Need some help

Resister of 3.5 Ohm to low

C

Solution : http://s16.postimg.org/yh86xd5qd/Screenshot_2015_08_17_03_36_24.png

They blow even if you remove output connection - you are feeding them too much voltage.

Even removing 3.51 resister and feeding output to the anodes (tops) of the LEDs the oscillation is STILL to fast and they just stay "lit". It works if you lower DC voltage and SLOW osc. This may not be what you are after - not sure.

Add 12.8 ohm parralel to the upper two leds and 10.5ohm parralel to the lower leds. It will limit the current through them. Your voltage feeding is correct bt current is near 80mA that is 4times of the needed. So i used the current splitters.

Remove your voltage source from the leds. Remove the wire short between the leds. Connect the output to the cathode (top) of your leds through a resistor. Adjust resistor until currrnt is under 20 mA

Remove wire 555 to 4 led es and voltages 4 v and in 4 leds cut beetween

Cfgu

Done ur problem http://everycircuit.com/circuit/6327713875886080

Well I figured that you might be a student using a schematic from a school book. I don't want to change stuff too much so i too a different approach. The load is burning out. That means too much current is through the LEDs. Although you could adjust the I max of LEDs, or whatever they call it here for max current, i noticed the current was different on the upper LEDs than the lower ones. I found there where only 2 things to do to fix the 2 problems (balance and load blow). By the way, i see no problem with your out being tied to the LEDs as you have it now. Maybe a resister wouldn't be to unreasonable and i don't know how the real life 555 is rated you might use, but here is my solution: ••••••••••••••••••• {Place a 11.9 ohms in parallel with the upper LEDs that you have in parallel} and {9.51 ohms in parallel with the lower LEDs you have in parallel}•••••••••••••••••. You can play with the balance between the two by changing the resistance values. Also, push on one top LED and push the eye in the lower left of component options to monitor the current or voltage, and one bottom LED, do the same. This is how to see the balance as you change resistance. I also monitor the resisters i put in and saw how much more current the top one took up than the bottom of the LED sets. I remember putting in some loading resisters when i was in school, so you might want to check around for in the future.

Also, i saw your top LEDs flash on at times the bottom is off, so that's also why i didn't say to disconnect the short between LEDs since its really not a short, both sides would, of course, need to feel the load. I assume you want them to flash at different times like this.

By the way, the values i gave will bring the LEDs up to there max current handling for the frequencies your running to them. In real life, i always put at least a little bit of loading resistance before an LED and don't really run to max. Usually I'll run stuff up to an RMS level (usually max times 0.707). When bridging amplifiers or large components, sometimes RMS of what was called max W may be found to seem different than n•0.707, but its usually because of the methods used to rate power and impedance changes or something. Sometimes its just marketing bull... Best wishes in electronics!

I solved this