier voltage is to high for the oamps with 44V) you can use D15 which should have only as much voltage as you need to get under the 44V. The voltage in my circuit is about 39.6V - 44V and nothing is damaged.