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  1. Arouse1973

    Back lit Chess Board, Led Question

    I think you need an LED with a wide half angle say 85 degrees. They are not normally that bright because otherwise you might get spotting. This is where you can see the high brightness part of the LED. I think you want something that's going to defuse nicely over the coloured plastic your going...
  2. Arouse1973

    Use Capacitive Sensing to detect a train?

    Hello Yes it could be done with capacitor sensing, but have you also considered a magnet and reed switch or hall effect device. You could also look at metal detectors this could also work it if the train had large enough metal parts. Adam
  3. Arouse1973

    Help with Arduino error: protocol error, programmer is out of sync

    Ok just a thought. Adam
  4. Arouse1973

    Designed a 10watt LED driver...

    And do you have a question? Adam
  5. Arouse1973

    Back lit Chess Board, Led Question

    A couple of things first. 1. What LEDs are you going to use? 2. What power supply are you using? 3. How much power do you want the LEDs to use I.e how bright? 4. How many LEDs are you going to need, I noticed 3 LEDs in series in your drawing, is this the maximum? Adam
  6. Arouse1973

    AC power generation and transformers

    Fair point JB, didnt think of it like that. Adam
  7. Arouse1973

    What would 'high-power' be considered? (Constant Current Source)

    I agree with Bob constant current is the best option. Stay away from high voltage because moisture from outside can cause issues with circuitry that is not sealed. Adam
  8. Arouse1973

    AC power generation and transformers

    The magnetic field is a fact of life, but the electricity company would want to reduce this as much as possible. Without power factor correction this is wasted energy so they would want to keep the inductance to a minimum. Adam
  9. Arouse1973

    Capacitors in parallel effects on frequency

    The resistor after the capacitor is what is causing the attenuation. Think of it as being a frequency sensitive voltage divider. In a high-pass filter you are not interested in DC because this is blocked by the capacitor apart from a small leakage current. The resistor the other side of the...
  10. Arouse1973

    Binary 1-wire switch status (closed/open) sensor?

    Could you use a one wire A to D for this? http://www.maximintegrated.com/en/products/comms/one-wire/DS2450.html Adam
  11. Arouse1973

    I need to time an AC outlet by seconds, or a break in a DC line

    Yes and people new to electronics don't suddenly become programmers over night, if at all.
  12. Arouse1973

    Small Microphone transmitter

    I got it running at 8.3 MHz but it looked like it was going to give up at any moment. Adam
  13. Arouse1973

    Looking for compatible replacement FETs for a Automotive blower motor resistor

    Thanks for the photo's. The only thing I can find is a MCR506 which is an SCR but no sure, similar case which might have been updated from the TO-220. Can't find anything on the other part. This is a real mystery, someone else might have another idea of what they are. I'll keep looking and let...
  14. Arouse1973

    Component Identification

    Hi Dan I'll have a look, good idea Adam
  15. Arouse1973

    Help with voltage follower

    You could use an OP-amp with an NPN transistor on the output as a current amplifier. Choose a rail to rail opamp powered from the 12 Volt supply. The transistor should be rated for at least 1A if not 2A and you might need a small heat sink. You could look at using a Darlington transistor instead...
  16. Arouse1973

    Small Microphone transmitter

    LOL Bob, yeah I guess I am lacking in the Hertz department a bit. I'll see what the max I can get tomorrow and keep you posted. Adam
  17. Arouse1973

    Looking for compatible replacement FETs for a Automotive blower motor resistor

    Can you take some pictures for us. Nice and close and clear taken in a well lit room. Thanks Adam
  18. Arouse1973

    My Project motor driver Smoked what driver i really need ?

    That looks like the Rover 5 Dagu 4 channel motor controller with encoder support if I am not mistaken :eek:. H-Bridge MOSFET rated at 4 Amps per channel. Were you using the current sense capability of the motor drive PCB when this happened? Adam
  19. Arouse1973

    Help! Question about a pressure sensitive switch

    I also like the light sensor idea Kris! Adam
  20. Arouse1973

    Help! Question about a pressure sensitive switch

    If you just want to sense when something is removed, could you could use a micro switch with a springy lever you could use this to switch on the light also. Sandwich this between two plates with small springs in either corner. Just an Idea. Adam Picture of a lever micro switch.
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