Re: looking for a 555 timer circuit

On 30 Jan 2006 08:15:22 -0800, "Wayne" <waynelewis@xxxxxxxxx> wrote:

>Ok. The only test equipment I have is a digital autoranging
>multimeter. I don't know if you saw my other post below, but the 4060
>pinout is different than the 4040, and does not have a Q11 output. Q6
>is on pin 4, so I changed that. I used Q12 for now instead of Q11.
>
>What I'm seeing now: Pin 9 on U3 (HC175) is cycling from 0V to 5V
>every 8 seconds or so. Pin 2 on U3 (HC175) is cycling from 0V to 2.2V
>at a large time interval (unsure how long, but greater than 30
>seconds), maybe due to me using Q12 on U1 (4060). I have not observed
>Pin 7 or 10 on U3 switching states. I'm double checking my wiring
>again to make sure I haven't missed something.
>
>Would me using Q12 on U1 cause any problems other than a longer on/off
>time?

---
Since everything on the 4060 is toggling and you're getting clocks
into the 175, the 4060 and all of its circuitry is working.

U3-2 should be cycling between 0V and 5V, so that 2.2V range
indicates that there's probably a wiring error there. I suspect
you've wired U3-2 to U2-1 instead of to U2-2.

As for the timing, I'll wait until I hear from you after you've
read all my other [recent] posts as well as this one, (so we'll be
in sync) and then we'll straighten out the timing, OK? :-)

--
John Fields
Professional Circuit Designer
.