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  1. Things you need to know about the new ‘Conversations’ PM system:

    a) DO NOT REPLY TO THE NOTIFICATION EMAIL! I get them, not the intended recipient. I get a lot of them and I do not want them! It is just a notification, log into the site and reply from there.

    b) To delete old conversations use the ‘Leave conversation’ option. This is just delete by another name.
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Keeping amused

Discussion in 'd.i.y.' started by PigletsDad, Jul 12, 2022.

  1. russel

    russel ./_dazed_and_confused

    martin clark likes this.
  2. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

  3. russel

    russel ./_dazed_and_confused

    PigletsDad likes this.
  4. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    OK it opens in Firefox but not in Chrome here... weird...
     
  5. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    russel and martin clark like this.
  6. PigletsDad

    PigletsDad My intelligence test came back negative.

    PSU intermodulation gives sideboards 100Hz either side of main signal. Simple example is say 1kHz sine wave on the edge of clipping. As supply voltage falls, top of wave clips, but after each mains peak voltage rises and takes stage out of clipping.

    Perfectly possible to have little mains breakthrough at 100Hz in a symmetrical design, but much more energy in sideboards. Conventional bridge based THD will underestimate it, but shows up clear in FFT.
     
    Last edited: Sep 17, 2022

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