25 lines
1.8 KiB
HTML
25 lines
1.8 KiB
HTML
define(`TITLE', `Another (better) MBus-Master, Part 5')
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define(`DATE', `2014-02-08')
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define(`CONTENT', `
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As mentioned before, the setup introduced in part 4 suffered from interferences of the SMPS into the receive path.
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Here, the SMPS has been separated onto its own board:
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<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>
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The SMPS is implemented using an LM2577 module, although first a XL6009 was planned, but this is a different story.
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With the rest of the circuit, which has already been introduced before it looks this way:
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<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>
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And now the receive signals are very clear again:
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<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>
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Blue is the receive signal measured at the output of the comparator, yellow is the transmit signal measured as the bus voltage.
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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:
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<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>
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