Put a ceramic 0.1uF and 10uF, or larger, electrolytic across the power pins of the 555 timer.Can you tell me where in my diagram to put the decoupling capacitors?
To prevent junction breakdown, put some signal diodes anti-parallel to the base-emitter junctions. If the off LED lights dimly, you can try putting a 1k resistor in parallel with them. A better solution is to use N channel MOSFETs instead, so you won't have base current going through the off LED. Or have the transistors turn the LEDs off instead of turning them on.For the circuit on the right, what would be the way to fix it?
EDIT: add schematic showing first and last suggestions
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