LED Constant Current Source Circuit Diagrams
Layout 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.
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| LED Constant Current Source Circuit Diagram |
LED Constant 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)
Parts Placement Layout LED Constant Current Source (A)
Printed Circuit LED Constant Current Source (B)
Parts Placement Layout LED Constant Current Source (B)
