after 3 years i am once again back for help!please help me!

[ambrose]

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

 

[Roff]

Re: after 3 years i am once again back for help!please help

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?

 

[chemelec]

I Believe you mean a 4541.

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

 

[Russlk]

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.

 

[ambrose]

sir hope u know me,another exciting thing

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

 

[mstechca]

Re: after 3 years i am once again back for help!please help

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.

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

 

[chemelec]

Re: after 3 years i am once again back for help!please help

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.

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

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

 

[Russlk]

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.

 

[chemelec]

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.

 

[ambrose]

i want to do it in one ic the idea is to make it cheap

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

 

[chemelec]

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.

 

[Russlk]

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

 

[ambrose]

what is this pic programable ic

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.

 

[Nigel Goodwin]

Re: what is this pic programable ic

another dum question

what is this pic is is same as micro controller

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.

 

[ambrose]

thank u for now

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.

 

[mstechca]

Re: what is this pic programable ic

what is this pic is is same as micro controller

A PIC IS a microcontroller and Nigel loves it :wink:

what program we have to know for PIC and how to do it.

All microcontrollers accept different opcodes in binary format. Depending on the opcode, the microcontroller outputs something different. But people have created assemblers which makes programming easier, and hardware (microcontroller programmers) is also created so that the computer sends the correct binary codes. Check out Nigel's website. He may have all of your answers on his PIC website.

is it cheaper than normal ic

If "normal" means your basic logic ic (such as AND gate, inverter, OR gate), the answer is NO (at least in Canada). If you compare it to other microcontrollers, it probably is.

the main idea of me doing is i want to say to people that i made the cheapest timer.

Well, you can get away with the 555 timer IC. Use it to make an on/off timer that goes as fast as you want. and there are several sites that show you how to use the 555 timer.

 

[mramos1]

If you are building one or two, the 555 ways is probably best. If you need many of these units the microcontroller way I think is best..

I like the AVR Tiny11 at $.50 each. You will need a programmer, and there is a free compiler for it at bastoc.com. The code would be pretty easy. And you would have pins to spare, maybe blink an LED.