Hi I'm trying to find a cheap solut
Hi I'm trying to find a cheap solut
(OP)
Hi I'm trying to find a cheap solution for a galvanic separated point to point RS485 bus. I need to send data between these 2 points in 1/2 duplex. There are full solutions for it like the www.linear.com/product/LTM2881 however these are very expensive and I would blow my complete budget on these babies.
There are some other standard solutions with opto couplers and a 2nd power supply however I don't like these either.
I came up with this idea (more or less based on the old appletalk or local talk as it was called I believe.) using 2 pulse transformers on both ends of the line.
I'm going to use manchester coding at a 100Kbits/sec data rate.
My question anybody any better ideas/suggestions?, any people having experience with this kind of set-up?, any advice type/model for the pulse transformers? my budget is max 2€ per point to point link on materials.
so including resistors, capacitors schottky diodes etc Excluding PCB, design costs etc.
All help/pointers welcome.
Thanks Jan Z.
There are some other standard solutions with opto couplers and a 2nd power supply however I don't like these either.
I came up with this idea (more or less based on the old appletalk or local talk as it was called I believe.) using 2 pulse transformers on both ends of the line.
I'm going to use manchester coding at a 100Kbits/sec data rate.
My question anybody any better ideas/suggestions?, any people having experience with this kind of set-up?, any advice type/model for the pulse transformers? my budget is max 2€ per point to point link on materials.
so including resistors, capacitors schottky diodes etc Excluding PCB, design costs etc.
All help/pointers welcome.
Thanks Jan Z.





RE: Hi I'm trying to find a cheap solut
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Hi I'm trying to find a cheap solut
RE: Hi I'm trying to find a cheap solut
RE: Hi I'm trying to find a cheap solut
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Hi I'm trying to find a cheap solut
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Hi I'm trying to find a cheap solut
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Hi I'm trying to find a cheap solut
PS. "Dan" don't what your link means I can't open it?
RE: Hi I'm trying to find a cheap solut
comes to less than $1/each
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Hi I'm trying to find a cheap solut
But with a 10 lower frequency would mean a lot more phase difference and with capacitors on both sides of the cable would that mean doubling the capacitor size.....Wonder if it would work.... Food for thought All comments welcome!
RE: Hi I'm trying to find a cheap solut
Z