In a message dated 10/11/97  21:05:51, you write:

<<
 Hi,
    I need to drive a DC 1/8 HP DC motor via PWM using a 16c74.My problem is
 which transistors I should use to do this and how to trigger them.I have
read
 something on IGBT being used in power inverters,but I have also been told
 they are somewhat more complicated to trigger than a regular MOSFET.
    Could someone tell me what's my best choice?
    Thanks.
  >>
What is the voltage you need to drive it from ?
The higher the DC voltage the lower the current.

To drive Lager IGBT look out the siliconex SI9910DJ Mosfet driver IC It comes
complete with desaturation protection. You will need to add a PNP transistor
to turn off the IGBT as it can take sevrel amps to discharge the Miller
capacitor. The whole circuit works from 15V and this can be derived from a
single supply using a fast diode for the High side driver dont forget the
opto couplers that drive these will have to be reasnoably fast we use H11
units with smhidt but most fast ones are ok. If you are worried about DIY
drivers look at Semikron SKHI200 this is a universal twin output driver which
will drive IGBT's up to 400A and 1200V.

Cheers Steve.....