ok guys... i think the l298 and the 555 timer could be an easy solution...!
but the problem is that this is the first time i work with a 555 timer... how can i get the 2 hz frequency ??? and what is the most common 555 timer IC ??
and about the l298 what are the EnA and the EnB pins for ??

 

i think it depends on the resistance between two of the pins?

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hmmmm thinking abt the dpdt relays and 555 timer...
the 555 timer should work on 5 volts or it could work on 12 volts ??
anyway ... what would u recommend for a dpdt relay that work with the 555 timer and 12 volts dc motor ?

 

and could a relay handle switching 2 times every second.... ??? ( 2 hz frequency )

 

Yes it can - but can the motor handle it?, and why do you want to do this anyway?.

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i m trying another oscillating motor circuit..like for beam bot application...
but i was thinking... how should i connect the motor to the relay so it would be forward and backward..i know how to do it to make it on an off....and what relay shell i use ?

 

Thinking the same thing, he is not asking for speed control just fwd/rev and it would all run off +12V, also a lot cheaper!.

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could anyone help me abt the dpdt relay... i really don t know a lot about it and can t find any blockdiagram for it on the net...

 

You might perhaps know it as 'two pole changeover'?.

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Hi,
This should give you the basics, calculate the 555 timer components yourself, get the 555 datasheet from www.datasheetarchive.com

Does this help?

The pic file is being rejected?, I'll be back

Hi again!

Had to redraw, excuse quality.

Before you go any further, make sure your motor will reverse, when you reverse the battery connections, some motors may not!

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/