Help me to build this circuit

Thread Starter

Abdalrhman Sabry

Joined Mar 4, 2017
7
Hi
I'm new in circuit world and i need to now can i build circuit which can turn off the power after a while i had chosen between many options like 30min -1h -1,30min-2h-2,30h.
If i can please give me the name of circuit and a plan for it,please.
Thanks .
 

dl324

Joined Mar 30, 2015
10,044
Welcome to AAC!
Hi
I'm new in circuit world and i need to now can i build circuit which can turn off the power after a while i had chosen between many options like 30min -1h -1,30min-2h-2,30h.
If i can please give me the name of circuit and a plan for it,please.
Members give free advice but our time is still valuable to us and few will work for free.

Describe what power you want to turn off and what you've found so far.
 

djsfantasi

Joined Apr 11, 2010
6,165
Yes.

Here is the plan.

No seriously. What power to what device? Makes a large difference if you are switching power to an LED or to a large electrical motor, like an air conditioner.
 

ian field

Joined Oct 27, 2012
6,539
Hi
I'm new in circuit world and i need to now can i build circuit which can turn off the power after a while i had chosen between many options like 30min -1h -1,30min-2h-2,30h.
If i can please give me the name of circuit and a plan for it,please.
Thanks .
We're not mind readers - you need to state whether mains or low voltage and AC or DC.

If you're dealing with mains; this forum has some rules you need to get aquainted with - otherwise the moderators will close your thread.

There are dozens of circuit topologies that will do the job - knowing some background would make it easier to suggest something appropriate.
 

Thread Starter

Abdalrhman Sabry

Joined Mar 4, 2017
7
We're not mind readers - you need to state whether mains or low voltage and AC or DC.

If you're dealing with mains; this forum has some rules you need to get aquainted with - otherwise the moderators will close your thread.

There are dozens of circuit topologies that will do the job - knowing some background would make it easier to suggest something appropriate.
Iam sorry about that
I neet it for AC 5V 1A
 

dl324

Joined Mar 30, 2015
10,044

hp1729

Joined Nov 23, 2015
2,304
Design 1129 delay.PNG
Hi
I'm new in circuit world and i need to now can i build circuit which can turn off the power after a while i had chosen between many options like 30min -1h -1,30min-2h-2,30h.
If i can please give me the name of circuit and a plan for it,please.
Thanks .
Okay, here is a starting point. An adjustable timer. We need to get more specific to develop this. Minimum time? Maximum time? Powered by what? What is being controlled?
not knowing what your abilities are ... can you build it from a schematic? Can you select and buy parts?
 
Last edited:

djsfantasi

Joined Apr 11, 2010
6,165
Seriously what is your skill level? Can you solder? Have you used strip board before or can you design/make your own PCBs?

Do you want the fan to start at the specified time or do you want it to stop?

I tend to ask a lot of questions. But I have an idea using a few chips and supporting components. It's based on a CD4060 and a CD4017.

Answer all of my questions and I may be able to help.
 

absf

Joined Dec 29, 2010
1,942
Hi
I'm new in circuit world and i need to now can i build circuit which can turn off the power after a while i had chosen between many options like 30min -1h -1,30min-2h-2,30h.
If i can please give me the name of circuit and a plan for it,please.
Thanks .
This item would gave you a delay from 1S to 40H.

http://www.ebay.com/itm/AT41-Delay-Circuit-Module-Timing-Switch-1s-40h-DC-3-27V-For-Delay-Switch-Timer/371811030854?_trksid=p2047675.c100005.m1851&_trkparms=aid=2220072&algo=SIC.MBE&ao=2&asc=41393&meid=4c21d2cd93eb4dac9de979bcf2d6c12c&pid=100005&rk=1&rkt=6&sd=181584902166

You can use the NO contacts of the relay to switch on your device. After the amount of time delayed, the relay would operate and switch of your circuit.

I believe the 14 pin chip is a mcu. Using discrete logic chips, you would be able to do it with less than 3 or 4 chips to get such a wide range of time delays. Definitely not using LM555.

Allen
 

absf

Joined Dec 29, 2010
1,942
Seriously what is your skill level? Can you solder? Have you used strip board before or can you design/make your own PCBs?

Do you want the fan to start at the specified time or do you want it to stop?

I tend to ask a lot of questions. But I have an idea using a few chips and supporting components. It's based on a CD4060 and a CD4017.

Answer all of my questions and I may be able to help.
Good idea. Can you get 30 mins out of 4060?

Allen
 

djsfantasi

Joined Apr 11, 2010
6,165
Good idea. Can you get 30 mins out of 4060?

Allen
Yes. I think if you make the RC network with 180k Ω and 1.8MΩ resistors and a 220μF capacitor, I think a CD4060 will output a 100msec pulse on pin 14 every 30 minutes. I did the calculations earlier today but they need to be double checked. These values will result in a 9.1Hz clock or 16,384/1800.

I was going to feed this into a CD4017 where the decade outputs would enable timings of 30 minute multiples. Was working out the hold and reset circuitry.
 
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