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    PSU Silverstone ET550-G dead after thunderstorm (turned itself off)

    Might be the photo but top of cap beside D22 looks corroded also.
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    MOSFET’s dynamic state current and Arduino I/O pins

    That would be an absolute maximum and even at that is also governed by other design features. It is possible to simply drive the gate of the mosfet via an everyday transistor which in turn is driven by the uC thus avoiding any problems you imagine.
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    Flip flop - Output high, power cycle to turn back on

    Don't see that happening off a clock signal, and the short is still there by the way it looks to me in it's present state. Also this..... It will start MR at LOW and bring it HIGH until power is reset. The instant power connects, I think you will find the MR is high until the cap "sees" it...
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    Multimeter DT9205A problem

    Another drawing in the same zip(DT9205A cleaned up dot gif) shows R7 (green) non-existent and different numbering and value. i.e. shows it in place of R9 (220K)
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    Help select suitable Mosfet for driving relay.

    Yes, that was another story and if I remember that particular mob was forced to pull it's head in and issue a fix for it's deliberate actions.
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    Flip flop - Output high, power cycle to turn back on

    Sounds like a dead short to me. Diagram of before and after and what this "device" is might help.
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    Lead acid battery

    Sure does, and for only a few dollars also. Could never start to build one for that, besides I always have my time better spent on other things. Cheers.
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    Lead acid battery

    Think you will find there are a couple of different versions. You will have to check whatever module you have to be absolutely certain. This three pot version does for sure.
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    Lead acid battery

    Yes, I agree. Pretty much anything one needs to know about charging batteries can be found at Battery University. Below is a typical search within their site for charging lead acid. https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery You may want to look at how to use a...
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    Charge a battery with electromagnetic induction

    This would be a great quote for many queries in here. :)
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    Wanted: Wanted - copy of ETI magazine “Project Electronics”

    Does this help.....?? https://archive.org/details/ETIA1979/page/n61 Also at the bottom of Wiki there are some links... https://en.wikipedia.org/wiki/Electronics_Today_International
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    1000 watt zvs induction coil drawing too much when I put a crucible in it.

    Link to the items you are using...???? Basic layout drawings.
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    Help select suitable Mosfet for driving relay.

    Don't forget to common the grounds between Arduino and the 12v supply.
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    Vehicle Wiring: Actuation Speed Sensing on SPST Switch

    http://www.talkingelectronics.com/te_interactive_index.html Look for free book on 50 555 circuits. Then go back to the previous suggestion, draw up a truth table and look at Arduino.
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    MOV blown on NiMH 4xAA cell charger - cause?

    Maybe the back door slammed shut and knocked the plug out of the wall socket.
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    Dehumidifer - Does not Power On. Faulty Power Supply Board.

    Firstly a word of warning. High voltages in here AC mains and over 300V dc. After power down, discharge any large caps with a 1K5 5W resistor. If you are unsure, get it to a repairer. TV tech should know what to do. It's a small smps . The first 3 items fail is fairly typical of a power surge...
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    Vehicle Wiring: Actuation Speed Sensing on SPST Switch

    Make up a truth table, learn how to program an Arduino and go for it. Could be problems with whatever vehicle registration /insurance you have to deal with though when they find out about illegal/un-certified mods.
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    Help select suitable Mosfet for driving relay.

    To avoid the problems selecting the right base resistor and the transistor getting cooked perhaps...?? If you decide to go with a mosfet, don't forget the gate to ground 10K resistor.
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    Help select suitable Mosfet for driving relay.

    No, not asking about pulsing, 1K0 may be too high on 5v. I'd normally use 330R just to make sure it's hard on.
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    help wiring 3 phase washing machine motor

    Also seen one used in the primary jaw drive in a rock crusher. (70HP with resistor bank)) Use of it had many advantages which included being able to literally be able to "rock" the motor by start -stop to clear a large bolder. Crude I know but it worked for many years until someone "smarter"...
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