Re: looking for a 555 timer circuit

On 30 Jan 2006 05:45:56 -0800, "Wayne" <waynelewis@xxxxxxxxx> wrote:

>I'm looking at the data *** for the 4060, and it's not matching what
>you have in the schematic: Q11 doesn't exist on the data *** (I've
>looked at 3), and Q6 is on pin 4, not 6.

---
Yes, I explained that lack of naming consistency between
manufacturers in an earlier post. Regardless of the names used for
the outputs, the pin numbers I called out on the schematic (modified
by the post I made about the error I made) are correct.

Here's the essence of the post:

" In going over the circuit for the last time, (LOL) I found a few
errors:

1. U2-5 should be connected to U1-3, not U1-1

2. C1 should be an 0.18µF polyester cap.

3. R1 should be a standard 2 megohm +/- 5% 1/4W carbon film
resistor."

---
>I'm trying to figure out how
>the 4060 works, but haven't yet.
---

It's a ripple counter with an on-board oscillator
_ _ _ _ _ _ _ _ _ _ _
CP _| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_
___ ___ ___ ___ ___ _
Q0 ___| |___| |___| |___| |___| |___|
_______ _______ _____
Q1 _______| |_______| |_______|
_______________
Q2________________| |_____________
_____________
Q3________________________________|

and so on...

---

>What should Q11 actually be?

---
Depends on whose data *** you've got. Which one is it?


--
John Fields
Professional Circuit Designer
.

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