This is a design for amplifier, but in this circuit, it is a low current. This is a simple design circuit for amplifier. The circuit is built by CA3140 as op amp the signal. The low input terminal current needed to drive the CA3140 makes it ideal for use in current amplifier applications like the figure in below.
In this circuit, low current is supplied at the input potential as the power supply to load resistor RL. This load current is increased by the multiplication factor R2/R1, when the load current is monitored by the power supply meter M. Thus, if the load current is 100nA, with values shown, the load current presented to the supply will be 100μA; a much easier current to measure in many systems. [Project Schematic source: Intersil Corporation].
In this circuit, low current is supplied at the input potential as the power supply to load resistor RL. This load current is increased by the multiplication factor R2/R1, when the load current is monitored by the power supply meter M. Thus, if the load current is 100nA, with values shown, the load current presented to the supply will be 100μA; a much easier current to measure in many systems. [Project Schematic source: Intersil Corporation].
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