Re: looking for a 555 timer circuit

Yes, that happens.

I'm starting to think that U3 is bad, though. I see the clock on pin
9, toggling. Pin 16 (Vcc) has 5V. Pin 1 (clear) is high (5v). Pin 2
(Q1) is 2.2V. Pin 4 (D1) is 5V. Pin 5 (D2) is 2.2V. Pin 7 is 0V,
observed over 60 seconds, never changes. Pin 9 (clock) is toggling
0-5V every 15 seconds or so. Pins 10, 12 and 13 never change from 0V
observed over 60 seconds. I verified that Pin 8 (ground) has 0 ohms to
ground.

On U2, Pin 1 is 5V, Pin 2 is 2.2V, pin 3 is 0v.

If I'm understanding the logic correctly, every time the clock goes low
to high on U3 pin 9, the output should change: Q1 -> Q2 -> Q3.

Any thoughts?

.

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