ajay_kumar_d

my earlier post yeilded the following results . i was told that the driver for the 2n3055 must be pnp. my diagram mistakingly shows the driver to be npn. if the driver must be pnp, could some one please tell me how negative voltage can be derived from the pc parallel port's o/p pulses.

any further corrections will be gratefully recieved and acknowledged

thanks for the great support.

ajay kd

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