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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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  #1  
Old 11-19-2012, 10:27 PM
sonofptolemy sonofptolemy is offline
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Join Date: Nov 2011
Posts: 11
Default Choosing the right transistor for switching application

Hi guys,
I need to create module that can switch between loads.

There are two input banks, each bank will take about 30V max.
For each bank I must have TTL outputs for Voltage and current measurements. In the requirements I have specified that there should only be one voltage feedback and one current feedback, and an input switch to switch between banks.

I have the basic idea in my head.

But I'm somewhat limited in my experience with Mosfets, BJTs and transistors as switches in general. I've used them for school projects but I never actually selected them I was either given them or my team mates and I would use what was available from scrap electronics etc and looked up their datasheets. I have built robots and such this way. But this time I need to actually do it properly and intentionally.

Can I get a push in the right direction as to which kind of transistor I should use and how to select it?

I think I need Power Mosfets, but what kind?
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Old 11-20-2012, 02:58 AM
wayneh wayneh is offline
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Join Date: Sep 2010
Location: Roscoe, IL
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Quote:
Originally Posted by sonofptolemy View Post
I have the basic idea in my head.
Well that's good, but I couldn't make heads or tails of your description. Can you draw out a block diagram of what you want your switch(es) to do?

You mention using a transistor. Do you not want to use a mechanical switch?
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Old 11-20-2012, 03:26 PM
tshuck tshuck is offline
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Default

...also, what is your switching frequency?
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