Hi everybody. I recently responded to a advert for an electronic equipment technician. This company refurbishes equipment used in semiconductor manufacturing. Two of the stated requirements for the job are a knowledge of transistor biasing and knowledge of variable frequency drives. I am good with bipolar transistors, a little weak with fets and really need help with mosfets. Can anyone direct me to a website or other material that will help me get up to speed quickly. If I get past the phone interview Monday they will invite me to interview with them in person and take a written examination. Also I need to learn about variable speed drives. In the past I have always treated them as black boxes. They either work or don't work. I assume they repair defective boxes. My guess is that the most common failure on a variable drive is the mosfets.
This question just occured to me, Why are triacs not used in this application? Or are they?
This question just occured to me, Why are triacs not used in this application? Or are they?