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    Seeking advice on new iron/handle for old soldering station (thermocouple sensor type)

    The old Dick Smith Electronics (DSE) T-2000 looked very similar. They operate on 24v (not sure about your AC part though) and are 48w as far as I know. Some parts are still available but you would need to search.(expensive to boot) but they do last a long time. Stlll use one here. There are...
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    help fixing fluorescent lamp circuit

    Some one has been fiddling and has everything a-up. 2nd last photo in # 10 definitely not right. Bye bye to at least one tube heater.
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    Wagner Steam Cleaner Handle Overheating

    What do you think steam is...........???? https://www.tlv.com/en-au/steam-info/steam-theory/steam-basics/types-of-steam
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    Beginners book

    Talkingelectronics web site....more than you can poke a stick at...all free. https://www.talkingelectronics.com/te_interactive_index.html
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    help fixing fluorescent lamp circuit

    Perhaps your filter circuit is not working properly. (bad or leaky caps)
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    Marconi 4461 dial cord nightmare

    May be something here....... http://www.radiotiques.com/services.asp?Tab=Dial+Stringing Good reference for future anyhow. Plus here.......... https://www.thecodemachine.co.uk/Schematics/Search.php?manuf=Marconiphone
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    Want to make a box that will open at a programmed time.

    Being a dog, they can be quite aggressive (in a nice way) when it comes to food. I'd imagine under those circumstances that anything with a hinged lid would last about as long as it took to feed the first time. I'd be thinking more along the lines of a sliding lid like say in the olden day...
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    Using mosfet to switch 12V to a load with a hard ground.

    I'd be inclined to trace terminals 1 and 2 on the horn switch and place a standard voltage free set of relay contacts across there. That retains all the original inbuilt wiring and control mechanism without any possibility of feedback or "strange effects" which can happen when you start fooling...
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    Using mosfet to switch 12V to a load with a hard ground.

    .............why?
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    Using mosfet to switch 12V to a load with a hard ground.

    I doubt your expected circuit is correct. Auto wiring to the horn (and other equipment) is normally earth return. i.e. power is applied to the horn (or other equipment) and the ground is taken to the slipring on the steering wheel. Those that use a relay would be similar.
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    My speakers stopped working

    $25 for a replacement...hardly worth the effort of getting out any repair tools.
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    My speakers stopped working

    Working on smps require quite a bit of knowledge in that area along with an amount of testing equipment. You don't say what you have let alone whether you have a circuit diagram or not and whether or not you can read and apply a circuit diagram. The latter would be essential. What voltage is...
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    Calculate the transfer function of an OPAMP circuit

    Are you sure about that as it would depend on the type of hall effect used.
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    500VDC/20A static IGBT switch high side gate driver with charge pump - 3.3V Vcc

    I don't see any need for a driver other than whether or not the specs for your particular device is rated for 3v3 logic level. Couldn't see any spec sheet on Google for your quoted device.
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    Recharge vape battery?

    Looks a bit puffy....no temperature cut out or bms. Use with a great deal of caution. Also be aware there are the genuine Imax and clone variation........not the same.
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    Revamping my Kenwood speakers

    Think you'll find the Op is quoting the speaker impedance, usually written on the speaker housing.
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    Feather M4 Express + PropMaker Wings + WS2812b LED

    As an addition to Martaine ....... Below is an example of "good" joints.......yours are not.
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    Feather M4 Express + PropMaker Wings + WS2812b LED

    draw a complete circuit of what you have and include power supply.
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    Building a linear 5v 5a powersupply for Raspberry pi streamer build.

    Online 5v 6a for less than $20...sw mode. https://www.ebay.com.au/itm/112843990043
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    Revamping my Kenwood speakers

    Impedance of each is 8 ohm so same same.
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