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Tech Head - The Technology Section
The Work Bench and Soldering Station
V-Box blew up :(
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<blockquote data-quote="Vipersan" data-source="post: 913845" data-attributes="member: 325666"><p>So ..further experimentation this morning..</p><p>Inductors having already been tried along with increasingly larger electrolytic capacitors..</p><p>..and eventually transient suppresion along the lines of those outlined in the SVRH 1980 pdf ...</p><p>All failed to produce trouble free results.</p><p>After much head scratching earlier in the week...I could not understand why the designers of the G/V box use transformers with seperate windings for Motor and control supplies ..and why they simply didn't use one DC supply stepped down for 5v.</p><p>..and why I kept getting resets and unpredictable results.</p><p>I finally had the idea that transients were causing the problem and that these affected the sensitive control circuitry.</p><p>In the end I tried leaving the ground line common to both halves of the circuit but used a seperate 12v bench psu to feed the 5v regulators..</p><p>much as the transformer design did,..</p><p>Still I had issues ??</p><p>But as I suspected these transients were being generated on the ground line as well ...</p><p>Isolating and seperating both the 24V motor ...and 12v > 5v ....lines both DC source and crucially GND lines has so far produced results which are consistant and NO re-sets ..</p><p>fingers crossed this isn't going to suddenly change.</p><p>Conclusion..</p><p>I will go ahead and fit a totally seperate psu and supply for the control circuit as planned.</p><p></p><p>There may well be another way to approach this issue ...but this is by far the easiest.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 913845, member: 325666"] So ..further experimentation this morning.. Inductors having already been tried along with increasingly larger electrolytic capacitors.. ..and eventually transient suppresion along the lines of those outlined in the SVRH 1980 pdf ... All failed to produce trouble free results. After much head scratching earlier in the week...I could not understand why the designers of the G/V box use transformers with seperate windings for Motor and control supplies ..and why they simply didn't use one DC supply stepped down for 5v. ..and why I kept getting resets and unpredictable results. I finally had the idea that transients were causing the problem and that these affected the sensitive control circuitry. In the end I tried leaving the ground line common to both halves of the circuit but used a seperate 12v bench psu to feed the 5v regulators.. much as the transformer design did,.. Still I had issues ?? But as I suspected these transients were being generated on the ground line as well ... Isolating and seperating both the 24V motor ...and 12v > 5v ....lines both DC source and crucially GND lines has so far produced results which are consistant and NO re-sets .. fingers crossed this isn't going to suddenly change. Conclusion.. I will go ahead and fit a totally seperate psu and supply for the control circuit as planned. There may well be another way to approach this issue ...but this is by far the easiest. rgds VS [/QUOTE]
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Tech Head - The Technology Section
The Work Bench and Soldering Station
V-Box blew up :(
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