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Recent content by jemch72

  1. J

    DC Volt meter

    **broken link removed**
  2. J

    Tesla coils...

    shape the field... I dont have pictures or plans, but this is a one you can do easy, just be carefull... it is not a tesla, but is similar, get a flyback, feed it with fast dc pulses, 20 khz or up, yes dc, not ac,properlly drive it,better use a 12volts dc battery to drive the flyback and...
  3. J

    Dog stopping: Finding a Piezo buzzer/transducer?

    http://www.williamson-labs.com/sdi.htm
  4. J

    Dog stopping: Finding a Piezo buzzer/transducer?

    Cheap response to the post they are cheap, I wanted to show him what I was talking about, I know, you guys know everything...but you never help posting what you know...and you have all the time to find the buts , without solving the but.... https://www.usspeaker.com/cts%20index-1.htm digitan...
  5. J

    Dog stopping: Finding a Piezo buzzer/transducer?

    transducer **broken link removed** the right name is piezo tweeter , this ones respond 30 khz and 200 to 400 watts, and note, this are cheap ones, long time ago i got ones that went up to 45 khz... but 30 khz will do some damage anyway at 200 watts, try to do a variable freq oscillator, so...
  6. J

    Tesla coils...

    That is a nice model, any idea what voltage are you getting in the out? and freq you tuned it? it is very high diameter for the secondary..like 6 or 8 inches righ? any way , 22 to 28 inches is very good...also very noisy...try blowing some argon gas over the toroid..jejejeje A great One!
  7. J

    L293D mis-behaving

    high z Great, yes, high impedance give you that kind of problem, as I said before, a secure level, 0 or 1 , but secure...not high Z...
  8. J

    DC Power Supply PCB

    a zener well used from gramo **broken link removed**
  9. J

    Tesla coils...

    a way cool one ,from australia... **broken link removed**
  10. J

    L293D mis-behaving

    the input... what about the input from the pic? are you sure it is 200 hz pulses , did you see it whit oscilloscope or scope meter? or measure it with meter?
  11. J

    L293D mis-behaving

    may be... may be is fryed, but you can figure it out testing it , now, max. input voltage is 7 volts, I guess you did not over pass that? now, what did you connect to the output? you have 600 mili amps... and the enable is high right? I mean a secure high level not disconnected, you can connect...
  12. J

    DC Power Supply PCB

    you are wrong, the best idea is the lm-317 ...
  13. J

    DC Power Supply PCB

    zener diode Wow, zener diodes are for reference , not to be use in the output, more than decades dedicated power supply have ref. voltage from zener diodes...
  14. J

    DC Power Supply PCB

    oh my god Did you realise that are milivolts? any way, again, i am giving a "get out of the problem" solution , I am not posting to try to help somebody that dont know much, of course is not the high tech solution..i suject the 2n3054 with a zener, but this guy burned a zener before, so bad...
  15. J

    DC Power Supply PCB

    now semi conductors are resistors I will have to go back to university, I did not know new semiconductor are resistors now...I know a pic can do thing that at my times I did with a 8031 an adc converter, a fifo and uart in one chip, but did not know about new diodes... sorry for my poor...
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