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  1. (*steve*)

    UV LED PCB Lithography Exposure Unit

    This is where my colleague obtained his LEDs. He notes that the price has come down in the last 5 years :-)
  2. (*steve*)

    Super Simple Circuit questions

    That circuit will draw essentially zero power when the LEDs are off.
  3. (*steve*)

    UV LED PCB Lithography Exposure Unit

    I will enquire and get back to you.
  4. (*steve*)

    "Repair" mystery

    Is the timing magic in the bulb? Child of have decided it was an off time?
  5. (*steve*)

    Super Simple Circuit questions

    No, it just reduces the current through the switch
  6. (*steve*)

    Super Simple Circuit questions

    In series with the switch (A), NOT in series with the capacitor (B) In series with means like holding hands whilst walking side by side. (in parallel is like standing in a queue with your hands on the shoulders of the person in front)
  7. (*steve*)

    Super Simple Circuit questions

    No, that's in parallel. Draw it in series. You've also done something odd with the 10M resistor. Check the original diagram you were given. In your diagram you have two sets of three LEDS. Each set of three LEDs are in series. edit: it's drawn the way @KMoffett drew it for a reason. Your...
  8. (*steve*)

    Capacitor in a DC circuit

    The "A capacitor blocks DC" is a generalization that only has useful meaning when it is in series with something. A capacitor resists a change in voltage across it. Current must flow (in proportion to it's capacitance) in order for the voltage to change. When a capacitor is in parallel with...
  9. (*steve*)

    Tektronix 2445 Scope Repair? ANY help would be appreciated!!!

    I think your best bet would be to find a forum dedicated to Tektronix maintenance and repair. I'm sure there was one, but I can't remember its name. If nobody else knows, I'm sure you could ask here.
  10. (*steve*)

    WNG noise toaster

    I have made about 30 modules from nonlinearcircuits. Once a month Nathan and Andrew come to my local hackerspace and anything up to 40 people build either the "module of the night" or some other module that they're interested in.
  11. (*steve*)

    How does a GPS receiver/transmitter (transceiver) work on a circuit board?

    Yeah, what Hop said. If you try to find the location of the ski pole after it's under 10 feet of snow and ice, you're not going to have a lot of success. Far better to periodically track the location of the ski pole. Then if it stops responding you know approximately where it was. If you're...
  12. (*steve*)

    Super Simple Circuit questions

    The switch across the 1uF capacitor may not like the current from the capacitor. I'd put a 100 ohm resistor in series with the switch.
  13. (*steve*)

    Keithley 600B input mosfets

    As another bit of fun on our space's open day yesterday, I set up the 600B to measure the photoelectric current from a yellow LED. Under the lighting on our electronics bench I measured it at about 5 nA. I wouldn't recommend using them as small solar panels :-)
  14. (*steve*)

    Two appliances, Two switches, one switch to power one and second switch to power both???

    Yes, a 240V relay would do the trick. The first switch turns on the pump. In parallel with the switch you wire the normally open contacts of the relay. The second switch would turn on the fan. In parallel with the fan you place the coil of the 240V relay.
  15. (*steve*)

    Best way to detect what power source is connected?

    "stiff" means it can supply current without the voltage dropping. In this case the chip you plan to use has a charge pump to provide gate drive to the MOSFET. That will be about as stiff as a piece of cooked spaghetti. My initial thought was that you could probably use the gate signal to...
  16. (*steve*)

    Check My Bass Guitar Schematic?

    The image appears very slowly. However I can't understand it once it has downloaded.
  17. (*steve*)

    I have a question about a fan I built using a dc motor.

    Gigahertz is about 1,000,000,000 times more than is reasonable for those specs. I imagine the presence of the "g" was a typo somewhere.
  18. (*steve*)

    How to connect op amps in parallel

    This is typically and commonly achieved by capacitively coupling your signal to the mains. The inductance of the mains is quite high at higher frequencies due to the transformers from which it is fed. I'm not sure if the exact requirements for driving these signals, but a quick Google should...
  19. (*steve*)

    UV LED PCB Lithography Exposure Unit

    A colleague of mine is working on a similar device. Based on the datasheets of the material he is using, the LEDs are a better fit to the sensitivity of the film than UV florescent tubes.
  20. (*steve*)

    Best way to detect what power source is connected?

    There is no reason why you couldn't design a circuit to work in this manner. It's just in this case that it wasn't and the suggestion is made on the basis that the drive to the MOSFET gate is fairly "stiff". We don't know what the gate drive in your circuit is like, so it may not work. If we...
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