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  1. TCSC47

    Ethics of buying electronic modules from Chinese sites?

    Hi All I buy a lot of the small pcb modules that are available directly from Chinese sites such as Banggood and Hobby King simply because they are so cheap. A few £ for something that would have cost hundreds a few years ago and I think -- "I'm sure I can do something with that!" Examples are a...
  2. TCSC47

    Selenium rectifier?

    Hi Everybody I have been trying to find the data sheet and any details available of what I believe to be a selenium bridge rectifier. The component came out of a model train controller I bought way back in 1962 (How time flies!!) here in the UK. The controller was made by Hammant and Morgan who...
  3. TCSC47

    Best op-amp for audio use?

    Hi What do people consider to be a good op-amp for use in a HiFi preamp design? Cheers
  4. TCSC47

    Analogue correlation circuit to measure water flow in a pipe?

    I think about 45 years ago I attended an Open University Summer School where one of the lecturers had made a circuit that measured the flow of water through a pipe. It did this by placing two microphones about a metre apart on a water pipe and then used some form of analogue circuitry to "cross...
  5. TCSC47

    Archiving electronics literature such as Worldradiohistory.com?

    Hi everybody. If you haven't come across it, the worldradiohistory.com site ( https://worldradiohistory.com/index.htm ) is a very large collection of old electronics magazines, books and other literature. Does anybody know if it is still receiving donations? It is certainly functioning as an...
  6. TCSC47

    Micky taking ebay sales?

    I've just had a bit of a shock at seeing a 709 op amp from the 1960's on offer for £18.99. https://www.ebay.co.uk/itm/252731626657 Surely this is a p**s take and someone just chancing their arm? Does anybody here think it will sell? I also came across clearly very old CV7049 / OA10 germanium...
  7. TCSC47

    Hi Everybody

    Hi everybody I've been a member of this forum for almost a year now, but I haven't done much posting. I am retired now after a varied career as electronics engineer and then a teacher and lecturer. My qualifications range across electrical and electronic engineering, physics, and environmental...
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