Transistor or Mosfet

Discussion in 'Analog & Mixed-Signal Design' started by vandaycalta, Jun 18, 2016.

  1. vandaycalta

    Thread Starter Member

    Mar 22, 2016
    53
    4

    Please refer to post #36 on this thread.

    Val
     
  2. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    7,757
    2,183
    There are ***so*** many things wrong with that response. Be thankful you are on AAC. On other fora the moderator would have killed the thread after 8-10 posts with no schematic. This is an electrical engineering forum, and when discussing electronic circuits there is nothing - n.o.t.h.i.n.g - more important than the schematic. Someone with language skills much better than yours could write a complete circuit description that told us everything we needed to put your question into some context, but that would take 400-500 words and most would not bother to read it.

    Schematic first, everything else second.

    Now that I see what you're up to,,,,,,,,,,,,,, it looks like your approach to "in effect stopping the signal" (a 130 W signal) is to short it continuously to ground. Are you sure you want to do it that way? You could stop the signal more effectively and with much less heat and component stress by putting a P-channel power MOSFET or PNP BJT in series with the 13 V supply to the coil, or an N-channel power MOSFET in series with the switching transistor's GND connection. Or or or... Stopping a signal (reducing the energy flow to 0 W) and diverting a signal to ground (continuous energy flow of 130 W) are two very different things.

    ak
     
    Last edited: Jun 25, 2016
    cmartinez likes this.
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