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  1. (*steve*)

    How to make this circuit unity gain?

    A note for @AFex54, this means electrically, not physically :-)
  2. (*steve*)

    PUPS Problems with Uninterruptible Power Supply

    It's a laptop. (Yeah, and it might operate from something like 19V)
  3. (*steve*)

    PUPS Problems with Uninterruptible Power Supply

    Most PC power supplies directly rectify the mains. This makes it possible to feed them with an appropriate DC voltage. If there is a range of input voltages that this power supply is rated for, then 1.4 times the rated AC would be there range of DC voltages. HOWEVER: Some power supplies...
  4. (*steve*)

    PUPS Problems with Uninterruptible Power Supply

    Your PC may run from DC, many PC power supplies can.
  5. (*steve*)

    Help how create schematic diagram of 94 volts output

    How about 63 AA batteries in series? What is the maximum current you require? Other details... Line and/or load regulation? Maximum ripple? Noise specs? How should it handle overload? Variable current limit?
  6. (*steve*)

    Triac Problem

    A Samsung charger is likely to be a switch mode device, and as such it may be very similar to a LED bulb. At this point we haven't established whether the problem is due to leakage or false triggering of the TRIAC. I have checked and these TRIACs are sensitive gate devices, so false triggering...
  7. (*steve*)

    Need help with Nakamichi AV-1

    There some component there which looks to have died, leaving stuff on the PCB. The PCB looks damaged below it, but it's hard to tell. What does the other side of the PCB look like?
  8. (*steve*)

    Need help with Nakamichi AV-1

    Some PCB materials darken with temperatures that are not excessive. If there's chatting of the board then that's a different issue. Have you measured the output voltage of these regulators? Do you get any audio output? Is there a headphone jack for example?
  9. (*steve*)

    Help me understand a 12V SLA charging circuit.

    Not necessarily. At 48mA the relay has 10.8V across it. The spec allows up to 130% of the nominal voltage (9V in this case), so anything up to 11.4V would be within the specified limits.
  10. (*steve*)

    Help me understand a 12V SLA charging circuit.

    I have been looking at this thread for some time. I can see no evidence that @kellys_eye or a moderator has edited any posts. (@Buk has edited a few of his posts though) Edit: @kellys_eye modified one of his posts, but not too change a resistance value. The author of a post can edit their...
  11. (*steve*)

    Help me understand a 12V SLA charging circuit.

    No, it shows that there are 10 different coil voltages available, between 3V and 60V.
  12. (*steve*)

    SPI ADC/DAC with 8051

    Your answer is asking to me saying: A car has two doors and is red. This defines a subset of cars, not all cars. Likewise your description of an ADC describes a small subset of them.
  13. (*steve*)

    Triac Problem

    I suspect it's a LED bulb and that leakage through the TRIAC charges up a capacitor in the bulb until it turns on briefly before repeating again and again. You probably can't use a TRIAC to dim a LED bulb (especially if it's behaving how I suggest above).
  14. (*steve*)

    Buck circuit to output of solar panel

    Yes, but you'll get a lower voltage. Buck converters connected to solar panels can result in you getting less power from the panel as it attempts to draw more current than the panel can supply.
  15. (*steve*)

    Need to replace an old style Capacitor

    Andy, thanks for getting back to us, and even more thanks for the positive feedback.
  16. (*steve*)

    Triac Problem

    Is that an LED bulb? What happens if you use a regular filament bulb? What are you trying to do? Do you intend to connect something to the gate later on? Is there anything connected to the gate now? Even just a wire that's not connected to anything else?
  17. (*steve*)

    SPI ADC/DAC with 8051

    Vead, I'm not confident you understand. Your statement only makes sense if your ADC has an SPI interface, a fact that is not a given. You also used "i.e" when "e.g." would be appropriate. "e.g." tells us you are giving an example, one of many that could possibly be given. For example...
  18. (*steve*)

    Carbon film resistor?

    You might be able to use a multimeter to measure from one end of the resistor to a point nearest the break of the spiral resistance track. If you do this you may be able to estimate the value of the resistor. Even better if you can do it from both ends of the resistor. Sum the values and as a...
  19. (*steve*)

    Remote Controlled AC Outlet

    If you're talking about something that can detect when your TV gets switched off and remove power from another circuit, then yes, these exist. I've seen them advertised so "green" or "master/slave" power boards. Like this.
  20. (*steve*)

    Selection of develpoment boards

    So presumably you understand the difference between an Arduino and (say) an atmega368? Have you looked at propellor or picaxe chips?
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