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  1. (*steve*)

    BAT. Holder

    Mine are NiMH. A colleague of mine occasionally collects very lightly used energizer industrial D cells used in a medical appliance for the duration of a single operation. The hospital is a large consumer of them.
  2. (*steve*)

    BAT. Holder

    Does it matter? My 6000mAh batteries are real D cells. And yes, there are many people who use D cells. Maybe not as many as there once were, but not "nobody".
  3. (*steve*)

    simple radio amplification

    Microwave is not a power level. Microwave transmissions are frequencies between a couple and tens of GHz What are you actually trying to do?
  4. (*steve*)

    BAT. Holder

    Our just get a single D cell holder, remove the contacts from the end and mount them at the ends of a suitable length tube. I use yet another method for charging my D size nimh cells. I place a disc shaped rare earth magnet between the cells which holds them together, and on the ends of the...
  5. (*steve*)

    Detecting a Signal of varing contant frequency

    Convert the rising edge to a pulse, and extend it to the maximum duration you want to see between pulses. Then, if that signal every goes low, the motor is rotating at a speed less than your minimum. If you want to make this easier to see, then use another similar circuit (similar to the...
  6. (*steve*)

    hacking rc helicopter - need help

    OK, now I can see your diagram it makes both more and less sense... It was my last point in the post I lost, but it will be my first point here. 1) You need to learn how to draw circuit diagrams. 2) Your guess that the 100 ohm resistor might be the problem is a good observation. It is quite...
  7. (*steve*)

    LED Specs

    Yeah, can you compare your post to the question asked?
  8. (*steve*)

    LED Specs

    Colin, without comparing the half angle you are just going off half-cocked (again).
  9. (*steve*)

    Power supply voltage dip protection design

    Probably very little. It is possible that the resistor may get a little warmer, if it's not noticeably warm now, there's probably nothing to worry about. Is the contactor rated for 33V? Why not use a bridge rectifier and a large filter capacitor?
  10. (*steve*)

    LED Specs

    No, it means at 80mA the voltage across them will be between 3.0V and 3.4V and the light outut will be between 16000mcd and 20000mcd. The actual intensity is not guaranteed to be correlated with Vf at a particular current.
  11. (*steve*)

    idea for temperature cold spot warning

    In some respects, all you need to do I increase the clicking rate. Each click will have the same energy, so a faster rate will sound louder up to a point. Is this device to be fixed in one place or some sort of hand held probe?
  12. (*steve*)

    Which relay should I use?

    Because you supply DC to the controller. Look on Wikipedia for more information on this. I would presume it can't. Or, if it can, you are risking it failing.
  13. (*steve*)

    hacking rc helicopter - need help

    I wrote a long reply to this, but it vanished :( I'll try to get my thoughts together and post it later.
  14. (*steve*)

    Control AC motor speed with mosfet?

    They are synchronous motors (I believe). Frequency control will be the effective method. Perhaps you could pass through every 3rd half cycle. It's something I've thought of doing, but have yet to try it.
  15. (*steve*)

    Special Led Chip Array With Step Down Converters.

    I home you're going to suggest a circuit where the regulator is set up to supply a constant current, not a constant voltage. I'm also really interested in why you want to forgo the efficiency gains you would get with a switch mode regulator?
  16. (*steve*)

    Need help repair Sunshine ATX psu

    No, they ask seem to be what I would expect. I think you're barking up the wrong tree.
  17. (*steve*)

    5v/12vdc inputs and only one of those as outputs using PIC18fxxxx

    The 4066 will work fine IF you can change your current requirement from 250mA down to 2.5mA.
  18. (*steve*)

    Which relay should I use?

    No, you must not exceed the current rating. Or the voltage rating. And you can't trade one off against the other. However, if you have access to the datasheet it may have a different carrying current to the breaking current. If the current falls when you switch and you stay within the specs...
  19. (*steve*)

    MT9M111 camera module

    I couldn't find anything for the rpi, but they're is arduino code for a custom shield using this camera. It might be worth looking at that. Google "mt9m111 arduino"
  20. (*steve*)

    Which relay should I use?

    No, the relay coil should still be DC, but the contact ratings can be those for AC, which for a given relay is typically much higher.
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