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    Please explain this resistance reading

    OL means open loop. You are testing for continuity whether using ohm range or diode test range. Just what amount of "continuity" would depend on the resistance of what you are measuring. A short will normally read around 0.3 as the meter leads have some resistance. Best advice would be if...
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    Component values are unknown

    I think you need to supply a bit more info about the project as a whole.
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    Please explain this resistance reading

    You will be lucky if you have not blown your meter.
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    PWM for Servo w/o Microcontroller

    My car needs new tyres but not interested in making them myself anymore. As for the tester, it was simply a suggestion. If the Op has no interest then fine but I don't see why any suggestion I make should be poo pooed by anyone.
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    Scorched Component Can't Indentify

    Was that on the 200 ohm scale only..??
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    Make a flow switch from a hall-effect flow meter

    No.....the output of opto isolators is an open collector as shown however the opto itself is not some magical power generator. The collector, (terminal 4) would normally go to terminal 2 on the relay with the emitter (3) to ground as you have connected BUT terminal 9 of the relay would then...
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    PWM for Servo w/o Microcontroller

    There are other circuits there as well as the one I showed. You are aware these things cost about AU$1.70 on Ebay...???
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    PSU Silverstone ET550-G dead after thunderstorm (turned itself off)

    Word of warning...discharge those HV caps before sticking your fingers in there. They will hold quite a wack for a long time after being isolated from the supply. I use a 1K5 2w resistor with a couple of probes soldered to the end of 150mm extension leads.
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    Scorched Component Can't Indentify

    There may well be other problems that made the resistor cook itself in that way. However it is sometimes possible to still get a reading from a burnt resistor. Looks like the white socket on the board (CN1) might plug in to what appears as a matching white plug on the motor. Then again the...
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    Resistor issue

    You do realise that small induction motors like fan motors can be speed controlled simply by switching a capacitor in series. As an example, 60w ceiling fans use between 1,5uF and 2.5uF as a 3 speed control ( hi speed direct) Most are 2 caps in the one casing as per link below...
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    DC 9v replacement

    You will need the nameplate current rating details from the system or a link to your model specs or manual. Just any old 9v plugpack you might have laying around simply will not do.
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    Attract fish by sound, light or anything else

    2 inch "hook" works for me.
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    Scorched Component Can't Indentify

    There are plenty of online sites that will resize your images if you do not have any installed on your pc.
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    PSU Silverstone ET550-G dead after thunderstorm (turned itself off)

    So can my 2 year old grandson but I very much doubt he could go any further. Instances of corroded or bulged capacitors do happen but not as frequently as other smps problems especially those caused by power surges. There are some here that will "walk you through" any diagnostics but in this...
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    PWM for Servo w/o Microcontroller

    There is a simple 555 servo tester over at Talkingelectronics web site......... search for ..........talkingelectronics interactive .......... Make certain you search for the above as shown........ I have had instances where the web site simply searched as ....talkingelectronics ...has been...
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    PSU Silverstone ET550-G dead after thunderstorm (turned itself off)

    With almost zero electronics knowledge you may have set your starting point just a little to high.
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    Interesting circuit usb with 2 led lights with different brightness

    Take a few hours off and watch some ( at least) of the Jeremy Blum youtube videos on Arduino . Start at No.1 and work your way through. Don't be too concerned if the penny doesn't drop right off as you can go back again as many times as it takes. Thing is to watch it all first and then get a few...
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    Why relay contact stick even when power off?

    220R 630V 104 cap mov 10D471K
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    Induction hubs keeps blowing out fuse

    Take the advice given and consult a LOCAL qualified electrician who would have the knowledge of local rulings and requirements. Would be best before you do some real damage to either property or persons adjacent or at worst, burn the house down.
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    Why relay contact stick even when power off?

    https://www.ebay.com.au/itm/RC-Absorption-Snubber-Circuit-Module-Relay-Contact-Protection-Resistance-Surge/303009721546?hash=item468cc96cca:g:tmIAAOSwXF5cJIFI
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