| Electronics > Beginners |
| 10 Amps power supply with LM723 |
| << < (6/12) > >> |
| mike_mike:
I know that it works. But my circuit does not, and I am not capable of finding were is the problem... Probably I could find someone in my city for help. |
| iMo:
Be careful with grounds. There are 2 "grounds" - in my simulation the left hand side of the R_Shunt is COM and the right hand side is GND. I often connect the input filter capacitor to GND (wrong). Doublecheck how did you wire the stuff. When the simulation works it should in HW too.. Enclosed the simulation source - try it and compare it carefully with your kludge :) |
| mike_mike:
Thank you for your help. I will try to find the problem. Meanwhile, a quick question: does the attached schematic have current limit down to 0A ? |
| Wolfgang:
... in fact yes, but with low precision. The 723 is not very well suited to lab grade current limiting. An obvious problem here is the Vbe tempco of the pass transistors when running under high power. |
| mike_mike:
I finally managed to make the schematic from post #23 to work, but I found that the current limiting pot does not regulate linear the output current (I don't know how to explain exactly), so if I set the pot at half of its way, then the output current is about 0.5A, while the maximum current is 3A. The pot is a linear one, B500R. If the pot is at half, then the output current should be 1.5A ? Is that true ? |
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