Using Transistor Tip122

Have you tried the search function on the forum? If you search TIP122 you might find something

hint: https://synthiam.com/Community/Questions/3050

And more Search is your friend!

DJ thats not what he is looking for ,RICH is using it as a switch ,to amplify that signal you need a non inverting op amp circuit with a gain of of 142.85 ,witch is a simple circuit,set it for 100 to 200 gain and with a pot you can adjust it.

I guess you need a circuit i can easy make a schematic or do a seach on the internet for (non inverting op amp circuit),just need a single op amp and 3 resistors.

Can do it with a transistor only it little harder with that much gain needed

TIP122 is a power switching darlington used mostly as a switch

You would like to use the current sensor as a switch, correct?