L7808 Regulator 19v 20ampere Power Supply

[RendiArdian]

I was design 19 volt regulated power supply, but I don't know the exact value for the transistors, and I noticed at the voltsim output didn't reach the maximum 19 volt output, can anyone help me for the solution for my design, regards.

@all 

[AScha.3]

Why using a fixed 8V reg for a 19V supply ?

+

You have planned the cooling ? (need a big heatsink, + fan probably )

[RendiArdian]

@AScha.3 

@gbm 

Okay, done, thanks but...,

What about the T1,T2,T3 transistor type ?and, is my design will run correctly ?

Can you help me to test my design with yours Simulator ? What is the max. voltage output ?

[gbm]

Actually what you've designed is a big heater with an annoyingly bright lamp.

[Peter BENSCH]

@RendiArdian 

The schematic shows a current regulator that uses the potentiometer as a shunt. However, if your output parameters are actually 19V, 20A (even though you have drawn 1.9V), there would have to be 20,000V at the 1k potentiometer (20A * 1k = 20kV).

Please explain what your schematic is supposed to do or what you are connecting there, because (at least) something about it is not right.

Regards
/Peter

[RendiArdian]

@Peter BENSCH thank you so much for your help, well I see my pot act as a shunt instead as voltage divider. and I guess my 1k pot will give me 13.8 volt at half turn for my Dakai transformer and also can be used to turn my Laptop on at max. turn.