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  1. BobK

    Help with N-Channel Mosfet as a switch at low voltages.

    When on, your MOSFET is shorting the power supply! Bob
  2. BobK

    Steel work bench

    The posts in here made me think of something. Is it a good idea to use a GFCI for mains power used on the workbench? It seems like it would protect against one type of shock (grounding through the body) Do you use a GFCI? Bob
  3. BobK

    Capacitor charging

    Hey, maybe that is what TheMaster is trying to build (in a different thread.) Bob
  4. BobK

    50 euro computer possible or not?

    There are android smartphones that sell in that range (50 Euro,) Bob
  5. BobK

    Driving this MOSFET with PIC

    2MV? That is 1000 times what you said before. And it is unrealistic to think that you will be able to produce that. Bob
  6. BobK

    Project Kickoff - Variable Frequency Generator WITH interrupts (gaps)

    Yep, easy microcontroller project. Bob
  7. BobK

    Driving this MOSFET with PIC

    And, the voltage of the secondary, divided by the primary, is 2V! If you leave the secondary open, you will get a high voltage pulse, but not if the secondary is driving a load. Bob
  8. BobK

    Driving this MOSFET with PIC

    That is his claim, but he is wrong. He is feeding 2V into a flyback transformer. Bob
  9. BobK

    Driving this MOSFET with PIC

    If your transformer is producing 2kV from a 2V input it has a turns ratio of 1:1000. So, given that, what voltage would be required on the secondary to produce 2kV on the primary? Bob
  10. BobK

    Advice on LCD display for Picaxe project.

    That is correct. If you want to use that code, you need to get an LCD display with RS232-like serial, as I explained before. Bob
  11. BobK

    op amp

    The output you get with a DC signal depends on the feedback network, the signal on the non-inverting input, the supply voltages and the characteristics of the op amp. If you have the non-inverting input at 0V and you put 5V on the inverting input, the output will be has close to the minus rail...
  12. BobK

    Driving this MOSFET with PIC

    I think he is saying that the load for the HV is purely resistive. Clearly there is either an inductor or transformer to produce the high voltage. If it is a transformer, there should not be 2KV spikes on the input side. Bob
  13. BobK

    Solar Panel running 2x20m RGB strips

    In that case, the panels do not have to create enough power to run the lights. That is what I was getting at. Bob
  14. BobK

    Computer/electronic integration

    The USB GPIO boards that I mentioned will easily do what you are asking for. You just need to get one with 8 digital output ports and wire up an LED + resistor to each port. Bob
  15. BobK

    "random" blinking LEDs: purpose-built circuit, or Arduino or =

    Well, that does say "purple UV", so it is not strictly UV. Bob
  16. BobK

    Advice on LCD display for Picaxe project.

    I took a quick look at the PICAXE manual. It looks like it has support for either parallel LCD's or serial (meaning RS232 type serial) not IIC. So you will have to roll your own for use with IIC. I think you can find LCDs that use RS232 type serial interfaces, which might be a lot simpler to...
  17. BobK

    Advice on LCD display for Picaxe project.

    You can control it from the PICAXE. II2 is a synchronous protocol, you don't need any special hardware to implement it, though the PIC chip does have it and PICAXE probably supports it with library functions. Bob
  18. BobK

    "random" blinking LEDs: purpose-built circuit, or Arduino or =

    I guess I missed that :oops: Bob
  19. BobK

    Need help with a circuit

    Well, it doesn't have to be the use of NC contacts. It could be that whatever circuit is driving the relay needs to be either pulled up or down to open the relay. Bob
  20. BobK

    Capacitor charging

    30V was the average. The inverter most likely produces short high voltage pulses, which might very well average to 30V. Bob
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