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  1. dorke

    Multimeter Question

    Let me add, Mostly Beginners don't need True RMS meters (They probably don't even know what it means anyways !);) The main problem with the cheap(Chinese) meters is the build quality of the mechanical selection knob. Otherwise they do a fairly good job(for beginners). These cheap ones can be...
  2. dorke

    Finishing touches on motion alarm

    Wait a minute...Just going to look at my crystal ball for the answer:rolleyes: Seriously, Post schematics and photos etc. ;)
  3. dorke

    Multimeter Question

    You are correct , 0.6A is very low! and mostly not practical. They usually measure up to 10A. How much did you pay for it?
  4. dorke

    Is it the batteries? The handsets? The cradles?....

    There could be a few answers: 1. Wrong kind of batteries. 2. Faked batteries. It looks like you need this kind They appear here,you can contact panasonic for advice and can buy directly from them.
  5. dorke

    TV box H96 Pro + repair

    Welcome to EP, Let me add, Most probably if the IC's on the board do get the correct voltages(5v ,3.3v ,1.8v), then it would be safe to say that some, if not all ,are "fried".:( In this case get a new device,repairing it isn't economical .
  6. dorke

    RS422 to RS232 converter.

    The 9637 is made by some companies. Here it is at DigiKey
  7. dorke

    Is it the batteries? The handsets? The cradles?....

    Most probably wrong batteries. Looks like the batteries will not charge. Can you do a simple test: Swap the original working batteries to a "non working handset",does it work now? Put the non working batteries pulled out from the above "non working" unit in the working handset ,does it...
  8. dorke

    RS422 to RS232 converter.

    You have low speed and short distance. But, Actually you have 2 transmitters feeding 2 receivers . Is the uC for just monitoring the the "working line"? The ICs would be perfect for you,you can get one for about 1$. Place them on the uC board power them with 5V. They provide TTL level...
  9. dorke

    RS422 to RS232 converter.

    In this case (listen only). Use a receiver IC like the AM26C32 ,MC3486 or DS3486 ,you actually need a single receiver (of the 4 in the IC). There are also dual receiver ICs like the uA/MC9637 These are ICs requiring a single +5v p.s for operation. Using a single line(unbalanced, like RS-423)...
  10. dorke

    RS422 to RS232 converter.

    Is this for the same last project that was uploaded here? Why do you need RS-422? It is(was) usually used for long distance,high speed (relative to RS-232).
  11. dorke

    RS422 to RS232 converter.

    Well, Apart of the powering issue these devices are bidirectional! i.e they perform both ways, so they are basically doing 2 ways conversions. 1. Use an externally powered device. 2. Think about the RS-422 termination issue. 3. Like Kelly said,assumption of low enough baud rate to be...
  12. dorke

    Diode replacement on Yamaha DGX 500 contact curcuit board

    Hi Rick, The diodes are on the keyboard interface. The board operates on 5V. The 1N4148 is a good replacement. The 1N969B is a 22V zener diode,it may work since the voltage on the board is only 5V (much lower than the 22V zener breakdown). I would go with the 1N4148 they are very cheap and...
  13. dorke

    Now a days which is the best technology to do a project

    Technology? to do what?
  14. dorke

    Motorcycle stop/turn/tail

    Flipped the sketch :
  15. dorke

    Question about Diode potential of anode with respect to cathode

    Welcome to EP. You can not apply +1V "on" an ideal diode. The most possible is 0V, this will case the diode to conduct , the current will be limited by the external resistance.
  16. dorke

    Obsolete Part Datasheet DZ71100

    Nice find!
  17. dorke

    PSU Hum leaking into Audio (Ground Loop?)

    Please post some photos.
  18. dorke

    Capacitors in Audio Applications?

    1. Anything that isn't DC(fixed in time), is considered AC. So,Audio signals are all AC. Electrolytic Capacitors polarity relates to the DC voltage element only, no problem whatsoever with the AC element of the signal(if the DC element isn't negative). 2. When applying AC signal to a...
  19. dorke

    Need to drain off curent.

    Agree with Bob, What power supply are you using? What is it's current rating?
  20. dorke

    Audio desk

    Welcome to EP. Please post some clear photos. Adding pictures is easy : There is a size limit for each photo. While posting you "click" the "upload file option" dark blue- bottom right of the posting area and upload the photo file.
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