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  1. (*steve*)

    cheat sheets

    I'm expecting more gems of misinformation.
  2. (*steve*)

    Health Care is so damn expensive...

    If I were without health insurance, I may have had to wait for 6 months on a waiting list for the surgery I've just had. Surgery that I put off for 2 years anyway. On the other hand, it would have been available free of charge aside from some pharmaceuticals. In my case there was an extra...
  3. (*steve*)

    Question about a bluetooth headphone battery.

    That little board is probably battery management. If the new one doesn't have something similar (it may just be the bare battery) then you'll have to transfer it across too. The new one may have a simpler board that only limits max charge and discharge. The older one seems more complex than...
  4. (*steve*)

    Encoder causing "ghosting" in button matrix

    Oh, sorry, I misread that as one encoder with the odd behavior and that the side effects followed it. But if you have encoders of the same type that don't operate the same it's hard to escape that there is a fault with more than just your understanding.
  5. (*steve*)

    Best way to reducing voltage

    There's nothing magic about SMD. The same components are available. A low dropout 3.3V regulator would probably work for you. If the chip can operate down to 2.7V then the whole circuit will probably run until the battery voltage drops to 2.8V (which is considered "flat" for lipo). You can...
  6. (*steve*)

    Health Care is so damn expensive...

    Can I take the time to complain? First, let me say that I'm late in my working career and health Care is probably about as expensive as it's going to get for me. I (and my wife) have a number of conditions, and we fall outside any income, employment, or age related criteria which would lessen...
  7. (*steve*)

    What battery do I need for these LED bulbs?

    And obviously one would normally expect red to be positive and black negative. And I assume you're checking one at a time, not dirt chasing them together (which won't work)
  8. (*steve*)

    What battery do I need for these LED bulbs?

    It sounds like those are LEDs with a resistor wired in series with them so they will operate at between 9 and 12V at their nominal brightness (a very wide range by the way -- it suggests they are sticking any of resistor near the right value in there). The problem is that a reverse voltage as...
  9. (*steve*)

    Ardiuno voltages - Beginner

    No, I think they recommend 7 to 12V with 6 to 20 bring acceptable (check that though) At higher voltages the regulator will get quite hot.
  10. (*steve*)

    Ardiuno voltages - Beginner

    Isn't the Uno 5V? One input (the lower one) is the voltage the microcontroller runs from. You must supply the correct voltage here. The other one (the higher one) is an input to a voltage regulator. This will provide the lower voltage to for the microcontroller from a less accurate but...
  11. (*steve*)

    Correct name for push button switch

    Probably much cheaper to purchase a DPDT momentary contact switch and just use the contacts you need.
  12. (*steve*)

    ID Obsolete Motorola Communications Capacitors?

    Sorry, I posted my response without reading too closely who posted it. *Blush* Maybe I will edit it back to a couple of lines :-D
  13. (*steve*)

    Connection knowledge

    You still haven't answered whether it is working now or not. If it is then: you are fortunate that transistors will show some gain with the collector and emitter reversed, but they won't like a voltage across them higher than about 8V You have misidentified the collector and emitter. If it's...
  14. (*steve*)

    Finding a good soldering iron....

    I hate the expression "solder flows toward the heat". Solder isn't possessed of some heat-seeking anti-gravity magic. Solder flows on surfaces it can "wet", when it is hot enough to remain molten, and within the constraints of gravity, its viscosity and shape of its meniscus. Sure, that's not...
  15. (*steve*)

    Is this schematic correct?

    Ok so now you have a known good transformer and a circuit of unknown provenance. If nothing happens, try swapping pins 1 and 2. If it still doesn't work then you will need to very carefully follow our instructions for troubleshooting.
  16. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    I'm not going to do all your homework for you. You know how the circuit works now, you should be able to do it yourself.
  17. (*steve*)

    Encoder causing "ghosting" in button matrix

    It sounds to me that one of your rotary encoders is faulty. Afaik you shouldn't get unbroken continuity between 2 pins of an encoder while it is being rotated.
  18. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Well, if you wanted to describe T201a as common base you could, but all that would do is confuse you. These are transistors designed for switching. Common base configuration is used as a current buffer or voltage amplifier. Here it is used as a switch when one voltage rises significantly...
  19. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    To enable Vbe of the left T201 to be at about 0.6V. The transistors would be better named as T201a and T201b then.
  20. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    When I refer to T201 I refer to the one on the left. At about 7V on TM+ both outputs will fall to zero.
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