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  1. Arouse1973

    Voltage controlled thru opamp playing up?

    Thanks Adam
  2. Arouse1973

    Newbie question regarding 8w LED bulbs...

    Never taken one apart but I would have thought it would have a capacitor in line to reduce the current to the LEDs. So technically yes this could be done with some modification like remove the capacitor and maybe change the resistor values in they have any. Can you take one a part and show us...
  3. Arouse1973

    Velocity Factor

    Thanks Chris The quote came out of a piss take of the Mechanical Engineers where I work being slower than us Electronics guys. :) Oh I missed the in a vacuum, thought it was a bit wordy. Do you like :) Adam
  4. Arouse1973

    Measuring the inductance of a wirewound resistor

    Ok so I done some measurements. What I found is I didn't have enough drive or fast enough fall time to measure much using the transient approach. So I opted for the steady state approach. I had two resistor which were 0.68 50W and 470 W22 VE 2W. Connect sig gen set to sine and about 10V output...
  5. Arouse1973

    Measuring the inductance of a wirewound resistor

    Yep, you wouldn't necessarily need a parallel resistor and I would only use a cap for the low value resistor to tame the neper frequency if needed. Adam
  6. Arouse1973

    Measuring the inductance of a wirewound resistor

    I love this sort of stuff. What about pinging it with a fast narrow pulse and then working it out from the exponential decay of the neper frequency of the natural response. Obviously the larger resistor values might display and over damped response. But they should ring a bit. I'll do this in...
  7. Arouse1973

    Wiring 2 Potentiometers Together

    If you are not worried about controlling the high speed and are just concerned about the slowest low speed then you could use a fixed value resistor and have a pot across it. Then as you reduced the speed by turning the pot the speed will only be as slow as the value of the two resistors in...
  8. Arouse1973

    Forum Upgraded!

    Looks very good. I like the alerts function, beats going back to see if there has been a reply. I miss the light bulb, knowing when some ones online or have I just missed it. Adam
  9. Arouse1973

    Wiring 2 Potentiometers Together

    That a good start now tell us what wire does what. Is this mains potential? You have three wires going into one connection block what are they. Adam
  10. Arouse1973

    Led project

    Look at the data sheet for the LEDs and that should give you a good indication for what current they draw. Doesn't the flashing LED have a built in resistor? Flashing LEDs used to draw a large current when they start up I don't know if they are better now. What will the resistor in series do I...
  11. Arouse1973

    to make an LED blink

    The blinking bit is the easy bit. The hardest bit is finding an LED that will turn on at 1.2V. Is this an LED module you are planning on using which has a voltage boost circuit inside? What colour LED are you planning on using and the 1.2 volt source where is that coming from? Adam
  12. Arouse1973

    Wiring 2 Potentiometers Together

    Hello Are you able to do a quick sketch of your connections and POT locations including the equipment and label them accordingly. This really help us visualise it better. Adam
  13. Arouse1973

    Voltage controlled thru opamp playing up?

    Did you get the timings for me? What is the duty cycle from the processor for when you expect to see 0.95V on the output of the opamp.
  14. Arouse1973

    increase pulse voltage

    Thanks Harald Adam
  15. Arouse1973

    increase pulse voltage

    Just a curious question Harald, but what is limiting the base current for Q2 PNP? Is it R4? Thanks Adam
  16. Arouse1973

    oscillator doesn't oscillator as I expect

    Yes :)
  17. Arouse1973

    timer

    What's that suppose to mean Steve. He want's a simple circuit to light an LED so I guess understanding the whole project is the best place to start.
  18. Arouse1973

    Hall effect type sensor through 100mm of Wood

    Google hall effect switches, reed switches, and neodymium magnets. You could easily get 6 inches with the right sensor and large enough magnet. Adam
  19. Arouse1973

    Hi, pretty basic question about a simple CMOS TTL circuit

    Yeah Sorry I got a bit confused about what you wanted. The original post did jump about a bit. I think Kris idea is good but do you need to know if all inputs are working. What is the purpose of this circuit what's the end project. I might understand a bit more of what you want. Thanks Adam
  20. Arouse1973

    Hi, pretty basic question about a simple CMOS TTL circuit

    A schematic would be good. Adam
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