simpliest circuit for constant DC voltage

[djalli]

this circuit has to be wehenever voltage input(a function generator) of peak to peak is between let say 2-50 volts i get out exactly 5 volts in reference to ground.

got to have a minimal number of elements in it. that is the catch. thank you.

 

[RegUser_2]

If the input has been between say 6V to 50V that's easy. All you will need a JFET connected as a current source, a 5V zener diode and a power buffer if needed.

Since your minimuum input is 2V, you will need a DC/DC converter with very loseless switching components.

Wish you luck.

 

[billano786]

Take a look at LM 2576 from National Semiconductor. I do not think that you will find a better solution.