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spark gen

Discussion in 'Beginner Electronics' started by Nick Williams, Oct 15, 2004.

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  1. Any ideas?

    I have a circuit as follows

    9 volt dc input, 555 oscillator driving 1:500 coil, bridge rectifier and
    smoothing caps, giving a rail of 4.5kv. From this rail, 3k3 in series with
    33nf cap to ground. Spark gap in parallel with this cap. All works fine and
    runs for 20 hours in two or three 8 hour sessions. Then at switch on, some
    kind of plasma / corona effect at the wire exit of the diodes, followed by
    further breakdown. Diodes started with a Vrrm of 5kv, 5ma, and have been
    upped to 30kv, 3ma. The same problem occurs, but now takes a little longer.
    Anti corona varnish does not help.

    I need to run the unit for sessions of 10 hours, and ideally continuosly.

    Any ideas??

  2. Vidor Wolfe

    Vidor Wolfe Guest


    I wonder if you could submerge the diodes in oil.
    This should help prevent the corona.
    Try posting to
    Bert Hickman frequents that group and is very knowledgable in HV and high
    energy applications.
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