hai to every one
3years back i asked for a timer 4546 cmos i got help from u

the time i designed worked in alternate on /off every 15 min.

right now i like to know with this same ic 4546 will i be able to make it switch of after 8 hours .same time it has to work on/ 15 min off/ 15 min. alternately.

will it be done with a single ic.

the power supply is a transformerless one.

please guide me

thank u

 

As far as I can tell, there is no 4546 timer. Did you use the wrong part number?

__________________
Ron

 

I Believe you mean a 4541.

There is a Construction Article on this timer in my Projects Page on my site.

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Another possibility is MC14536B, a 24 stage ripple binary counter with 16 stages selectable with a binary code. Mouser carries the HCF4536BEY for 86 cents.

__________________
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thank u chemlec

u are right,it is 4541,i typed wrongly.hope i will get a working circuit from u.

another exciting thing is, the man u guided me in this timer project with a complete circuit ,and constantly replyed me through e-mail.once again
standing frist to help me .

Russell Kincaid, sir hope u know me thanks once again.i am back to trouble u with querries.

till than i will check out what u said
thanks both of u

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It can probably be done with 2 555's or 2 7555's, but I know nothing about the chip you specified.

__________________
-=: The best low-priced components to troubleshoot with are the speaker and the LED :=-

 

mstechca, The CD4541, You should check it out.
"Milli-Seconds to Hundreds of hours of timing".

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The 4541 won't do what you want, but the 4521 will, see below. I have not tried this but think it will work. When Q24 goes high, the clock stops but the counter is not reset. You have to press the reset button to make it go again.

Attached Images

8_hour_timer.gif (12.3 KB, 510 views)

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Two of the 4541's will do what he wants.

One as a one time for 8 hours , cycling the other one at 15 minute cycles.

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The reason i made this timer is to run a liquid musquito repelent device in alternate on /off timing so that it saves more liquid.

two years back itself i got the circuit from u .but one of the leading company in india came with the same idea and released recently.when i opened the device i was amazed to see the same dicto of what i did.

their idea is to switch of after 8 hrs of sleep.

what i want to do is combine 15 min cycle and 8 hrs of working.

because i always forget to switch it off in the morning.

has i have already told i am a business management guy, i am only a electronics admirer.i want to do many things but i am not specialized so when ever i come up with some crazy ideas i always contact specialised people LIKE U ALL.i am just a assembler of circuit.so i need u all teach me like a baby.

but i am a quick learner i proved it by designing a timer by getting help from u all.

thanks sir for the circuit,but the manual reset is only bothering me.

will come with more querries.

ambrose

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If you want "State of the Art" Electronics, Probably someone could do this using a Progeammed, PIC or a Microprocessor Chip.

It would be a Much smaller circuit.

But I don't do digital stuff.

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Website: http://www3.telus.net/chemelec

 

Do I understand that you want it to automatically start up again after some time?

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another dum question

what is this pic is is same as micro controller

what program we have to know for PIC and how to do it.is it cheaper than normal ic

the main idea of me doing is i want to say to people that i made the cheapest timer.and also its really great when u see something come to life
by ur own hand, we feel like GOD.u know that .thats why i like electronics.

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A PIC is the most popular micro-controller, for your application only a small 8 pin one (or even 6 pin SM) is all that would be required.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

thank u all for the ideas
right now i am working on the abow design which mr rusllk gave .

i will come back if i get struck.

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