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| 10 Amps power supply with LM723 |
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| iMo:
You wired the C9 10u capacitor at wrong place. Look at my schematics above. Try with R1=12k, R2=10k pot, R3=0 and with the divider by 10 at the output. Wire C5=10u from the bottom of R1 against gnd of 723. |
| mike_mike:
I tested the attached schematic but it goes only from about 7V to about 30V. The voltage on pin 5 is 0V and on pin 4 is 0.74V, while on the output is about 7V. |
| mike_mike:
I also tested with 4k7 and 3k9 resistor for R12. The value for R1 was 1k2. The output voltages were: with 3k9: from 3.7V to 29.8V, but when the output voltage was 3.7V, and if I started to rotate the pot, the voltage started to rise only when the pot was at 1/4 of the course. |
| mike_mike:
I tested with the following values, and the output voltage varied from 3.1V to 25.9V. The maximum that I need is 25V, so 25.9V is OK. The lowest output voltage is also OK. R1=1.2K, R2=10K pot, R3=680R, R12=6K8 and R10=2K2. There is a problem that still persists, the 10K pot has a "dead" portion on the low voltage. When the output voltage is abut 3.1V, the voltage starts to rise only when the pot is at about 1/4 of its course. |
| mike_mike:
I try to make a simulation of the attached schematic in LTSpice, but the program does not show the .raw file when I run the simulation. At the beginning I set to DC op pnt, but after I run the simulation, I set it to transient. Can you please tell me where I am wrong ? |
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