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    Relay or MosFet to switch a 12V signal?

    You are going to have 12V on your output regardless of the position of your switch. In about 4 hours I will be at work with several schematics for what might work for you - unless someone else answers you first.
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    Deskfan switch failure

    Welcome to the forum. The first thing I always do when there is switch trouble is to clean it with contact cleaner. Since this is an appliance connected to the AC line, always unplug it, spray the switch, turn or slide the switch through all of its positions, then wait at least 10 or 15 minutes...
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    Bang & Olufsen beomaster 2400 relay

    NO! Don't do that! In all the years I spent repairing stereos, only once - or twice - the protection circuit was at fault. Otherwise, it's doing its job detecting an over-current condition. Bypassing it can toast the power supply section or one of the channels. You need to take measurements to...
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    Bang & Olufsen beomaster 2400 relay

    Welcome to the forum. It sounds like the protection circuit is shutting down the receiver. Disconnect the speakers, turn the volume all the way down and turn it on. If it still clicks, it sounds like the problem is internal. If it doesn't click, check for shorted speaker wires or a speaker itself.
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    Wanted: electrical ferrules

    Welcome to the forum. Maybe this will help: https://www.electronicspoint.com/forums/threads/how-do-you-add-components-with-thick-leads-to-a-breadboarded-circuit.3625/
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    LIFE FITNESS TREADMILL'S MOTOR CONTROL BOARD DISPLAYING NOTIFY MAINTENANCE

    Welcome to the forum. https://www.manualslib.com/manual/870329/Lifefitness-9100.html?page=16
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    Small variable power supply.

    Welcome to the forum. According to this review, it is a good PS. https://oscarliang.com/toolkitrc-p200/
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    Help with finding equivalent Operational Amplifier from AD converter

    I thought this was the original you are trying to replace.
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    Help with finding equivalent Operational Amplifier from AD converter

    https://www.ebay.co.uk/itm/5PC-C812C-UPC812C-operational-amplifier-IC-/264735677249
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    Bulk power supply LY6806 based

    Personally, before I spent the effort altering circuitry, I would just use a diode in series with the output. It will drop about 0.6V so you would need to set the PS to about 3.9V to get 3.3V out. I would also add an electrolytic after the diode to keep the impedance low.
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    Bulk power supply LY6806 based

    Welcome to the forum. Here is a knockoff of your power supply. At this price it is hardly worth trying to fix it. https://www.aliexpress.com/i/4000123709435.html
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    Weller EC1201P rebuild

    Welcome to the forum. I gave up on Weller years ago. The cost of replacement parts are more expensive than a cheap soldering station. If it needs more than a new tip or an internal fuse, I'll throw it away and buy another. The one I have now is many years old.
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    Dewalt DCB101 bad transitor

    Amost no one has these, except here: https://www.arrow.com/en/products/ipp60r299cpxksa1/infineon-technologies-ag?utm_medium=aggregator&region=nac&utm_source=findchips&utm_campaign=arrow_2021&utm_content=bnl_2
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    NOS KDS XF-9I CRT, geometry issues

    Welcome to the forum - although a month ago! I would try spraying all the switches and controls, even the internal pots on the circuit board, with contact cleaner. I don't know where it was stored but I had a perfectly good guitar amp that sat in my cellar for only about a year and I had to...
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    Seeking Front Panel Silkscreen Alternatives

    I use this stuff often. Great for metal and plastic enclosures and looks best when printed in color. Different types available: clear, frosted, etc. https://www.rayven.com/reprofilm.php
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    12v DC Doorbell Chime

    Use a wireless doorbell. We have one with a receiver that plugs into an outlet. Very long range.
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    MS-3 Wireless headphone issue

    Welcome to the forum. On your other headphones, spray the pot with contact cleaner. There is an opening where the pins come out. On this one you can test the pot with an ohmmeter to make sure the resistance rises and falls from the center terminal to each edge terminal.
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    Reloading powder check

    I used to be a reloader myself. Mostly 9mm. Personally I'd stay away from a gizmo like this. Electricity can cause sparks. One spark and you lost your face. What's too hard about just using your eyes?
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    Knightkit 400(A) or Lafayette TE-15 Assembly/Maintenence Manual

    https://www.lost-manuals.com/manufacturer/Lafayette/TE-15
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    Repair stereo transformer ~ possible?

    Welcome to the forum. If you can, remove the shell on the white wire side. You may be lucky and find a fuse inside.
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