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  1. Arouse1973

    Low voltage disconect circuit

    Hello Leot, welcome to EP Your circuit needs a base resistor. Try a 1K to start with and see if the relay still works. This will be the reason that the feedback isn't working also. Thanks Adam
  2. Arouse1973

    cheap & simpe Arduino projects ???

    My first Arduino project was flashing an LED. Now I have two flashing. I am hoping to go for a third. Then I think I might see if I can write my own graphics LCD routines. Adam
  3. Arouse1973

    Current Limiter Circuit

    Hi Hop The OP said he wanted 1 Amp at 20 Volts. I was merely saying that the voltage will drop if he tries to draw more current than this. I guess he knows that. In a bench power supply where you can adjust the output voltage then current limit and regulation could be considered the same thing...
  4. Arouse1973

    cheap & simpe Arduino projects ???

    Turning an LED on?..... Give us a bit more of a clue, there are 100s of simple project. You must have an interest in something?
  5. Arouse1973

    Current Limiter Circuit

    Ok so you know that the voltage on the output of the regulator will be 1 Amp * RL. It's just you said you needed 20 Volts at 1 Amp. That means your load can't be lower that 20 Ohms. Does this still apply. Do you have your circuit diagram you have been working on? Cheers Adam
  6. Arouse1973

    Input Z of single supply opamp circuit

    Does your circuit look something like this?
  7. Arouse1973

    Code execution in ISR too slow.

    Yes correct, but is it running at full speed internally. If you do a test with a pin setting it high and then low what timings do you get? This will give you an indication of the clock it's using.
  8. Arouse1973

    Code execution in ISR too slow.

    Looking at the circuit for the dev board you are using one of the micros has a 20Mhz clock, this should easily achieve less than 1 microsecond instruction cycle. See if there is a pre-scalar you can change.
  9. Arouse1973

    Code execution in ISR too slow.

    Can you stretch the timings of the incoming signal and then scale it back in software? Adam
  10. Arouse1973

    Regarding the IC

    How much current do you require? What's the circuit for, can you use a switching regulator? Thanks Adam
  11. Arouse1973

    Code execution in ISR too slow.

    Hello Can you run the micro at a higher frequency. What frequency are you currently using? Adam
  12. Arouse1973

    Current Limiter Circuit

    Hello Jammill. Can you explain a little more about your application? Welcome to EP BTW. Thanks Adam
  13. Arouse1973

    Circuit Analysis Help

    Well done @Ratch.
  14. Arouse1973

    Circuit Analysis Help

    H Chris, yeah sorry I misread your post, of course you wouldn't know the current in the 2R. I would have to dig out my books to help you work it out properly, it's been a long time. I do my own thing for problems like this, I guess it could be a combination of loop and node, I don't get too hung...
  15. Arouse1973

    Circuit Analysis Help

    Hi Chris. So you know the value of current through the 2R. What voltage does this develop across the resistor? I bet it's less than 9 Volts. To make sure the voltage across the 9 Volt source is 9 Volts what do you think has to happen to the other side of the voltage source? Adam
  16. Arouse1973

    RF noise from a chip dc-dc step up module, fix?

    Is this ambient RF noise or on the output of the device? Adam
  17. Arouse1973

    Need Help Improving Brightness in Multiplexed 7 Segments (6 Digits)

    Fair point Hop. Adam
  18. Arouse1973

    SurgeProtector Strange behaviour

    I have a 007 key to release you :)
  19. Arouse1973

    SurgeProtector Strange behaviour

    You need to tell us about your device, I have tested many surge suppressors to lightning levels. You need to be a bit more open about your product. Adam
  20. Arouse1973

    Need Help Improving Brightness in Multiplexed 7 Segments (6 Digits)

    You dont get much flicker Hop if you run at 200Hz. Adam
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