Search found 55 matches

by KamPutty
Mon Apr 03, 2006 8:50 am
Forum: General Discussion
Topic: Oh Nooooo.....
Replies: 10
Views: 3512

Well, there is my next house alarm/car alarm!

Bad guy gets in, turns on car lets say, and poof!

~Kam (^8*
by KamPutty
Mon Mar 27, 2006 8:27 am
Forum: General Discussion
Topic: 90 Watt LED Driver - Need a bit of help here :)
Replies: 57
Views: 14940

Re: 90 Watt LED Driver - Need a bit of help here :)

Whats your plan for the heat build up? I'm playing with smaller LED's ([email protected] / 42 Lumens), not the 1000mA you have, and that single LED builds up alot of heat.

~Kam (^8*
by KamPutty
Fri Mar 24, 2006 8:38 am
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

Re: I've gone mad. npn question.

One more gang, I'm trying to figure out what resister I need from the pic to npn. My PIC16f688 says that the max output current sourced/sunk by any I/O pin is 25mA. I tried a 470ohm resister and man oh man, that makes all the difference (thats the 470 on the base). I always thought that the transist...
by KamPutty
Fri Mar 24, 2006 8:26 am
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

Re: I've gone mad. npn question.

Hi all, Thanks for the reply. And yes, I have been thinking of the transister as a switch and not a valve. I now understand why I need more power to the Base. Very interesting, never knew that. Here is the URL for the company where I got my LED's http://www.luxeonstar.com/ I have the "star" ones, wh...
by KamPutty
Thu Mar 23, 2006 8:58 pm
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

Re: I've gone mad. npn question.

Hi all, thanks for the replys.... LED specs: 3.99v/350mA max rating. (1 watt LED) I am going to use 3.[email protected]. This is how I derived the 7.5 res=(6v - 3.5) / .330 = 7.58 ohm, 0.825 watts I am using a 1 watt resister. About the Base, it seems to be working, I'm not sure I fully understand the issue ...
by KamPutty
Thu Mar 23, 2006 6:49 pm
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

Re: I've gone mad. npn question.

ooops, error


+6v --> LED +
Gnd --> res 7.5 ohm --> npn Emittor
npn Collector --> LED -
npn Base --> res 10k --> pic pin

If I put my meter on npn Emittor and +6v, I get 317mA

If I put my meter on npn Collector and +6v, I get 60mA.
~Kam (^8*
by KamPutty
Thu Mar 23, 2006 6:39 pm
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

Re: I've gone mad. npn question.

sorry for the delay! I have a LED that I want to light. Here is my setup (LED side) +6v --> LED + Gnd --> res 7.5 ohm --> npn Collector npn Emittor --> LED - npn Base --> res 10k --> pic pin I can toggle the LED just fine. If I put my meter on npn Collector and +6v, I get 317mA If I put my meter on ...
by KamPutty
Thu Mar 23, 2006 11:58 am
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

Re: I've gone mad. npn question.

JPKNHTP,

Thanks for the reply. To be totally honest, I'm not sure I understand...

why am I not getting the same voltage from whats being pushed into the Collector, and whats being sent from the Emittor?

~Kam (^8*
by KamPutty
Thu Mar 23, 2006 11:20 am
Forum: General Discussion
Topic: I've gone mad. npn question.
Replies: 27
Views: 6826

I've gone mad. npn question.

Hi all!

I've gone mad.

Said that...

I'm trying to send 350mA thru this npn

link to npn

I send 317mA into (C)
I get 60mA from (E)

From the specs, I thought it could handle that voltage...

Have I gone mad?!

~Kam (^8*
by KamPutty
Thu Mar 16, 2006 2:12 pm
Forum: General Discussion
Topic: lowest cost mcu and how to mass produce
Replies: 13
Views: 3274

Re: lowest cost mcu and how to mass produce

Matt,

Don't give up! So what if Walmart has it too. It just validated your idea! You learnt alot from this project I'm sure, move to the next one, or just make yours better!

But keep on trying.

We all need a cheerleading section...

~Kam (^8*