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timed repeat cycle relay

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jblair41

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I need to build or buy a relay that runs a cycle of closed for one hour and open for ~1.5 seconds over and over again.

I have an cable internet service proivder that cuts me off every hour when I am downloading at full bandwidth. It has nothing to due with my dchp lease, I have already checked that. The only way to get back on the internet is turn my modem on and off (my is working just fine also).

The modem uses a 12v dc 1amp power suppy. I was thinking I could cut one of the two wires, that run from the trasfomer to the modem, and attach a always closed relay. Then send a 12v pulse to the coil of the relay once every hour for about a 1.5 seconds, opening the relay, turning my modem off then back on.

Is their a better way? mabye use a flasher to the relay? How can I build what I need?

I know it's an off the wall thing but I would really like any help you guys could give. Thanks,

Joe
 
Use timer IC 555 in astable mode with off time = 1 hour and on time = 1.5 second. Since the duty cycle is less than 51% you need to use a diode in between pin 6 and 7 as shown in schematic at :
 
thanks, I have some sodering experance but I have never built a circuit with a chip. I have alot to learn. Are their any variations to the name of that chip? Do you know of a good place for me to start to learn what I need to know to built this?

Thanks
Joe
 
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