View Single Post
Old 11-11-2010, 09:05 PM   #13 (permalink)
bwilson4web
Engineering first
 
bwilson4web's Avatar
 
Join Date: Mar 2009
Location: Huntsville, AL
Posts: 843

17 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

Blue Bob's - '19 Tesla Std Rng Plus
Thanks: 94
Thanked 248 Times in 157 Posts
Quote:
Originally Posted by JasonG View Post
I may be wrong but,

If you drive any transistor with AC the out put wil match the input, you will get a modulated signal.
A current control device, the output is proportional to the base current but when used as a switch, we 'bang the stops' and either no current, it is OFF, or to saturation, ON.

Quote:
Originally Posted by JasonG View Post
. . .
Yes, MOSFETS and IGBTs are off with no V applied. However their internal draw is so low you need to place a "pull down" resistor from gate to ground. For your application 100K should be low draw. Without this the applied 12V gate signal will take some time to slowly decay before it shuts the output fully off.

I dont think MOSFETS can handle reverse polarity, but if they can it would be cool. I havent worked with them before so I can't say. Testing with 5V will prevent most components from frying if something is wired wrong. Old computer power supplies have 5 and 12V leads and can be found in the trash for my favorite price $0.00 !
Will do and soon.

Bob Wilson
__________________
2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
  Reply With Quote