Flashing Led

149

02:26:26

Updated at 24/1 by dkristal 

published 8 years ago

BillyT

8 years ago

The basic circuit is not too bad, the 100k resistor is counterproductive to the circuit. The 555 could have handled the LED load with out the transistor. In using the transistor the capacitor on the base causes distortion, particularly when the correct biasing and led current limiting resistors are used. Suggested updated circuit enclosed; http://everycircuit.com/circuit/4545142332850176

mujaro3558

8 years ago

oooo

dkristal

8 years ago

@BillyT for the 100k resistor I m not sure. The transistor with capacitor on its base needs to make LED not just flashing but fading up/down

BillyT

8 years ago

Ok, not knowing about the fading, but the led current is a bit small, change capacitor for 68 uF, (current spikes a bit high, but getting a 80 uF capacitor is a bit hard), definitely get rid of the resistor.

dkristal

8 years ago

OK @BillyT ... Thanks

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.