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Simple 555 dc pulse generator.

Discussion in 'Electronic Design' started by [email protected], Sep 13, 2005.

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  1. Guest

    I found a circuit in my electronics book for makeing a dc pulse
    generator based on an NE555. The circuit includes a pot for adjusting
    the frequency. I am going to use this simple generator for driving an
    ignition coil which power a Tesla coil. im wondering if I could build
    this circuit and then after the generator, before the coil, place a
    voltage divider where on of the resistors is a pot for adjusting the
    voltage, and then another pot in series with this output the make a
    square wave generator with adjustable voltage, frequency, and current.
     
  2. amdxjunk

    amdxjunk Guest

    place a voltage divider where one of the resistors is a pot for adjusting
    the
    Yes a pot. setup as a voltage divider will allow you to adjust the
    output voltage, however I think you will find you need more drive for your
    ignition coil. That means your 555 will end up driving the base of a power
    transistor or a FET.
    If you keep looking you will find a 555 circuit with independently
    adjustable on and off times, it has two diodes in the trigger/ discharge
    circuit. This will allow you to experiment for the best on time.

    Mike K.
     
  3. Guest

    Thanks. I hadn't realy considered the power levels a 555 can handle, I
    had only thought about them breifly. I have a couple of 2N3055's
    already mouned on heatsinks I can use. Do you know how many watts a
    typical igniton coil can switch? I am hoping for an output of 5-10 kv
    at at least 1 ma.
     
  4. wrote...
    10 to 20 watts? Considering the inefficiencies, that should
    be good for 10 to 20kV, which won't make much of a spark!
     
  5. amdxjunk

    amdxjunk Guest

    Hi NG,
    I'm not not one to second guess Win,
    (except on politics ;-) However I found
    this site that suggests the coil will draw
    about 5 amps at 6 to 8 volts. The low voltage is
    described in the article. About 100 watts at 12 Volts.
    http://home.earthlink.net/~jimlux/hv/igncoil.htm

    Mike K.
     
  6. amdxjunk wrote...
    My reference was to the available output power, under actual
    operating conditions (not DC). Also, it was a total WAG. :>)
    I don't believe it's a good starting point for a Tesla coil.
     
  7. amdxjunk

    amdxjunk Guest

    Win, I agree it's probably not the best starting point, however he is a 14
    yr old newbie that is smart enough to get some
    experience on a 12 v pulsed system before he hooks onto a 12kv 30ma.
    continuous
    current system.
    Mike K.
     
  8. Guest

    Thank you, newbies about the nicest thing I've heard in this group ;)
     
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