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  1. F

    USB interface with leds

    right, thanks. I got a BD139 instead of the 2n2222a, any problems? also am I really going to need the R11?
  2. F

    USB interface with leds

    right, the transistor. I thought it was the potentiometer in the scheme, misunderstood the symbol. where'd u put the pot in the scheme?
  3. F

    USB interface with leds

    right, so, the opamp has a specific value, like ohms or something, or I just buy a 8 pin one? how about the pot, is it ok to use a 10k pot?
  4. F

    USB interface with leds

    I'll give it a try. I really appreciate all your help, it's just that I'm new to all this stuff, so I don't really get some symbols. I get the leds, ac, earth, resistors, but how about values, for example, R1 is a 5k ohm resistor? and Q1 is a pot? how about the big triangle?
  5. F

    USB interface with leds

    so my question changed. I just want to be able to control led dimming properly with a pot, now, doesnt matter if through pwm, opamp, whatever, but I wanted to be able to have leds OFF when pot at 0%, and leds fully bright when pot at 100%. what would be the best way?
  6. F

    USB interface with leds

    regarding the pot, I bought some dual 10k pots to test, but they didn't fully turn the lights off. I don't need to put 2 currents on the same terminals now that I have a dual pot, but I need a way to turn lights off without a switch. ideas? thanks
  7. F

    USB interface with leds

    @zanderist: Yep, I read about PWM, but as far as I understand, it works to get the leds to the same brightness, rather than having different levels, when dimming directly through the pot. honestly, for now, I'm satisfied with the pot only. If I can get a pot that can turn the leds off without...
  8. F

    USB interface with leds

    thanks guys. I was thinking of using a 100k pot, because I read somewhere they were default for game controller axis. didn't test though, perhaps 10k pots should work aswell. and I also thought of using a pot with a switch, because the only pot i tested with my leds wouldnt turn them off. guess...
  9. F

    USB interface with leds

    well, I didn't find that potentiometer. I've found dual pots, and pots with switch, but never a dual pot with a switch, but some people told me there is one. and that's the only way i could think to be able to control both real leds, and in game axis. but I also have been reported that 100k...
  10. F

    USB interface with leds

    Andre, Sorry I didn't make myself clear. here's a picture of the circuit I'm trying to assemble: So I'm basically trying to use the same potentiometer as an intensity controller AND on/off switch for my Led lights (thats why the pot with switch), and also as a game controller, that controls a...
  11. F

    USB interface with leds

    thanks for your answer! I really appreciate. well, to start with, the USB board, gives me a power supply terminal (that's used mainly to connect leds) of 5v. based on that, I connected 8 leds in parallel, with a 330ohm resistor hooked to each one of them. for now I just hooked a simple on/off...
  12. F

    USB interface with leds

    anyone? I really need help. the question is: is there a way to connect a potentiometer to a usb board, AND make the same pot control leds intensity, without being a dual pot? are there alternatives? if not, where do I find a dual pot with switch, 100k linear?
  13. F

    USB interface with leds

    Hey, I'm new to these forums, or to not-basic electronics in general, so I have no idea where's the correct place to post this thread, but in case it's not here, please move it to the appropriate section. I'm creating a home made cockpit for playing flight sims, so for the first panel, I took...

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