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  1. (*steve*)

    The corona. What's the latest?

    I would not put a lot of faith in that article.
  2. (*steve*)

    Chasing down excessive power consumption

    Or, in this case, going to. You could just turn them off and see what stops. If you still can't figure it out then that's a great reason to get a sparkie out to figure it out for you.
  3. (*steve*)

    Transistor series voltage regulator

    Well, "emitter follower" describes the function, and "common collector" describes the topology of the same thing. When I was learning this stuff, I found it easier to picture it in my head as "common collector" and remember the characteristics. But I'll concede that in this case, describing...
  4. (*steve*)

    Transistor series voltage regulator

    I like to think of this as a common collector amplifier. The input signal in the base caused a slightly lower voltage to appear at the collector, but this output can supply much more current than is drawn from the input source. Your circuit is not conventionally drawn as a common collector...
  5. (*steve*)

    Jumper Wires and Breadboards

    I've got a number from China and I've not had any particular problems with them. Tinned solid core insulated copper wire works just fine and is really cheap. I used bits of wire from phone cables, and later cat-5 cable; both of these are pretty much free.
  6. (*steve*)

    Stereo Receiver Right Channel Distortion.

    It probably should be an 82Ω resistor, don't worry that is a common value. I'm not sure what power rating you should use. Try to get a metal film resistor of the similar (or larger) dimensions. Also, follow the recommendations you've received earlier in this thread about things to do.
  7. (*steve*)

    Stereo Receiver Right Channel Distortion.

    Well, it is an indication of the sort of overload that could cause an output transistor to fail. They normally fail short circuit, and that may have lead to the failure of this resistor. I also didn't notice a discoloration of the board that might indicate the resistor was running very hot for...
  8. (*steve*)

    Stereo Receiver Right Channel Distortion.

    OK, so you could replace the resistor, but it will most likely get hot and burn out again. (or there may have been a short with Q210R, and it has magically survived). If it does, then we can search nearby for the faulty component. Did anyone short the speaker terminals by accident? Or play...
  9. (*steve*)

    12VDC Battery Backup Switch - Mini UPS DIY

    1) the 10A controller could try to draw 10A (or even more) from your 5A power supply. That's not good. 2) a 4AH battery is very low in capacity, are you sure the PWM controller will work with such a small battery? It may try to charge it too fast. 3) A 1.5 ohm 10W resistor in series with the...
  10. (*steve*)

    Comedy Thread

    That's fine. In the southern hemisphere the top of the pot needs to face south. edit: actually, some argue that in the southern hemisphere the bottom should face north. But usually either is OK.
  11. (*steve*)

    12VDC Battery Backup Switch - Mini UPS DIY

    That may well work as long as the battery is the correct type and capacity for the charge controller. If you plan to connect your current 12V DC supply to the charge controller, be aware that solar charge controllers work on the basis that the power source is current limited. They can easily...
  12. (*steve*)

    And now something weird

    I believe they assist you in dancing.
  13. (*steve*)

    Stereo Receiver Right Channel Distortion.

    Where is R223R in your images?
  14. (*steve*)

    Fly back converter

    This is a switch mode power supply. The mosfet turns on and off rapidly, controlled by the optocoupler and the transistor to maintain the output voltage (24V) between fairly tight limits. An additional three terminal regulator provides an auxillary 12V output that is probably only capable of...
  15. (*steve*)

    12VDC Battery Backup Switch - Mini UPS DIY

    You can use a pair of diodes to isolate both supplies from each other. That way, if the mains 12V fails, the battery will take over. However, this requires that the battery has a slightly lower voltage than the mains adapter. A far better approach is to have the 12V battery permanently...
  16. (*steve*)

    Is there any risk of shock from attaching or detaching wires to a 9V battery?

    Not another silly EMP thread!
  17. (*steve*)

    COVID-19

    Yes, much later, indicating that the spread had been controlled somewhat (linear, or better growth rates vs exponential). Keep an eye on India, Brazil, and parts of the US that are still (or again) in an exponential trajectory. India and Brazil have a younger population than the US, so I would...
  18. (*steve*)

    Comedy Thread

    Your wife is your father?!?! (Very progressive!)
  19. (*steve*)

    Questions conserve game console

    Do nothing. Especially don't ask us questions.
  20. (*steve*)

    Questions conserve game console

    Unless you place the entire box in an airtight enclosure, no amount of desiccant will absorb moisture for long. The idea is that you seal up the device and the desiccant removes any moisture present when it was sealed. Using an unsealed enclosure means you'll be wasting your time putting...
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