friends....i have a small requeat for u all... i need little help for my project...

i used op-amp 741 based instrumentation voltage amplifier to amplify a square wave of 0-10mA and 1Vpp....

the voltage got amplified to about 10V....current is 0-20mA

(my need is a current of 0-120mA and voltage above 2V)

can u please suggest a good current to voltage convertor or any current amplifier for my project...please reply soon

 

What load will the circuit be driving? It's unusual to specify both a current and a voltage.
A resistor is an excellent current-to-voltage converter .
If you have 10V available from the amp it can be applied to the gate of an NFET to control >>120mA.

 

sorry...my mistake i need to convert the voltage to current my friend...i.e that 10v to 120mA...can u give any of your simulation circuits

 

This will convert 0-10V to 0-120mA, provided you use a rail-to-rail opamp (not a741).

 

thanks pal...can u suggest a good rail to rail opamp for this circuit

 

There are many to choose from. See e.g.
http://uk.farnell.com/jsp/search/br...arametricAttributeId=&prevNValues=2031+203333

 

thanks my friend