Add more then one LED

Thread Starter

jrote1

Joined May 5, 2012
1
circuit.JPG

I currently have the circuit attached above. I would like to have 3 LED's replacing the 1 LED but the problem is when I add another LED the brightness decreases what can I do to get over this?

Thanks In Advance
 

SgtWookie

Joined Jul 17, 2007
22,230
There's a bit more to it than Ohm's Law.
I see a variable resistor set to 5.58k in series with a 22k resistor providing the base current for an emitter follower transistor.
The emitter has a 470 Ohm resistor limiting maximum current through the LED.

I'm not quite certain why you have the transistor wired as an emitter follower on the output of the 555 timer.
Were you trying to make the brightness of the LED(s) adjustable by changing the variable resistor?
Or is the idea to have the LED(s) fade in slowly?
 
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