You can use LTspice. I added to my collection mc34071, mc34072, mc34074.
https://forum.allaboutcircuits.com/...nents-models-of-ltspice-free-download.133690/

The MC34071 is not made in a through holes DIP package anymore, just in a tiny surface mount package now. The dual and quad are available in the DIP package.
The TI TLE2141 (and dual and quad) are almost the same and are available in the DIP package.

 

The MC34071 is not made in a through holes DIP package anymore, just in a tiny surface mount package now. The dual and quad are available in the DIP package.
The TI TLE2141 (and dual and quad) are almost the same and are available in the DIP package.

So should I go with TLE2141? will it give desired output without any alterations?

 

Yea

hi rahul,
Rerun those TP tests when you have the correct components in the circuit.
If you have to use alternatives post a marked up circuit diagram.
E

Yes sure... Within 2 days.

 

hi rahul,
This is your circuit in LTSpice, it works reasonably well, could be improved.
Shows Vset pot being step changed, versus Vout.
The Over current LED, TP6 drive works OK at current limiting.
LTS 'asc' file attached if anyone else wants to run it.[E&O]
E

Thanks for this simulation.

 

Btw today i made a 28VAC transformer by myself.

 

I do not know who made the schematic and parts list you have. The circuit I improved uses TWO output transistors with emitter resistors.
I did not look at all the parts on your schematic but I notice that R10 is needed for a TLE2141 opamp for U2.
The transformer must be rated for 4.2A then the output can be 30V at 3A. The extra current is needed since some parts use power for heating.
Here are the latest schematic and parts list I made:

 

I do not know who made the schematic and parts list you have. The circuit I improved uses TWO output transistors with emitter resistors.
I did not look at all the parts on your schematic but I notice that R10 is needed for a TLE2141 opamp for U2.
The transformer must be rated for 4.2A then the output can be 30V at 3A. The extra current is needed since some parts use power for heating.
Here are the latest schematic and parts list I made:

Okay then, I'm going with your schematic. I just want to ask that weather all the components are available as what described in schematic or not.
Thank you!

 

The bridge rectifier, driver transistor and output transistors need heatsinks. Many people have built my improved version shown on the parts list and schematic I posted and they say it works fine and is reliable.

 

The bridge rectifier, driver transistor and output transistors need heatsinks. Many people have built my improved version shown on the parts list and schematic I posted and they say it works fine and is reliable.

Thank you... I'll make as per your schematic and post the result when its done.

 

Hi Audioguru,
You gave me schematic of power supply based on TLE2141, but the thing is i can't find that IC anywhere in local electronics market. It is available on AliExpress which costs more than anticipated.
You once told me that schematic based on tl081 has a flaw, that it requires negative voltage to run. Can you please redesign the schematic according to the tl081.

 

See

 

See
View attachment 154896 View attachment 154897

In previous schematic which Audioguru gave have diodes that clamps the positive AC voltage at the negative rail, and this circuit dose not have any. Instead the one wire from AC supply is directly connected to negative supply of all the IC. Wouldn't it cause the IC to heat up?

 

In previous schematic which Audioguru gave have diodes that clamps the positive AC voltage at the negative rail, and this circuit dose not have any. Instead the one wire from AC supply is directly connected to negative supply of all the IC. Wouldn't it cause the IC to heat up?

Here i meant clip instead of clamp

 

There is a limitation on the input voltage - 30 volts.
If you want to use a higher voltage, the negative pins of the operational amplifiers must be fed through a zener diode (it will reduce the supply voltage). But you must understand that with your operational amplifier you can not get a voltage greater than 25 volts! No wonder the author used a higher-level operational amplifier. I used three transistors on the output, and not two, so the last amplifier gives a small output current. Most of all the middle amplifier is heating (its current is 7 mA, power is 5.6 mA * (30V-11.2V) + 30V * 1.6mA = 150mW.
I can design a new circuit (what I showed is just an inverted circuit) that will provide 30 volts or more, but it will be a completely different circuit!

 

There is a limitation on the input voltage - 30 volts.
If you want to use a higher voltage, the negative pins of the operational amplifiers must be fed through a zener diode (it will reduce the supply voltage). But you must understand that with your operational amplifier you can not get a voltage greater than 25 volts! No wonder the author used a higher-level operational amplifier. I used three transistors on the output, and not two, so the last amplifier gives a small output current. Most of all the middle amplifier is heating (its current is 7 mA, power is 5.6 mA * (30V-11.2V) + 30V * 1.6mA = 150mW.
I can design a new circuit (what I showed is just an inverted circuit) that will provide 30 volts or more, but it will be a completely different circuit!

Based on which IC you will design the new circuit?

 

LM324 - 4 OP

 

LM324 - 4 OP
View attachment 154909

Output is stable... Great!!
But the image is blur. Can you please upload a sharp image.
Also the spice model doesn't have the power rating of components mainly resistors. Can you tell me those rating so I can redraw the schematic using Easy eda.

 

I just want second opinion from Audioguru and Eric on the Bordodynov's design. After all the dreadful things happened with me while making this project i just want to be sure.

 

Output is stable... Great!!
But the image is blur. Can you please upload a sharp image.
Also the spice model doesn't have the power rating of components mainly resistors. Can you tell me those rating so I can redraw the schematic using Easy eda.

Unfortunately I will have access to my scheme only on Monday.Then I can fulfill your request.LTspice, which I use, It's easy to see the power of each component. I'll also try to optimize the frequency correction schemes.After all, this scheme is a zero option. I drew it right away without optimizing it, but immediately started the calculation. Unfortunately I did not manage to calculate the direct current. So I made a temporary calculation and used two resistors instead of a potentiometer. Resistors depend on the time (simulating the movement of the slider of the resistor). In this way, I simulated the adjustment of the output voltage.

 

I just want second opinion from Audioguru and Eric on the Bordodynov's design. After all the dreadful things happened with me while making this project i just want to be sure.

If you install LTspice and add my collection of models (there is a link to it on this forum), then I will upload my schema and you will be able to independently explore this project.