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Old 22nd August 2008, 02:54 PM   (permalink)
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Originally Posted by piper91765 View Post
Just follow this example from wikipedia if you want the transistor on the high side of the load.

http://en.wikipedia.org/wiki/Common_collector

Why switch to pnp?
According to that article "a small voltage change on the input terminal will be replicated at the output".

I need current and voltage gain from this circuit. It looks like the Common Collector configuration will only provide current gain.

To use this circuit, I'd still have to put another NPN between the I/O pin and the base of this one.
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Old 22nd August 2008, 03:04 PM   (permalink)
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Originally Posted by Willbe View Post
...Vehicle electrical systems, when the engine is running, have a "load dump transient" of several hundred negative volts.
So I'll need something like:

http://www.ifmefector.com/ifmweb/pro...ile/EC2015.pdf

Thanks
Last edited by Atomsk102; 22nd August 2008 at 03:05 PM.
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Old 23rd August 2008, 05:38 AM   (permalink)
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Originally Posted by Atomsk102 View Post
So I'll need something like:

http://www.ifmefector.com/ifmweb/pro...ile/EC2015.pdf

Thanks
Yes, to protect against transients.
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Last edited by rezer; 23rd August 2008 at 05:39 AM.
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