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LED or Lamp Pulser (BC337)

2014-12-12 20:18  
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This article describes the LED or Lamp Pulser (BC337). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:BC337.

Astonishing effect

Circuit diagram:

LED Pulser


R1,R2___________4K7  1/4W Resistors
R3_____________22K   1/4W Resistor
R4______________2M2  1/4W Resistor (See Notes)
R5_____________10K   1/4W Resistor
R6_____________47R   1/4W Resistor (See Notes)

C1______________1µF   63V Polyester Capacitor

D1_____________5mm. Red LED (See Notes)

IC1__________LM358  Low Power Dual Op-amp

Q1___________BC337  45V 800mA NPN Transistor

This circuit operates a LED in pulsing mode, i.e. the LED goes from off state, lights up gradually, then dims gradually, etc.
This operation mode is obtained by a triangular wave generator formed by two op-amps contained in a very cheap 8 pin DIL case IC. Q1 ensures current buffering, in order to obtain a better load drive.
R4 & C1 are the timing components: using the values shown in the parts list, the total period is about 4 seconds.


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