Hello ! I am trying to simulate a simple schematic but it takes too much time for the software to simulate it.
This is what I found on the output of the PSU (the green trace):


Any help will be appreciated !

 

hi mike,
Where did you get the LM723 model from.?

Try editing the Time step to 10uSec
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I got the LM723 model from the internet. Actually, I tried with 2 models for LM723, both found on the internet but the simulation took to much time in both cases.
I tried your suggestion but it also takes too much time to simulate the circuit...

 

Can you post a higher resolution picture of the schematic?
It's too blurry to resolve all the part connection names.

 

Please find attached the schematic.

 

Hello ! I am trying to simulate a simple schematic but it takes too much time for the software to simulate it.
This is what I found on the output of the PSU (the green trace):

Put "Ground" to circuit.

 

Your earth is missing.

 

Thank you a lot !

 

hi mike,
this is what I see.
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I see some oscillation on the 0.15R resistor (R6) when the R19 is 0.001 ohm.

 

Hi mike,
Who designed the circuit.?
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Also what is maximum Vout and Iout?

 

I found the circuit on the internet, on this website: https://www.eleccircuit.com/cheap-adjustable-0-30v-3a-laboratory-dc-power-supply/
Maximum Vout is 32V and maximum Iout is about 4A. I need 3A normally from this PSU. I made some minor modifications on the last simulation, which I included into the attached schematic.

 

Hi mike,
You have modified the circuit and added more TIP3055's.
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Hi mike,
This is the circuit as shown on that link.
It is unstable,
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Hi Mike,
Checkout this option.
You need a big heat sink for the 2N3055. [Green Plot]
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The reason for using that circuit is the possibility to use a higher voltage transformer for example a 33Vac transformer, which is over 40Vdc after rectifying and filtering.

 

The reason for using that circuit is the possibility to use a higher voltage transformer for example a 33Vac transformer, which is over 40Vdc after rectifying and filtering.

It will blow up at 40V in either circuit.

 

Yes, it is true, I need to add a zener diode or something that can limit the voltage...

 

hi mike,
Why do you need to use a 33Vac transformer.?
What is the maximum DC Vout that you require.?
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I need maximum 25V at output. I tried some time ago with a 24Vac transformer but when I set the output voltage at 25V and I connected a constant 3A load (like a resistor), then on the scope the output of the power supply was not a perfect horizontal line, it looked somehow strange (I deleted the screenshot with the scope screen from my pc)... the output which should be a horizontal line was a horizontal line in combination with the ripple on the filter capacitor.