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  1. brevor

    Keypad wireless with remote relay for garage door entry

    search online, Home Depot, Menards and Lowes.
  2. brevor

    Wow...he calls it the Scariac!!

    I built one of those scariacs when I was about 12, not quite as fancy as his though. I used to do those capacitor bombs too. At least I never figured out how to get 240 Volts for my "experiments".
  3. brevor

    Flyback transformer spark

    Bad insulation on the wire, electrical tape won't work at 20,000 volts. You need to replace the wire, but it may not be possible to do that.
  4. brevor

    Li-Polymer with i2c chip

    You could try to carefully take apart the battery and remove the temp/voltage sensing circuit and reconnect it into your power supply to read the voltage. If the temp. sensor is a separate part you may be able to replace it with a resistor.
  5. brevor

    I'm a little bit lost with transistors... need help

    Some transistor manufacturers publish selector guides to help engineers find a transistor that meets their needs, however since you state you are "starting to learn electronics on your own" I would ask what you want to do with the knowledge you learn? If you are just interested in doing "hobby"...
  6. brevor

    I'm a little bit lost with transistors... need help

    Since you are just starting to learn about transistors I suggest you buy 1 bag of 2N3904 and 1 bag of 2N3906. That will give you 10 each general purpose NPN and PNP transistors.
  7. brevor

    How can I build a sine wave generator with variable phase?

    How close to the substation are you? Are you sure the noise you are hearing is coming from (acoustically) the sub station?
  8. brevor

    How to control 80 relays using ardrino

    Hello Farukh, As Bob K said there is no reason to power the relays from the battery when the AC is off. Usually systems like this keep the relays off during a power outage and only allow them to come back on after the controller has detected power has been restored. It is normal for the...
  9. brevor

    HELP ME PLEASE......

    Do you still have your textbooks? Maybe you can review some of your lessons to refresh your memory.
  10. brevor

    Cleaning a PCB

    If by "bug stuff" you mean roach droppings I would not clean it, I would incinerate it.
  11. brevor

    raydavis

    please be aware the new member raydavis posting in general chat was posting the same questions over at the AAC forum under 3 different names. We believe he is the same BillyMayo, DannyDavis, VanCastillo ect. that has been banned before.
  12. brevor

    How to control 700 solenoids?

    The mosfets are supposedly rated for 50 Amps, but in the real world you would not want to run them that hard. You may want to check out the following thread where they discuss the current limitations of mosfets...
  13. brevor

    How to control 700 solenoids?

    It's hard to say how to build your own clone of those boards, they don't give much information on the website. They do say it uses mosfets so they are not TIP120 transistors. If you really need to know you may have to buy a board and reverse engineer it.
  14. brevor

    How to control 700 solenoids?

    Sorry, i can't find the link to those boards.
  15. brevor

    Building Preamp from kit but a resistor keeps burning up

    From the photos and drawings he posted it appears to be correct.
  16. brevor

    Building Preamp from kit but a resistor keeps burning up

    So you tried a new C9 and it still smokes, but if you leave C9 out it doesn't smoke. Thats very strange ! Are you sure the 48 Volt source you are using is OK?
  17. brevor

    Building Preamp from kit but a resistor keeps burning up

    I cant find the burned resistor in the photo, check for solder shorts around the resistors pads. Also make sure C9 is not in backwards.
  18. brevor

    Help selecting an alternative chip

    Can you add an inverter to the control signal for the 4066.
  19. brevor

    low voltage lighting transformer problems

    Connecting 120 V to the transformer should be fine.
  20. brevor

    Question for site manager

    Hi John, I am also a member over at AAC, They have rules over there about subjects that cannot be discussed. They often become a bit over zealous when enforcing those rules.
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