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  1. (*steve*)

    Boxing day sales!

    Well, the good news is that the transformer was connected between neutral and ground (assuming the genius who wired this has their house wiring correct). It also explains the very well blown fuse. Unfortunately the primary seems to be open. Also looks to be a 127V winding :-( And the power...
  2. (*steve*)

    Boxing day sales!

    Santa arrived late this year. He left me this This scope has a massive bandwidth of... wait for it... 500kHz! But it makes up for that with a vertical sensitivity of 100μV/div. Inside it looks like this But the power connection is a little suspect... The mains flex just comes in...
  3. (*steve*)

    Boxing day sales!

    I think i got a "going to a good home" price.
  4. (*steve*)

    Inductor Coil Testing

    A coil's resonant frequency is where the reactance due to inductance is matched by the capacitance between the windings. it is the point at which it effectively becomes more capacitive than inductive with increasing frequency. You shouldn't plan to use any inductor near it's self resonant...
  5. (*steve*)

    Boxing day sales!

    It looks like the box of parts has a large quantity of unobtanium in it. Including even more valves, shields, if transformers, coils, knobs, screws, etc...
  6. (*steve*)

    Boxing day sales!

    Well, I went shopping with the money Santa left me (the money my wife didn't spend on gifts ). I saw a nice Racal receiver (it looked small in the photos). So off I went. I ended up with a Racal RA17L Oh, and also a Racal RA117 And also another RA117 for parts Not to mention a pair...
  7. (*steve*)

    Stage Line 500W amp repair project

    At the very least I'm going to have to go back and read the thread again. Unfortunately I'm not in a position to do that right away.
  8. (*steve*)

    Stage Line 500W amp repair project

    That's a good start :-)
  9. (*steve*)

    Siemens functionmeter b1081 - manual?

    That appears to be correct. I'll contact them. Thanks
  10. (*steve*)

    Siemens functionmeter b1081 - manual?

    This seems to be something that measures both voltage and current to calculate power, but it seems to have a stack of complexity. Does anyone have a manual? I have not been able to locate one.
  11. (*steve*)

    Stage Line 500W amp repair project

    We're still here to help :-)
  12. (*steve*)

    Which proximity sensor can be implemented from inside of a metal body or casing?

    Charge the metal box up to a potential that can jump 10 cm. then detect the sound of a scream. the sound should penetrate the box.
  13. (*steve*)

    can I have some help with measuring hz of an osc with a multimeter

    Oddly, I'm not surprised.
  14. (*steve*)

    can I have some help with measuring hz of an osc with a multimeter

    You should speak to a couple of the old timers here. They will regale you with stories of real quality nonsense. Aaah, I remember the days... I particularly remember one person whose avatar I changed to an image of the character Maxwell Smart, Agent 86, a bumbling spy in a late 1960s comedy.
  15. (*steve*)

    Higher than rating capacitance

    If your capacitor has very high leakage, capacitance meters that use the time taken for the capacitor to charge to a certain voltage from a constant current source (or variations of that) will read a higher capacitance because they mistake the leakage of energy from the capacitor as increased...
  16. (*steve*)

    Anybody else watching the USA election results?

    Looks like a knife edge in a series of deciding states.
  17. (*steve*)

    48V.

    Technically, the difference is 96 volts.
  18. (*steve*)

    Analog frequency meter

    The meter you have may be marked in Hz, but that doesn't mean it directly measures frequency (e.g. consider a meter with a scale of litres/minute - you wouldn't pour water into it) An analog frequency meter is often driven by a circuit that converts a frequency to a voltage. One way of doing...
  19. (*steve*)

    Unbalanced super capacitors in series

    Yes, if one had higher leakage than the other, the charge will be slowly shifted from one to the other. There are multiple methods of balancing supet capacitors in series. I'm sure you will find several as you look. They can be as simple as resistors across the capacitors, or zener diodes in...
  20. (*steve*)

    Replace SRAM with faster/slower? Duplicating bios flash...

    Yeah, nS is nano-Siemens And that's a derived unit equivalent to kg−1⋅m−2⋅s3⋅A2
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