Regulated power supply (darlington power) for LM317 10A 1.2..37V

Hello! A question to Mr. Krzysztof and / or other forum users: is it possible to easily adapt mosfet transistors to the power supply of P. current. Of course, after using or building the correct transformer.

Hello! Silence in the topic, so I decided to implement one of the power supplies from the crowd of topics on the forum as part of the loose winter runs.
The assumptions are: everything from recycling except electronic actuators or those that I do not have. Aesthetics is a quaternary thing and, therefore, hand-made elements, if necessary, such as the manufacture of a transformer. The cost in live cash is up to PLN 200.
I converted the transformer from a microwave, because dogs hang terribly on the forum on these hits, that they are welded, that losses are not suitable, etc.
In fact, to get the parameters as such, you need to double the primary and here I got from almost 3A to idle 0.36A, but unfortunately I had to compromise, because I would not press the secondary one with a decent diameter of wire according to the conversion factor of 3A per mm sq. This is to be bypassed, but I didn't get another identical hit. The transformer, in short, has three separate coils on the secondary, but they are bifilar wound (in fact, the wire is recycled and there are as many as 12 of them, but they are divided into two windings in each coil). The control takes place via 9 automotive relays controlled by a 12-position single-line switch via 12 transistors and powered by a separate small transformer. In this way, I obtained 12 thresholds, roughly a step of 2V to 3V depending on which coils are connected. There are fractions, but the machine works and I don't remember what the exact voltages were before the bridge and filter. In total, the step control behind the bridge came from 2V to 35V with a bit.
Due to the fact that the total cross-section of the secondary windings does not meet the above-mentioned condition, the way of connecting individual coils is such that up to 6 positions, i.e. almost 14V, you can easily take 20A, above max 11A. I will, because I have provided this option, also an automatic winding switch, but now I do not have time, so next winter the work is as it was. There is also microwave cooling. Heatsink of the dispute also made of 3mm aluminum sheet. Housing from some sort of ventilation tunnel from an old hood. The base is made of an old wall unit.
We bought transistors, emitter resistors, zener diodes, and capacitors because the recycled ones were scrap.

Now the most important thing, because everyone who reads this is shouting at me, I chose the project of Mr. Krzysztof723 from the topic: Power supply 1.25 to 25-30V10A with short-circuit protection, post No. 18 fig 6.
The changes I made were 0.33 ohm emitter resistors for bd249c transistors, I added a fourth bd250c transistor, a diode on the schottky 20A-200V output because that was what I had and small diodes that I had at hand, so that they only meet the conditions of the diagram.
The power supply is huge, because I did not play with miniaturization, besides, the fingers are not the same, and I packed it quite densely.
The voltage jump at the output does not exceed 4V. I even reworked the microwave soft starter because the original one turned out to be too weak, but not because of the load, only the additional elements of the microwave, which are not here, are involved in its work. In my opinion, it is unnecessary for me because I have a strong 16A installation and 2.5mm square wires for sockets.
The power supply took off and the only change I made after starting it was to change the resistor at the LM350 from 210om to 110om because it limited the voltage to 25V, and now I have to 32V.
I couldn't test its boundary parameters for a long time, anyway I had no such need, because everything I needed was fed to me without any problems. Today I came into the possession of a resistance wire, from which I made something like a resistor and I did a few tests, for example:
from idle voltage of about 22V it stabilizes my voltage of 12V to max 16A, from idle voltage of 32V it stabilizes my voltage of 24V up to max 7.5A. The current limitation, of course, depends on the set voltage and load, but when the bulb is loaded with about 8A, lowering the overload signaling turns on at 5A, but here the idle voltage was set with taps to 18V or 20V and adjusted to 12V. Depending on the set voltage with taps, it starts to lower the voltage at various points, but one thing is noticeable that when the overload is signaled, the voltage drops sharply. Nevertheless, the current can be further limited to about 2A, but the meter is analog, there is probably some error. The overload signaling is interesting, i.e. it goes out only above 4V at idle, but lowering the voltage, it lights up only at 2V, of course at idle. It doesn't bother me, and I haven't thought about it too much. Probably the transistor closes and opens in this spread and one of the resistors would have to be changed, or it is related to the charging of filter capacitors.
I did not check the maximum upper limit because the 16A was blowing on the switch setting above 6 positions, so I should not exceed these 11A at least until the transformer temperature monitoring and possibly other points were installed.
From what I noticed, the bd250c emitter resistors were barely noticeably warm, and the 249c transistors and their resistors were grave cold.
Short circuit test approx. 1 minute approx. 4-5A, no negative consequences.
Let me put it this way: there is no madness, but this implementation clearly confirms that Mr. Krzysztof's project is not only correct, but allows a lot, including the use of elements from scrap, and is even perfect for a project commonly known as DIY. It allows you to connect, of course, to the right places, with all attachments, e.g. for automatic battery charging, etc.
For the implementation of the so-called DIY for non-professional applications, and even to some extent such, the criticism about microwave transformers is completely unbelievable. These are normal transformers for specialized use and therefore their conversion is problematic due to welding and too small windows. It is enough to have a clean, same core and the problem is gone. I converted a smaller one into a welder for someone and they just keep talking. I myself have a welder of two of these and it works quite correctly and the time can be set from approx. 03 sec. up to 14 sec. Were it not for too large a difference between the hits (over 10%, approx. 14%), the action would probably be completely repeatable.
The idea of building a structure with my own hands is sensible for me when it meets the above-mentioned minimum assumptions (the PLN 200 limit is a matter of assuming savings on the project).
Building something only from ready-made purchased elements, in my opinion, does not meet the requirements of the DIY project.
Over the years, this is the 5th or 6th power supply I have built, rather the first one that can be called fully regulated.
I distributed the old ones and it was necessary to build a new one.
I would like to add that the design is so simple that I put everything on a spider and even that was more comfortable for me due to the unusual dimensions of the power supply, i.e. long and narrow. I am satisfied and formally thank Mr. Krzysztof for a successful project.