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    what does this do?

    Cannot say "what" it is but can say it is made up of 120v mains components so take care there. Leads come and go from the "box" so can be dangerous in no uncertain terms. Transformer appears to run on Blk-common and White-120v for the primary with the 208 and 240 wires terminated. Cannot see...
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    Just need a "simple" question answered around something I'm designing it's mechanical in nature but confident there are people who may be able to help

    Wiki will have reference to all your queries I am sure.
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    circuit breaker alarm

    See the forum covering mains loss alarm........section from Ralph Bacon in particular.
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    Power failure alarm

    It is quite feasible to do with a contact free arrangement so therefore no mains intrusion, and an Arduino. Advantage of the Arduino is it can be put to sleep and draw very little current until it is woken up, obviously by a change of state of the detector. The detector will naturally draw some...
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    What microcontroller is used in the car key? Why is the power consumption so low?

    Buy one for a couple of dollars........... remote switch.....can be up to several relay channels if needed. Besides, not enough to know what kind of micro might be involved as you would need to write and upload the required program among other things. If you have to ask as above, I'm guessing...
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    want to tinker with my UPS.....

    Solar panel output characteristics are obtained using the short circuit method.
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    Relay LED Optocoupler Circuit

    Don't follow your logic ........ as I said, the opto output is open collector. What is the "high" level in terms of voltage? What happens if you disconnect R13? What type number is the opto? You might be getting yourself all bamboozeled by the type of opto you are using.(Base opto diode)
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    Relay LED Optocoupler Circuit

    Show the rest of the circuit for the LEDs. The opto is open collector. What are the LED specs?
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    Comelit Intercom Troubleshoot/Repair Help

    Faults you'll usually find in power supply or any physical switches. Speakers and mics can be tested with an everyday multimeter. Details would be on youtube.
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    Molex crimping & crimping tool (beginner questions)

    Better for you if you use the prefitted plugs/sockets. https://www.aliexpress.com/item/1005006026069729.html
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    Paper Shredder problem

    Correct......so one or more of the diodes in the bridge are faulty. Remove and test.
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    Pioneer SX-850 - No power, lights. Blown fuse at FU4

    Doesn't look like a 150w incandescent lamp to me.......... However, start by checking all the voltages as shown on page 11 "block diagram". Watch you use the correct voltage reference point.
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    Touch pad not behaving!!

    If you or one of your mates is proficient with soldering etc. you might like to try adding a small twin cable across the on-board contact for the operation in question, bring out to the outer case and add a single small push button tactile switch. It is possible to get these tactile switches in...
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    Do I need a constant current or voltage power supply to drive 12V Halogen lights?

    Led driver not made for Halogen lights which do not require either constant voltage or constant current. Halogen lights are a thing of the past, wayyyyy too much heat dissipation. It might work though, as they say , suck it and see. Can only cook itself. I'd be buying a couple of LED lights...
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    Inverter fan question

    You have other problems within.
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    Pioneer SX-850 - No power, lights. Blown fuse at FU4

    Best you try to find a circuit diagram and go from there. People in the know will have some idea on where to trace any fault with the device in front of them however the device is in front of you hence the first hurdle.
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    Touch pad not behaving!!

    Pretty sure you missed #7 point.....try reading it again. Halold also made the point about "multiple switching" or contact bounce" which would be inaccessible to fix/access in a modern day design.
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    EBCF-127-120V-LPF

    Think you'll find they are not made any longer. Best (and more than likely much cheaper) to move on, buy a new complete fitting.
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    Where to start/post project to do with my grandson

    talkingelectronics have more information, theory and basics circuits than you can poke a stick at. (all free...books as well) https://www.talkingelectronics.com/te_interactive_index.html
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    How about hot steam for unsoldering (more effective than heat gun?)

    Not practical one would think given the processes and the equipment needed to get to the required temperatures. Again not practical given the costs involved with manufacture and certification of the steam generator device and associated equipment. .............so, back to the heat gun. Someone...
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