high voltage driver

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 |                                           >             
gnd                                          >R1        
                                             >              
                                             |   
                                             |B        
                                            ---      GND 
           T1:NPN Power Transistor:2N3055  C/ \E     | 
                                           /   \     |
                                          | TVS |    |
                                      ----+->|<--+----+

TVS: This is a back EMF snubber. It may composed of a variety of components to suit. Sometimes you see zeners, or RC circuits, or transorbs (transient voltage suppression diode).