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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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 Posted: Fri Jun 08, 2007 5:28 pm Post subject: FET vs. NPN (was HELP!) |
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>>>>Kinda like this if you like FETs better... Both schematics attached.
Since we are now knee-deep in this, pros-cons on MOSFET called out in Bob's original design (IRF510- assume this is component compatible to Kuffel suggestion?) and 2N2222 transistor- cost, mounting considerations, efficiency etc?
Or not really a big deal as either are good choices?
Great stuff- you guys are the best! (xoxoxoxo  )
Mark do not archive
See what's free at AOL.com.
[quote][b]
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retasker(at)optonline.net
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| Posted: Fri Jun 08, 2007 7:59 pm Post subject: FET vs. NPN (was HELP!) |
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The two transistor (bipolar or FET) approach is slightly better (in my
opinion) than the single transistor approach in that it doesn't draw
significant currents except when the LED is on. The single transistor
approach is somewhat of a compromise since it has to draw a relatively
significant current to keep the LED off. If you had the LED with no
built-in series resistor it would be better, but would still be somewhat
less desirable.
As far as using a bipolar transistor vs a FET, that is pretty much up to
user preference. I suppose a slight case could be made for the bipolar
transistor being less susceptible to static electricity handling
problems, but with a tiny bit of care, that is moot.
This is not to say that there are not cases when one or the other is
definitely preferable, but for the circuit in question it really makes
no practical difference.
Dick Tasker
Fiveonepw(at)aol.com wrote:
| Quote: | >>>>Kinda like this if you like FETs better... Both schematics attached.
Since we are now knee-deep in this, pros-cons on MOSFET called out in
Bob's original design (IRF510- assume this is component compatible to
Kuffel suggestion?) and 2N2222 transistor- cost, mounting
considerations, efficiency etc?
Or not really a big deal as either are good choices?
Great stuff- you guys are the best! (xoxoxoxo )
Mark do not archive
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See what's free at AOL.com
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Fri Jun 08, 2007 8:35 pm Post subject: FET vs. NPN (was HELP!) |
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In a message dated 6/8/2007 11:02:57 PM Central Daylight Time, retasker(at)optonline.net writes:
| Quote: | for the circuit in question it really makes
no practical difference. |
>>>
Thanks again as always, sir!
Mark do not archive
See what's free at AOL.com.
[quote][b]
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