Re: [CAD_CAM_EDM_DRO] Re: Analog Opto Isolator?

Hi,
Hi Roger,

There are linear opto couplers that convert an analog voltage to an
isolated analog voltage. One such devive is the HCNR200

http://www.avagotech.com/products/product-detail.jsp?navId=H0,C1,C5231,C4945,C5011,P88938

There are others as well. Just not sure if it ends up being simpler though.

Cheers,

peter.


vrsculptor wrote:

> Graham,
> The zener with a resistor would work but I get no isolation. I would
> have to tie the micro ground to the EDM ground which would be seeing
> all kinds of RF from arcing. Peter Homann's suggestion of a digispeed
> with a zener to protect it should work. I was hoping for something
> simpler.
>
> What I wanted to do was to add a sense circuit to Jon's spark EDM. The
> Armite micro has an A/D and talks USB RS-232 so it can talk to Mach3
> on the mill. Mach3 through a charge pump could raise or lower the Z
> axis as commanded by the Armite. I was hoping to keep it simple and
> cheap enough so anyone could build add one to their mill with a
> minimum of cost and effort with no circuit boards.
>
> I am going to need to cut some rectangular holes in tempered clock
> type springs.
>
> Roger
>
>
>> You could just use a zener diode to limit the voltage to acceptable
>> levels.
>>
>> Graham
>>
>
>
>
>
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