Electronics > Beginners
Trying to find a line receiver
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spec:
There was an error on the schematic for the IEBUS receiver attached to reply #12. R5 was the wrong value and has been corrected.

It is quite true that a worrying amount of current would have been injected into the line with the original R5 value, but with the correct value for R5, the injected current is only 70uA, The IEBUS is terminated both ends by a 120R resistor, so that makes the differential resistance 60R. 60R * 70uA= 4.2mV, which I suggest is OK.

There is a way to inject no current into the line, but it didn't seem worthwhile.
spec:
The biggest problem in designing an IEBUS transceiver is not the design task itself, but getting a specification for level 1 to design to. I have searched the net and have not found a specification yet.

But this link may be of use for anyone wanting to have a go at this task.  http://www.interfacebus.com/Design_Connector_IEbus.html

Now is your chance Tim- but no speeches, just a schematic will do nicely :)
viperidae:
I took a trip to the local electronics shop on my lunch break and bought a few comparators to play with. Jaycar doesn't have a huge selection.

Using this schematic http://softservice.com.pl/corolla/avc/sch/sch_avc.png with an LM311 I got acceptable results according to the dodgy Hantek
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