Constant Current Sink

Goal: Will sink a constant current independent of the input voltage.

Range: 1mA to 5000mA. Max Vin 30V.

Ref 1 Build Notes

R15 @ 10K: Doesn't give enough current to the LM336Z5.0. Switch to a lower resistance, 3k9 works for 9v input but. If 9v battery is used, voltage will droop till 7v during battery life. R15=1k5 will give stable reference 5V with a Vbat of 9V5 to 7V. Quiescent current does go up, but usable battery life will still be longer.