define(`TITLE', `Another (better) MBus-Master, Part 5')
define(`DATE', `2014-02-08')
define(`CONTENT', `
As mentioned before, the setup introduced in part 4 suffered from interferences of the SMPS into the receive path.

Here, the SMPS has been separated onto its own board:

<a href="http://a385e-5.de/wp-content/uploads/2014/02/20140208-213036-e1391950621439.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/02/20140208-213036-e1391950621439-300x165.jpg" alt="20140208-213036.jpg" width="300" height="165" class="alignnone size-medium wp-image-388" /></a>

The SMPS is implemented using an LM2577 module, although first a XL6009 was planned, but this is a different story.

With the rest of the circuit, which has already been introduced before it looks this way:

<a href="http://a385e-5.de/wp-content/uploads/2014/02/20140208-213315.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/02/20140208-213315-225x300.jpg" alt="20140208-213315.jpg" width="225" height="300" class="alignnone size-medium wp-image-389" /></a>

And now the receive signals are very clear again:

<a href="http://a385e-5.de/wp-content/uploads/2014/02/20140208-213433.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/02/20140208-213433-300x225.jpg" alt="20140208-213433.jpg" width="300" height="225" class="alignnone size-medium wp-image-390" /></a>

Blue is the receive signal measured at the output of the comparator, yellow is the transmit signal measured as the bus voltage.

Here, for comparison to the screenshots in the last post, the trigger of the S/H device in blue and the output of the difference amplifier in yellow:

<a href="http://a385e-5.de/wp-content/uploads/2014/02/20140209-162211.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/02/20140209-162211-300x225.jpg" alt="20140209-162211.jpg" width="300" height="225" class="alignnone size-medium wp-image-396" /></a>
')