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Board_003: Add readme for simmulation

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Håkon Løvdal 2018-02-01 20:02:08 +01:00
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This directory contains various simulation of the M-Bus part of [MBus_USB.pdf](../doc/MBus_USB.pdf?raw=true).
The simulattions are done with [qucs-s](https://ra3xdh.github.io/) using [ngspice](http://ngspice.sourceforge.net)
as simulation backend.
The first simulation is as close to the original as possible and gradulally changed to
remove receiving parts and using a zener diode to have a constant 12V voltage drop
regardless of the power supply. The final version works with any voltage in M-Bus range.
![](mbus_master_004.png)