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expecting this to be a design problem, but we will not try this until we have our circuit running at least 100 volts output.  In order to get this test supply voltage, we will use five power supply boxes found in the electronics laboratory as Dr. Halpin suggested.    We did not try this with the present amplifier we have do to the fact we did know how the power supplies would react.   

4.2.  Design Record – phase 2.

  We decided to explore other schematics in building our prototype. The main reason was because the elements in our previous design could not handle the voltage and current that would enable us to get the desired output. We fried a countless number of components while we were trying to use the previous schematic to amplify the input voltage.

   This happened because the MOSFET’s and BJT’s we were using were not rated for the voltage and current we were putting on them from the voltage rails. To have our prototype working we have to have voltage rails of at least –90VDC and +90VDC

   We went back to the “drawing board” and started looking for components that would be able to withstand voltage rails we need for amplification. We researched on some for this was because the elements we were using for the first part. The main idea behind our prototype still remained the same however. We wanted to use BJT’s and MOSFET’s to build our prototype because if we used to vacuum tubes the cost of our design would have been outrageous.

   We went back to the previous design we had.

Observing that we needed a current gain stage and voltage gain stage we went ahead and researched the best elements and components that could give us the most voltage gain.

ECE 45125/1/2002

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