Op Amp Current Source. Remember the following rules about the ideal opamp 1. This mosfet op amp circuit is more reliable than a simple bipolar transistor driven source.
The output of the op amp is connected to the base of a power transistor ignoring the darlington pair which controls how much current can flow through the circuit. Op amp current source oscillating. The voltage across the resistor is fed into the negative input of an op amp and a fixed known voltage is fed into the positive terminal.
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There is a special category of high output current amplifiers with current capability approaching or even exceeding 1000 ma. A typical op amp can be expected to continuously sink or source not more than 30 or 40 ma though some parts can handle closer to 100 ma and others will struggle to give you 10 ma. Using ref200 and one external op amp. The amount of leakage current is extremely small.
