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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
    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.

    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.
    current system.
    Mike K.
  8. Guest

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