Hi guys
I hope somebody can help me out on this one. I need to switch on and turn off a device automatically at a particular time. (For eg. I want to turn on the device at 2pm and turn it off at 7:50am) Do I use something like a timer switch?
Any info from you guys will be highly appreciated.

Thanks

 

u can use a normal timer like the 555 for the purpose...

however if you really intend so much amount of delay as you mentioned in your example, then you might have to modify the circuit and perhaps add some more components (like a counter).. to acheive really long delays...

go through similar threads on the forum...

 

No, a 555 timer is not suitable because it isn't accurate enough and can't do delays longer than a couple of miniutes.

You could use a microcontroller or a CMOS IC like the CD4060, CD4541, CD4536 etc.

Why bother though?

You can buy timers that'll do this, already made.
http://www.google.com/search?client=...utf-8&oe=utf-8
http://www.maplin.co.uk/Search.aspx?...FQWIlAoddn2CMg
http://www.radioshack.com/sm-mini-pl...i-2102613.html

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There are programmable timers in home markets. The cheap ones are operated by a synchronous motor and work like a normal clock. To switch on and off a device connected to it via a programmable wheel which can be overriden by an extra switch. There also digital multi-channel switching timers.

The cheap ones are just about 5.00 EURO. For the digital ones you should plan for about 20.00 EURO +.

 

agree with you totaly
Only curious since when they acsept EURO in thailand (except the banks)