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Re: 555 Timer Question

Subject: Re: 555 Timer Question
From: "DSallee"
Date: Fri, 23 Dec 2005 18:52:38 GMT
Newsgroups: sci.electronics.basics
"semaj" <[email protected]> wrote in message 
news:[email protected]
> This 4060 timer chip, is it also known as M54HC4060? Thanks.

Not exactly sure... the article only says "4060 Ripple Counter"

Here is an update on the schematic... I added some relays to control the 
output switching...

This should work.. no guarantees because I haven't built it to make sure it 
would work :) .. logically and on paper it should...

I have made 2 schematics, one showing the positive cycle and one showing the negative cycle...

You will notice that with each 15 minute pulse of the 1st relay, the other 2 
relays will switch polarities on the output you are needing switched... 
giving you the cycling you wanted... +9v for 5 minutes then -9v for 15 
minutes then back to +9v for 15 minutes and so on....

Hope this helps

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