For the circuit depicted below, known as a Howland current source, set V2 = 0, R1 = R3, and R2 = R4; then solve for the current /L when R1 = 2R2 = 1 kΩ and RL = 200 Ω. The value of current IL is V1/ A.
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For the circuit depicted below, known as a Howland current source, set , and ; then solve for the current when and .