LED闪烁灯(英文)-----LED or Lamp Pulser with IC LM358
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.
Parts:
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
评论