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  1. Hero999

    NPC Inverter Boost IGBT Zener Clamp

    In order to help you, we need a full schematic of your intended application.
  2. Hero999

    NPC Inverter Boost IGBT Zener Clamp

    Please provide more information.
  3. Hero999

    help neede in power supply

    You might get more help if you clearly state your requirements and said please rather than plzz which is just annoying to read.
  4. Hero999

    simulation package for power system

    LTSpice is good providing you have models for all te comopnents in the system.
  5. Hero999

    Active Bass & Tremble Controller

    How do you intend to produce the board? Are you going to be using the silk screen? If so, it's a total mess, the text overlaps the parts. If not, this doesn't matter, don't worry about it. There are some acid traps created by 90o angles but you've used such a thick trace width, it shouldn't...
  6. Hero999

    NC switch with time delay

    I don't think you've given this enough thought. Va will be short circuited to 0V. Attached is a cricuit showing how to bias a depletion mode MOSFET off, on and somewhere in-between. The MOSFET has a threshold voltage of 2.5V. 1) The MOSFET is fully one with 0V between the gate and source. 2)...
  7. Hero999

    NC switch with time delay

    I'm not sure what you're trying to say. Putting the load in series with the source rather than the drain won't help because as I said before, in order for no current to flow the gate voltage needs to be below the source, not equal to but a couple of volts below the source. Take a look at a...
  8. Hero999

    Need Cross Reference For FQU1N60C Mosfet

    The STP2N60FI looks like the closest match. The lower VGS should not be a problem, although it's not possible to be 100% sure without the schematic.
  9. Hero999

    NC switch with time delay

    The MOSFET will not fully turn off because the gate voltage ill not be negative with respect to the source, as I said earlier. Why not simply build an astable multivibrator? The only time a depletion mode MOSFET is required for switching is when it's in a solid state relay as a normally open...
  10. Hero999

    Need Cross Reference For FQU1N60C Mosfet

    As I said previously there's a problem with your substitution before you even look at the electrical specification. The package styles of the transistors you've linked to are different to the FQU1N60C which is designed to use a copper plane on the PCB as a heat sink.
  11. Hero999

    NC switch with time delay

    Yes, you're right, I got it the wrong way round but the rest of what I said is still true: a depletion mode MOSFET needs a negative voltage to be biased fully off and you haven't provided enough information.
  12. Hero999

    NC switch with time delay

    A depletion mode MOSFET is a normally open switch but it needs a negative voltage to fully turn off. I don't know whether it's suitable or not because you haven't provided enough information.
  13. Hero999

    Active Bass & Tremble Controller

    1) Yes. 2) Good, you couldn't find one so you did your own. All I can say is, providing you've used the correct footprints and allowed enough room on the PCB, there shouldn't be a problem. Please post the Eagle files zipped up.
  14. Hero999

    Need Cross Reference For FQU1N60C Mosfet

    I won't give my opinion until you give me yours. Have you read both of the datasheets yet?
  15. Hero999

    translation in french

    What are you talking about? What's Electronics Lab apart from this website? I think you've confused this place with somewhere else.
  16. Hero999

    Need Cross Reference For FQU1N60C Mosfet

    Now I've found the datasheet for you, it should be easy to figure it out. What do you think? I noticed see one obvious problem before I even looked at any of the electrical characteristics.
  17. Hero999

    Need Cross Reference For FQU1N60C Mosfet

    I've no idea because I can't find a datasheet for the P2N60FI. Finding a datasheet for the FQU1N60C was easy. I suspect you can replace it with a MOSFET with similar or better characteristics but it still might not work because other components might have been damaged. Are you sure it's just...
  18. Hero999

    NEED BATTERY-POWERED PROGRAMMABLE TIMER

    I doubt you'll be able to find such a thing as there isn't much of a market for it, A PLC would certainly do that but it's overkill nd will be very expensive. An Auduinio board is another option but you still need to connect an output transistor to boost the current capacity. Either way...
  19. Hero999

    single ended output stage

    What are your size constraints?
  20. Hero999

    single ended output stage

    How are you using the transformer? That topology is only any good for a flyback which produces high voltage negative spikes, not a sine wave or even a very good square wave. The only solution is to drop the single ended approach, use a push-pull driver and reduce the turns ratio of the...
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