LinkBack URL
About LinkBacks
Reply With QuoteCome on, I know I'm not the first one to do something like this.
Since the serial port only puts out like 8 mA, I need a relay that will latch using low current like that. The only relay that I found that seems like it will work is this: http://news.thomasnet.com/fullstory/479655
That relay only requires 5 mA to latch, which is perfect BUT there's a big problem.... No one carries them. I've called many distributors, but the product just isn't being sold. ETA (the manufacturer) has a $1,000 minimum order, so that's out of the question.
Does anyone know where I can get a low current relay that will work off of less than 8 mA?
Come on, I know I'm not the first one to do something like this.
True, but you seem to be going about it in a strange way. Rather than get a low current relay I would use a transistor to amplify the current.Originally Posted by XxAndyxX
I usually use an bipolar NPN open collector arrangement for switching loads.
Old Systems retired due to new car
New system at design/prototype stage on BeagleBoard.
May I ask you what do you need to switch-on?
"We cannot solve our problems with the same thinking we used when we created them."
AE
As Rob said, use a transistor. If you need a relay, use a transistor to drive the relay coil.
I'm trying to control my amps. I figured a low current relay would be easiest, but I guess I'm going to resort to a transistor, or maybe try running the DTR and RTS together to get more current.
well, as I looked at my amps specs ( audison and sony) no one needs more then 5mA for remote . I think that you dont need any relay. Just one mosfet transistor and you can use it for 10 amps
rob: I think that mosfet is in this case better than bipolar , don't you think ?
"We cannot solve our problems with the same thinking we used when we created them."
AE
I would like a relay for protection. Using a relay would isolate the circuits, therefor protecting my motherboard and other computer components.
Not a big difference at this current. If you are using an n-channel fet as a high side driver, afaik you need to generate a gate voltage higher than the voltage you are switching to saturate the gate. This can involve charge pumps, etc... P-channel are easier to use, but seem to be harder to find.
I've always found bipolar easier to use, and harder to destroy.
But as I said, it doesn't make a lot of difference for low current.
Old Systems retired due to new car
New system at design/prototype stage on BeagleBoard.
Posting Permissions
Bookmarks