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steelsiv

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  1. audioguru is right. The biggest problem working with high voltage and/or high current is zapping you transistor. It's not hard to build up spikes that will kill your transistor. A diode in reverse polarity across the coil is a good place to start. If your transistor gets zapped, a snubber circuit may be needed. Working with high voltage/high current can be a very hit and miss project. Have fun.
  2. What everyone is saying is that a 555 does not put out enough current to drive the power transistor into saturation (all the way on).
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