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  1. Hero999

    power problem

    I'm sure you ca  figure this out for yourself. Hint: the floating ground behaves like a 6V voltage source, in series with two 4k7 resistors connected in parallel.
  2. Hero999

    Simulation of 12-Watt Amp Help

    Why do you have what looks like a current source and voltage source connected in parallel? It will inject 2A into the voltage source so the ammeter's reading will be equal to the amplifier's total current consumption (which is almost nothing when there's no signal) minus 2A. Is the 10R...
  3. Hero999

    simulation help needed

    What do you mean by link the program together?
  4. Hero999

    Need help for SEPIC Converter

    How are we supposed to help you with the #pcb when you haven't posted the layout or a photograph? Is the PCB layout similar to that given on the datasheet?
  5. Hero999

    Need help for SEPIC Converter

    What I meant was are you sure the models used are accurate? For example, have you included the ESR of the inductors and capacitors? If the the answer is no, then your simulation is wrong.
  6. Hero999

    Need help for SEPIC Converter

    Good, you've realised you won't get any help, unless you give enough information. Are you sure the simulation is accurate? Have you assumed ideal components? What about the PCB (which again you've not posted so we don't know)? Is it correct. Have you followed the layout recommendations of the...
  7. Hero999

    Need help for SEPIC Converter

    Apart from the fact, the circuit is wrong, you need to change C1 from an electrolytic to ceramic capacitor.
  8. Hero999

    3 Phase Bridge Rectifier

    The recovery time is the only thing you need to be wary of. At 400Hz it shouldn't be too much of a problem. The power dissipated at 400Hz would be slightly higher than it wouls be at 60Hz. I'd advise selecting a part with a higher current rating than you need, go for 25A or 30A.
  9. Hero999

    measure a voltage across of a dc motor

    Firstly, why are you using a power op-amp to simply drive a motor? It seems like a bizarre thing to do. A single transistor would be much cheaper and more efficient. Are you even sure the op-amp can supply enough current to power the motor? You're right about the formula to calculate the RMS...
  10. Hero999

    can't open attachment

    When the server went down a couple of years ago, lots of old attachments went missing and the administrator couldn't retrieve them from the backup. Sorry, there's nothing I can do about it.
  11. Hero999

    can't open attachment

    How old is it? Some old attachments have been lost. Please post a link to the post.
  12. Hero999

    a microprocessor transistor hFE tester

    What do you need help with? Please post your work so far.
  13. Hero999

    simulation help needed

    It works for me under Windows XP 32-bit. Simply extract all the files to the same folder and run ECD.EXE This is an old DOS program so won't work with the newer versions of Windows (Vista, Windows XP 64-bit or Windows 7) but it should work under an emulator such as DOSBox.
  14. Hero999

    force limit a motor

    It's fairly straightforward with a DC motor or AC motor. The motor's impedance reduces (therefore drawing more current) as the mechanical load increases. A current limit could be used to restrict the torque or detect the shaft being jammed. I don't know about a stepper motor. I think using a DC...
  15. Hero999

    simulation help needed

    Please post a link to the software you're having difficulty with.
  16. Hero999

    Full sound bar schmatic/BOM

    If you want to attach a file, please upload it here, rather than over there. Don't worry too much about viruses, audioguru. Opening a zip file is a fairly low risk activity, far safer than installing software or even viewing a Word document. Even if it does contain a virus which isn't detected...
  17. Hero999

    Switching a 240v supply safely .. need advice/help?

    It's probably too late the original poster but hopefully others will still be reading this. You can buy USB controlled power saving plugs. Perhaps you could use an MCU to control one via USB...
  18. Hero999

    Personal Project With Lights & Settings

    Oh I misread it. What  mean I mean is why do you need to store energy? The 12V battery is still there right? All that  needs to be done is not switch the light directly. The light could be connected via the control system (microcontroller and transistor/relays) which is permanently connected...
  19. Hero999

    Adding led brake lights

    Forgive me for butting in, I've not had time to read the entire thread. I notice there are lots of LEDs connected in parallel; why? It's more efficient to connect them as three strings of five or even five of three. If all this does is buffer the PWM signal then why use an op-amp IC? A...
  20. Hero999

    Personal Project With Lights & Settings

    What do you mean by reverse energy? It can be done with a simple microcontroller, which is basically a very simple computer on a single chip, that can be programmed to do a variety of different tasks. There are other ways of doing it with logic gates, transistors and relays but by the time...
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