| Electronics > Projects, Designs, and Technical Stuff |
| Another reason to hate "soft touch" power switches |
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| krayvonk:
Goes to show making your design fully solid state seems superior but it actually isn't in ways. |
| Bud:
--- Quote from: ejeffrey on July 18, 2019, 04:50:11 pm --- I'm sure some people religiously turn off the back power switch in those devices, but I suspect they are a tiny minority. --- End quote --- The people who do not cut power using hard switches are the reason i got a beautiful Philips TV ditched by a neighbor after a series of power glitches overnight on the local power line in my area. The TV power supply died, so he had to dump it to the curbe side. It is now serving me well after repair. I always cut the shack power to avoid this type of misfortune with my shack equipment. Guess i am that guy from the "tiny minority" ut so far that practice has served me well. |
| james_s:
--- Quote from: Mr. Scram on July 18, 2019, 04:24:42 pm ---Even if the graceful shutdown were an excuse not being able to turn off the screen or fan is inexcusable. --- End quote --- Can we confirm that they all behave this way? Because if I encountered this I would assume it was a defect, shorted transistor driving that power rail for example. |
| rsjsouza:
--- Quote from: Mr. Scram on July 18, 2019, 04:24:42 pm ---Even if the graceful shutdown were an excuse not being able to turn off the screen or fan is inexcusable. --- End quote --- I agree this is shameful. However, it doesn't detract from where it matters the most: when the power supply is actually turned on. --- Quote from: james_s on July 18, 2019, 07:35:46 pm ---Can we confirm that they all behave this way? Because if I encountered this I would assume it was a defect, shorted transistor driving that power rail for example. --- End quote --- There were several EEVBloggers that sent their units back to Keysight for a recall (myself included) and the exchanged units presented the same behaviour. |
| magic:
--- Quote from: SiliconWizard on July 18, 2019, 03:57:41 pm ---I'd say that a device equipped with such "soft" on/off button should NOT power on by itself in case of mains power cycling. Sounds like bad design and not something completely inherent to soft power buttons (but obviously with a simple mechanical switch, it can't happen.) --- End quote --- They probably wanted to make it power up instantly when it is turned on with the mechanical switch. Otherwise somebody would inevitably return it as DOA :P |
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