Babar,

I know not your sheet, but the LM3900 looks not usable.
Its a current input amp: Uout = f(I+ - I-) !!!
And typical op-amps have a voltage input: Uout = f(U+ - U-).

On the LM3900 the input voltage was internally hold
at ~+0.7V (changing with temperature).
And so the LM3900 was only recommended for ac applications.

If you still want a power output (0..35V),
I suggest the power op-amp LM675 (max 3A).
It can also handle up to +/-30V (=60V) supply voltage.
For 0..35V output I suggest -5V and +40V supply voltage.
On other values watch, that minimal 3V below and above
the output voltage needed, and the sum not exeed 60V.

Typically op-amps only specified for +/-15V (=30V)
supply voltage (LM3900: max +/-16 = 32V !).


Peter