The circuit powers the load via the regulator’s input instead of its output. Because the regulator’s
output sees constant dummy load R1, it tries to consume a constant amount of current, no matter what
the voltage across the actual load really is. Hence, the regulator’s input serves as a constant-current
source for the actual load. Power the circuit with any one of the commonly available ± 15- or ± 12-V sup
plies. The voltage dropped across the regulator and dummy load decreased the total compliance voltage of
the circuit. You set the load’s current with R1. The current equals 1.25 A /ohms x R1.
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