Electronics > Beginners
10 Amps power supply with LM723
iMo:
GND is missing in your schematics.
mike_mike:
Thank you. Now the simulation works.
Regarding the previous posts, are the results good ? Are there any problems ? I mentioned that the voltage pot has a "dead" portion, can it be solved ? It is not such a big problem, if the power supply works correctly...
iMo:
It is many decades I messed with 723 PSUs. Afaik the minimum output voltage is 2V with 723.
Wolfgang:
Correct. Below that the 723 inernal error amp does not work properly anymore. Below the emitters there is a current source, and its collector voltage is the error amp input voltage minus Vbe, so when you have 2V at the inputs, its about 1.4V Thats already not too much, so below that the current source is simply not working with a good and high output resistance.
mike_mike:
Hello,
I have found the attached power supply schematic.
Can you please help me with part numbers for replacement transistors TR3-TR6 (A823) and TR2 (3223) ?
The replacement transistors are not really necessary to be pin to pin compatible, because I can redesign the pcb layout.
I would also like to know the voltage for ZD3, the part number for D4 (1N4148 ?) and the secondary voltage of the transformer.
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