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    Price versus quality

    :) Thanks everyone. danadak - that is a dudely suggestion, for which I thank you very much. Whoof! My old trade of circuit board electronics has gone through such a set of revolutions... I hardly know a thing about what people are actually doing. I would never have discovered danadak's board...
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    Price versus quality

    Thanks danadak. 10 bits of precision is very good. Edit: And it is waaay cheaper than the equivalent pot! Thanks Mark
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    Transistor Price Question

    Wooh + shock emoji What's their job in your cct?
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    Price versus quality

    You are quite right. However, given that I might want excellent results, what's the best available pot? (I don't believe that price is always a reliable indicator of quality.) I would like to set my e.g. 1k pot to e.g. 500 Ohms, then reset to say 800 Ohms, then go back to 499 Ohms, without...
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    Price versus quality

    Hi Peeps :) I need to set an analogue voltage to a very fine adjustment. I've been window shopping at Mouser, and Radio Spares, and wherever else I can find good potentiometers for sale. There are many, many pots on sale - and at some amazing prices - a single turn linear pot can cost a couple...
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    Wanted: optics parts from video projector

    Thinky, thinky... I'm thinking that BS2 in Delta Prime's drawing ought be a non-polarising beam splitting prism, so that I obtain a long, parallel interference path, or prism of light in free space, within which to place my detectors.
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    Wanted: optics parts from video projector

    . Thank you very much, Delta Prime. It's essential to wear such eye protection, even when working with very low power lasers, isn't it. Laser related eye damage is accumulative. I admit it... I feel very reasonably afraid of lasers... not quite as afraid as in the case of self-surgery, but...
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    Wanted: optics parts from video projector

    Well, well. Sounds simple as a limit theorem to me. So QED has become part of my life (surprise emoji). Long, slow stuff, QED, by all reports. As for getting started, I found a cheap, dead handymans laser and it's on the bench now. It's a TUF brand green laser with 2 output lenses arranged in a...
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    Wanted: optics parts from video projector

    Looks like Delta Prime is living a double life... but perhaps The Boss might have a window into his secrets. :)I like the MZ interferometer better than the Michelson because there is no need for an ($) optical isolator.
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    Wanted: optics parts from video projector

    :) Hi! to all readers. I now have a 532nm semiconductor laser. With my laser, and parts from the video projector, and some kind of solid table, I can make a modified Mach Zehnder interferometer to measure my tiny displacements. So... smiles - but I also have some misgivings about the thread...
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    is installing a step down transformer a diy project?

    Hi noquacks:) The power supply correction you say you require can be made using a Variac, or adjustable autotransformer. For a 1kW Variac you might pay $500 or so I guess. Mark
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    Backyard DIY Auto Repair and Backyard DIY Electronics Repair

    :) Hi Lots of modern consumer electronics and household equipment has a design lifetime of 2 years. Computers, unlike most consumer electronics are modular and can often be repaired, but computer repairs might be a separate trade, really. It's not electronics. And sadly most other stuff is just...
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    Backyard DIY Auto Repair and Backyard DIY Electronics Repair

    Some people find, in the end, that this "Humanity" we want to serve is best served through kindness and care :)
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    A Simple Reliable Topology to Demodulate an AM DSB-SC Signal

    I think you might do well to study the theory of modulation. It's been a good while for me but I am sure if this - a "parallel" AM signal is inevitably generated in the process of frequency modulation. Filters are employed to clean such things up. ... BTW I'd better declare that I have not fully...
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    Designing Active Cell Balancer using STM-32

    Hi :) ... I'm just curious - It sounds as though these "active cell balancers" have a separate charge circuit for each cell, while the cells can also be connected into a higher voltage series arrangement. Is that about right?
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    Backyard DIY Auto Repair and Backyard DIY Electronics Repair

    Hi all :) I admit that my (historic) excellent understanding of what goes on in electronic circuits couldn't have been gained without a solid understanding of higher maths. Engineering maths isn't simple. In practice I hardly needed this understanding as a working bench technician. Practical...
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    A Simple Reliable Topology to Demodulate an AM DSB-SC Signal

    Hi :) I'm amazed, and will nominate you for the Inner Circle if you can make a real one work.
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    Backyard DIY Auto Repair and Backyard DIY Electronics Repair

    Can your question be verbally answered in any way satisfactory to you? The answer you seek can only be found in trying to do the work you wonder whether you can do. We can best help with specific technical problems that you encounter while doing electronics.
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    Backyard DIY Auto Repair and Backyard DIY Electronics Repair

    No it does not take "more" than the curious and adventurous mind that you've obviously got. :)
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    Backyard DIY Auto Repair and Backyard DIY Electronics Repair

    Hi :) One thing I find very difficult to predict is how good someone's going to be at finding faults. You might just need to get a really good understanding of electricity. Do you have any teaching/training resources available in your area?
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