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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
16x 20 mA = 360 mA if your transistor has a gain of 100 (or 360) then the base current needs to be 3.2 (or 1) mA the 33k base resistor is waaay to high a value,
I would have 1k from pin3 to base, emitter to 0v load 16x(2x led+resistor) from +5v to collector. (1nF across the 1k would give nice quick on/off and off/on transitions) (anything in the 330pF to 33nF range will help)
It will work almost as well if you keep your present circuit and short-out the 33k resistor ... not required at all in this case. I'd expect to lose up to 2V due to pin3 voltage and base-emitter voltage thats the reason for my suggestion above.
P.S belated HAPPY 40th BIRTHDAY 555 i.e. we old guys were using 555s before most forum members were born !
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Patrick wrote ...
Camp Badger wrote ...
Ah, I'm still having trouble. Now the LEDs are just constantly off. My quickly (and terribly) drawn schematic is below. Thanks for the help!
disconect that cap on pin3 and base resistor!
Okay I removed both the resistor and cap and it still doesn't do anything. I also made sure that my transistor and timer are in working order (which they are)
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Fading 32 Led's with 555 timer's
