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Tech Head - The Technology Section
The Work Bench and Soldering Station
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<blockquote data-quote="Vipersan" data-source="post: 914200" data-attributes="member: 325666"><p>The actual relay control (coil) voltage is actually 12v ....SRD-S-1.12</p><p>So I have the right control voltage in place ...</p><p>I do however take your point about reversing the motor when in motion...and this I believe MAY have been the reason for smpsu failure..and why transformer supplies are used..</p><p>This is my gut feeling anyway..</p><p>So before I fit ..try...and destroy another smpsu..</p><p>Suggestions for mods to the schematic above are imo what need most attention.</p><p>Anyone have any useful ideas ..?</p><p>Yes we can limit the surge through the relays/motor either with a WW resistor ...NTC thermistor ..or crudely with a lightbulb..</p><p>Any better ideas ?</p><p>Back EMF being the killer I think..</p><p></p><p>I really dont want to go back to a transformer ..but unless a viable solution can be found ...I may have to..</p><p>Can't go changing psus every week..</p><p></p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 914200, member: 325666"] The actual relay control (coil) voltage is actually 12v ....SRD-S-1.12 So I have the right control voltage in place ... I do however take your point about reversing the motor when in motion...and this I believe MAY have been the reason for smpsu failure..and why transformer supplies are used.. This is my gut feeling anyway.. So before I fit ..try...and destroy another smpsu.. Suggestions for mods to the schematic above are imo what need most attention. Anyone have any useful ideas ..? Yes we can limit the surge through the relays/motor either with a WW resistor ...NTC thermistor ..or crudely with a lightbulb.. Any better ideas ? Back EMF being the killer I think.. I really dont want to go back to a transformer ..but unless a viable solution can be found ...I may have to.. Can't go changing psus every week.. rgds VS [/QUOTE]
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The Work Bench and Soldering Station
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