Steve Herschbach Posted July 13, 2020 Share Posted July 13, 2020 46 minutes ago, The Seeker said: I sort of figured the running hot part was due to it being a high power unit that likes to a consume a lot of volts/amps. That nails it, and only time will tell if the components used are up to the long term task. So far, hand built, carefully tested detectors, and a roughly 10% failure rate. Link to comment Share on other sites More sharing options...
bklein Posted July 14, 2020 Share Posted July 14, 2020 Wow, 131 degrees is pretty hot for a consumer product. Does it vary with TX frequency/pulse settings? Link to comment Share on other sites More sharing options...
Willy Posted July 14, 2020 Share Posted July 14, 2020 On 7/13/2020 at 4:40 PM, Steve Herschbach said: That nails it, and only time will tell if the components used are up to the long term task. So far, hand built, carefully tested detectors, and a roughly 10% failure rate. The main heat generators are the MOSFET and the damping resistor. The MOSFET has been carefully selected for its low RDSon and to sustain the high flyback voltage. Just the JOULE's law (W=RI2), large current even in low resistance--> heat This is the price to pay for a powerful PI with the current technology. The switching power supply itself does not generate heat. Thus, no worry about the long term reliability on that subject. 2 2 Link to comment Share on other sites More sharing options...
bklein Posted July 14, 2020 Share Posted July 14, 2020 Seems like the recognized limit is 140’ F so it should be ok. Link to comment Share on other sites More sharing options...
The Seeker Posted July 14, 2020 Author Share Posted July 14, 2020 On 7/13/2020 at 7:40 AM, Steve Herschbach said: That nails it, and only time will tell if the components used are up to the long term task. So far, hand built, carefully tested detectors, and a roughly 10% failure rate. I hope nobody accidentally goes into the water after running the machine for a while or it might end up like the Equinox. Looks like my machine will make it to Fisher by tomorrow morning. Link to comment Share on other sites More sharing options...
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