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  1. dorke

    Wanted: A proccesor from VEEDER-ROOT

    Welcome to EP. I think it may very well be a dedicated in-house ASIC chip. In this case your only hope is to contact VEEDER-ROOT directly for help, they may be willing to sell you one if they have it and if they are nice;)
  2. dorke

    Pins with pullup resistors built in

    O.K The term pull-up(down) resistor is a term coined in the digital world. It is related to the inputs of digital circuits-in which we would want to decide the input logic state of an un-used input as well as a default logic state for a used input(weak pull). It is also related to the outputs...
  3. dorke

    Pins with pullup resistors built in

    The answer to your question is "hidden" on the AVR datasheet on chapter 14 (page 75). Why on earth do you think an analog input should have a pullup resistor?o_O
  4. dorke

    High Low logic

    You can build a 2 transistor schmidt trigger comparator circuit. Like Bob said, a single transistor circuit isn't good enough. Alternatively, You can use a single very small(sot-5) comparator like the TL331. Note: You have a very accurate Vref(1.22V) on the Adj. pin(pin-2) of the LT1763CS8...
  5. dorke

    Solder Sucker

    The one you posted is fine to use. There is the professional version with "auto" vacuum as well. I was referring to the cheap manual push button ones the O.P posted , sorry for not being clear.:(
  6. dorke

    Solder Sucker

    I wouldn't use those suckers at all ! Their main disadvantage is they tend to pickup the pad from the PCB with the solder and all. Use solder-wick from a good brand, it will save your PCBs from harm and...:eek: Will save you a lot of heartache.
  7. dorke

    Garage Door opener capacitor replacement

    You should know or measure the actual operating voltage of that motor. For 220V you should use the 450V(and above) CAP. only! For 120V you can use the 220VAC , 250VAC or 330VAC caps. Do what is the actual voltage of the motor?
  8. dorke

    Dual Cycle Flip Flop Timer

    Welcome to EP. It isn't clear enough. Do you want to measure the time it takes to travel the winch from one side to the other? Do it in both directions of the movement?
  9. dorke

    Circuit help

    This sounds un-safe. What kind of Diploma?
  10. dorke

    Circuit help

    Welcome to EP, 1. You should remove diode D5 it isn't needed,it will be the first thing to blow-up. 2. SW4 normally close, will short circuit the +dc on C2 'blowing the bridge D1-D4. 3. What do you need SW4 for any ways? 4. There is no need for relay RL1 for operating such a circuit. 5. The...
  11. dorke

    Sample circuit for motion sensor

    Welcome to EP. No you shouldn't use the circuit at 5.3 Here is one circuit for you and here is another. Hope it helps.
  12. dorke

    Need to Figure out if this Spectrum Analyzer Works

    No.it isn't noise,these are harmonics of the main 54Mhz frequency. It is the way it should be. Assuming the input attenuation is set to 0dB,and that the cable you are using is good. The amplitude reading you get isn't correct ,it should be -40dBm. You should use the calibrator pot(top-right)...
  13. dorke

    Just murdered a MOSFET. What did I do wrong?

    The FL-11753 solenoid is 50V /5A. You shouldn't operate it with 70V! make sure that your P.S supplies 50VDC. The MOSFET you are using should be rated higher current than 5A (8A?) That "Flipper assay" drawing is something you made yourself from an existing device? or did you build it from...
  14. dorke

    This might be a fun disscussion :)

    I would think it would be AC in the form of high energy light(frequency much above visible light) that would be converted directly to DC("photo-voltaic" 100% efficiency). DC would be good for storing in batteries for use in brown-out emergency situations. o_O
  15. dorke

    I Want To Make A Device That Tells Me That Electricity Is Back

    Well, You could use an old VCR plugged directly to the electric company feed. They start blinking (no sound) when the power is back on. ;)
  16. dorke

    Low cost (single ended) soldering pins?

    They are called "board to board headers" or simply "pin headers" They are very cheap and easy to get. The standard are square pins , 0.1" spacing,they are easily breakable. It is possible to salvage them from old PC-boards etc. You may find them in a local shop near you as well.
  17. dorke

    Transistor gate voltage

    Can you explain what is the purpose of this circuit,is it to be a battery load?
  18. dorke

    Just murdered a MOSFET. What did I do wrong?

    Assuming the 2A fuse at the transformer output is the correct value needed(it's location is not "traditional" though) , the rating of the AC-line fuse should approx. be 2A *50VAC/115VAC=0.87A. It is important that you measure the solenoid "on current" ! or better yet, post it's datasheet...
  19. dorke

    Onkyo Integrated Amp With Incredibly Low Volume

    "Help me, electronicspoint. You're my only hope!" No need to be so dramatic.;) This is were a scope will be very helpful 'but you probably don't have one. How about building a simple audio probe? Like this guy does.
  20. dorke

    Led light bar

    So, You need to cascade two 74HC299 to get 10 bits. That would be a nice little project for you. Try it and you can get some help here as well. If you knew some VHDL you could program a small PLA to do the all thing. It can be done with a uC as well,some software knowledge is needed for that.
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