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Replace reed switch with something else to continually close/open circuit

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ghh3rd

New Member
I have a device with a magnetic reed switch.

I want to replace the reed switch with something that will close/open the circuit continually, adjustable to anywhere from perhaps once per second to perhaps 4 times per second.

I imagine that the heart of this would be a 555 chip, but that's about all I (think) that I know. I have never constructed anything like this before.

Are there any simple plans anywhere to accomplish something like this?

Thanks,


Randyu
 

crutschow

Well-Known Member
Most Helpful Member
Need to know the voltage and current the reed switch is switching.

Why not just control the reed switch with a 555?
 

ghh3rd

New Member
Good idea. Leaving the reed switch in place, and using a 555 to control it would definitly seem like a better solution.

Now, can anyone point out a good way to do this? Only one speed is necessary. Perhaps I could tweak the circuit until I get to the desired speed?

Thanks,


Randy
 

ghh3rd

New Member
Gayan,

Will do -- but the reed switch requires a magnetic field; how will the 555 actually 'control' the switch?

Sorry if my question sounds obvious, but I'm new at this. I'd really like to get into building and eventually being able to design components.

Randy
 

crutschow

Well-Known Member
Most Helpful Member
I take it the reed switch is activated by a magnet normally.

In that case you would need to wind a coil around the switch. Any small tube (straw) that just fits over the reed should work as a coil form. Then you need to wind many turns of as fine a wire as you can find (such as 30Ga or finer). You will have to experimentally determine how many turns and how much current it takes to activate the switch. From that you can calculate the voltage and resistance in series with the coil will provide the required current.

Otherwise just substitue a reed relay for the reed switch. They have the coil already wound.
 
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