LED Constant Current Source Circuit Diagrams

led-constant-current-source-circuit
LED Constant Current Source Circuit Diagram

LED Constant Current Source


A simple LED can be used to stabilize the current in a circuit. A transistor and a LED function together as a stable current source.

Circuit 1 shown in diagram 67.0 is the simplest version. T1 works as the on-off switch of the LED current source.

Circuit 2 shown in diagram 67.1 is an improved version by adding an extra transistor.

The constant current delivered by the circuit can be found mathematically by: Current (I) = 0.6V/R1

Printed Circuit LED Constant Current Source (A)


Printed Circuit LED Constant Current Source Circuit Diagram A

Parts Placement Layout LED Constant Current Source (A)

Parts-Placement-Layout-LED-Constant-Current-Source-(A)

Printed Circuit LED Constant Current Source (B)

Printed-Circuit-LED-Constant-Current-Source-(B)

Parts Placement Layout LED Constant Current Source (B)

Parts-Placement-Layout-LED-Constant-Current-Source-(B)

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