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<blockquote data-quote="Murray" data-source="post: 1104131" data-attributes="member: 3345"><p>TVS added.</p><p>Also a pre voltage divider to help the 1117 cope with higher voltages.</p><p></p><p>On the relay's side, the idea is to use a type of switch-mode converter.</p><p>Were monitoring the supply voltage for the setting. We can use the drive transistor as the switch, the massive inductance of the relay as the inductor and load, and the fly-back transistor as the rectifier. I suspect a switching frequency in the low KHz would be enough to regulate the current without getting into eddy current issues. A non conventional option.</p><p></p><p><a href="https://postimg.cc/6T56YrtD" target="_blank"><img src="https://i.postimg.cc/SQcXQd5N/500ds105-R0-4cct.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p><a href="https://postimages.org/" target="_blank"><img src="https://i.postimg.cc/kGNDjM8t/500ds105-R0-4pcb.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="Murray, post: 1104131, member: 3345"] TVS added. Also a pre voltage divider to help the 1117 cope with higher voltages. On the relay's side, the idea is to use a type of switch-mode converter. Were monitoring the supply voltage for the setting. We can use the drive transistor as the switch, the massive inductance of the relay as the inductor and load, and the fly-back transistor as the rectifier. I suspect a switching frequency in the low KHz would be enough to regulate the current without getting into eddy current issues. A non conventional option. [url=https://postimg.cc/6T56YrtD][IMG]https://i.postimg.cc/SQcXQd5N/500ds105-R0-4cct.png[/IMG][/url] [url=https://postimages.org/][IMG]https://i.postimg.cc/kGNDjM8t/500ds105-R0-4pcb.png[/IMG][/url] [/QUOTE]
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