The circuit in post #18 looks reasonable, but how does the simulator get two different vol6tages on the output line? 20.4035 at the regulator, and 23.7434 at the output. I find that a bit confusing.

Also confusing is the use of a six digit voltmeter.

The output number that you see is not the voltage, but yes the current, so I devide the current by 3 darlington transistores to cause less power dessipation in LM317, at 1.5A max of output, I got only +/-200mA passing throw the LM317.

 

The unnumbered transistor below Q5 seems to have its Emitter and Collector interchanged OR it os a NPN transistor.

 

The unnumbered transistor below Q5 seems to have its Emitter and Collector interchanged OR it os a NPN transistor.

Yes, it has its collector and emitter connected backwards. It is supposed to begin turning on when the LM317 current in R2 reaches about 0.7V/22 ohms= 32mA.
I notice that the old 741 opamp is not powered.

 

Yes, it has its collector and emitter connected backwards. It is supposed to begin turning on when the LM317 current in R2 reaches about 0.7V/22 ohms= 32mA.
I notice that the old 741 opamp is not powered.

Sorry for bothering you, but do you think that is a good way to power LM741, (And sorry for the amateur questions, but I'm a "freshman" in this field )

View attachment 209264

 

Sorry for bothering you, but do you think that is a good way to power LM741, (And sorry for the amateur questions, but I'm a "freshman" in this field )

Looks okay. Could say better if you showed enough circuitry to be more certain.

 

Looks okay. Could say better if you showed enough circuitry to be more certain.

Here, ty! View attachment 209271

 

Here, ty!

The relevant part:

Not sure what kind of games you're trying to play by posting different schematics. The other one used a different zener.

It'll work, but the power dissipation in the zener could be reduced significantly.

Not sure why an LM741 is being used when only half of the LM358 is being used.

 

An op amp is always better if it has a decoupler on its power input pin,

 

BTW; You still have to get rid of all that power as heat , even if it is spread over multiple devices, so you are going to need a BIG heat sink, probably with a fan to make it a reasonable size / price in anything apart from 20 degrees ambient,

Something like this without a fan

https://www.digikey.co.uk/product-detail/en/wakefield-vette/512-12U/345-1212-ND/5068136

 

Looks okay. Could say better if you showed enough circuitry to be more certain.

First, the 741 amp is not the best choice, and second, the shunt zener regulator is very seldom a good choice for a load that might vary or be sensitive to noise.