电流源 Current Sources (and sinks)—understanding compliance range Bruce Trump We get many questions on our forums about designing current sources of all types—constant currents, voltage-controlled currents, AC currents, high currents, low currents, active current sources and passive current sinks. All different kinds. A single blog can’t begin to cover all this ground. I can, however, provide some basic background and links for more information. A key point:  A current source cannot force a current to flow into a load without applying the necessary voltage. Think of a current source as a circuit that adjusts its output voltage to cause the desired current to flow in the load. You can’t make a 10mA current flow into a 1k-ohm load without applying 10V. Or perhaps, mo……