What is the voltage across R3 at the maximum output, does the led light up,,maybe Q5 is faulty?

Yes I changed base and collector on PCB. Thx for help

 

Can someone explain to me, why would you even try to design such high power linear regulator when world has moved a long time ago towards switching regulators? I do get it if someone wants to explore but this is not a way of making properly designed electronics.

 

(an aside: In about 1982 I had to design the power system for a broadcast television camera at the end of hundreds of meters of cable. My first inclination was a switching power supply, but then I remembered the the months of getting the power supply noise out of the picture of the previous product. Broadcasters are picky about things like that. Instead I used a ferroresonant transformer at the control end of the cable and a large iron and copper 60 Hz transformer at the camera end. The extra weight was welcomed since it was a studio camera and size and weight were important. The power supply was not a problem with that product and that made getting the thing out the door to customers a lot faster and easier. Lesson: Switching power supplies are not always the best solution.)

 

Since the Thread-Starter has stated that he wants to "learn about" Power-Supplies,
the first thing that needs to be addressed is how little "efficiency" is going to be practical
in view of the outlined requirements of the Power-Supply.

For a Linear-Regulator which is converting ~5-Volts to ~3.3-Volts, at maybe ~50mA of Current,
the Heat-Dissipation, ( efficiency ), is not going to be too much of a concern.
But when contemplating a ~50 or ~60hz, 150-Watt Output, Linear-Power-Supply
the efficiency becomes a MAJOR consideration.

There could easily be ~150-Watts of Heat , or more, that must be dissipated into the Air.
This can be reduced down to maybe ~30-Watts with a well designed Switch-Mode-Power-Supply.

Maybe no thought was given to the Output-Power of the Power-Supply.
These specifications may be arbitrary numbers just pulled out of thin-Air.
Evidently, there is not yet any proposed use-case for this example of a Linear-Regulated-Power-Supply.
These factors make all the difference in the world when contemplating
the best way to approach the problem,
and the problems that must be overcome to have a Power-Supply that will
comfortably meet the requirements of the application.

Just because You CAN do something, doesn't necessarily make it the best solution.
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Since the Thread-Starter has stated that he wants to "learn about" Power-Supplies,
the first thing that needs to be addressed is how little "efficiency" is going to be practical
in view of the outlined requirements of the Power-Supply.

For a Linear-Regulator which is converting ~5-Volts to ~3.3-Volts, at maybe ~50mA of Current,
the Heat-Dissipation, ( efficiency ), is not going to be too much of a concern.
But when contemplating a ~50 or ~60hz, 150-Watt Output, Linear-Power-Supply
the efficiency becomes a MAJOR consideration.

There could easily be ~150-Watts of Heat , or more, that must be dissipated into the Air.
This can be reduced down to maybe ~30-Watts with a well designed Switch-Mode-Power-Supply.

Maybe no thought was given to the Output-Power of the Power-Supply.
These specifications may be arbitrary numbers just pulled out of thin-Air.
Evidently, there is not yet any proposed use-case for this example of a Linear-Regulated-Power-Supply.
These factors make all the difference in the world when contemplating
the best way to approach the problem,
and the problems that must be overcome to have a Power-Supply that will
comfortably meet the requirements of the application.

Just because You CAN do something, doesn't necessarily make it the best solution.
.
.
.

Just a simple question.. Your Schematic specified 1N4007 Diodes in the Diode Bridge.. But you used what looks like Schotky diodes. What diodes did you sub out for the 1Amp Rectifier Diodes specified? Schotky rectifier diodes have different Vf as well as faster transition times.

 

I didn't supply a Schematic in this particular Thread.
Are You addressing the Thread-Starter ?

The Thread-Starter was tinkering around with a Simulation-Program before actually
building a real Circuit.
Sometimes Simulation-Programs don't have the exact part-number for a component that You need.
A 1N4007 Diode would last about a half of a second at an actual 5-Amps of Output-Current,
but it may work just fine for a Simulation.

There are several tricks for reducing Bridge-Rectifier-losses,
but,
You should start your own thread where your specific questions can be answered directly.

This Thread has been quiet for a couple of weeks,
so it's likely that the Thread-Starter either got his questions answered,
or maybe has been busy with other stuff.

It's not unusual for a Thread-Starter to get his particular question answered,
and then never be heard from again.
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