NE556 doesnt seem interchangeable with LM556 Answered
Hi, built this 556 timer-flasher many times with a NE556, always worked. Made this triple one with NE556's and can only get it to flash but not time! Put a LM556 in its place and works perfectly. Never had to do this before, but then put a 0.01uF on #3 and #11 and #4 to Vcc on a NE556 and still doesn't time. What is really weird, I built one 2 weeks ago with LM556 at ends (thought they were NE556) and a NE556 in the middle and they all worked fine, don't get it! I thought NE556 and LM556 were interchangeable.
The main components are the same, pullup resistor 10K, RGB LED, timing resistor 1M, cap 10uF, it must be something very simple I'm over looking but cant figure out what.