Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by beerbaron

  1. beerbaron

    30 kHz / 3 Phase signal

    Wow thanks a lot guys, I think I'll go with a state counter as it's much cheaper then what the LTC6902 seems to be retailing at. I even thing I can make some kind of dead time with a state counter. A uC would have been neat too but since it's a volume item I would have had to make a mask on the...
  2. beerbaron

    30 kHz / 3 Phase signal

    Hi, I'm trying to generate 3 x 30kHz signal each phase seperated by 120 degrees. These 3 phase will be used to turn On/Off FETs that will power some high frequency transformers. What I'm looking for is the lowest cost effective solution to generate the signals. I was thinking of using 3 Op-Amps...
  3. beerbaron

    Measuring low current

    Thanks guys for all your inputs. ±5% accuracy is allright for me. I have a USB card that cand read up to 2000 samples per second. I wanted to use the digital multimeter because it is floating and therefore a lot easier to avoind ground issues. Madcow: LEDs light intensity can vary a lot...
  4. beerbaron

    Measuring low current

    Hi, I'm trying to measure the average current going to a LED that has PWM (100kHz). I used to use a 10 Ohm resistor and a 100uF cap in parrallel that I would put in line with the LED. Problem is that 10 ohm has too much impact on the circuit, using a smaller resistor like 1 ohm or .1 ohm would...
  5. beerbaron

    Raising voltage from a single battery

    Hi, I'm trying to raise a battery voltage from 0.9-1.5V to a stable 3.3V (20mA to 60mA). I'm using a charge/pump inductor with a capacitor to smooth the whole thing. I'm planning to use feedback voltage to keep the output stable. But I'm not sure how to proceed from here. I tough of using...
  6. beerbaron

    Reproducing Solar light

    Nbucska, unfortunately if I have to wait a week for the sun to come out I'm loosing a week of potential results and It's stalling the designs. Also, going outside at -20 degrees celcius to do some tests is not what could be considered fun... That's what we have been doing so far but at the...
  7. beerbaron

    Reproducing Solar light

    Thanks for the reference points. But to produce light with a solar cell we do not only need intensity, we also need wide spectrum since Sillicium reacts more to certain wavelenght. Regards Frederic Boucher
  8. beerbaron

    Reproducing Solar light

    Hi, I have solar panels without specifications to test and I'm trying to reproduce the solar light or a light that would give me as much power output from the solar panel then if it is facing the sun. So far I built a cube of 18"x18" with 4x40W Compact Fluorescent + 1x70 Metal-Halide and mylar...
  9. beerbaron

    I don't undestand how this circuit works

    Yeah, they look like TurboXs showed me, they have Yello Brown Black Silver as color code. Which proves us that they are not really 1 ohm resistors. So these must be inductors, never saw or heard of these type before. They look very inexpensive! Frederic Boucher
  10. beerbaron

    I don't undestand how this circuit works

    Exactly every schematics show an inductor but the circuit I have in hands has none... they seem to have replace the inductor with 2x1 ohm in parrallel depite of what the schematic says. And... it works. I'm confused as well... BeerBaron
  11. beerbaron

    I don't undestand how this circuit works

    Hi, I have got a solar lamp in my hands. Basically it's a photo-voltaic cell, with 1xNiCd 1.2V battery and a 3.3 white LED. The circuit is some sort of controller that will on/off with light exposition to the CDS. It will also boost the 1.2V input Voltage to around 3.1 V. It seem to use some...
  12. beerbaron

    White LED royalty

    That's the problem, we are a manufacturer of lighting equipment, so it's my responsability to make sure that there is no patent infringment. Regards Beerbaron
  13. beerbaron

    White LED royalty

    Hi, I know that white LEDs have some patents on them. But my problem is that I buy my LEDs in China and that I have to believe the LED manufacturer that he paid it's dues to the right company. Is there a way to verify that a manufacturer has an agreement with one company? How can I tell I'm...
  14. beerbaron

    Dimensionning solar panels

    Hi, I'm trying to charge batteries with solar cells. My problem is dimensioning the solar panels correctly. From what I understand most solar pannel are about 12% efficient. So at 12:00 and around (100 000 lux) I could expect 120 W/square meter (sun is 1000 W / meter). My question first...
  15. beerbaron

    Light filter around 592 nm

    Exactly, and implementing an automated system would make more sense if we would be producing the LEDs but we are buying them. In a bag not even on a reel so can't imagine how expensive it could be to create such an automated system. BeerBaron
See more

Part and Inventory Search

Back
Top