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  1. (*steve*)

    One battery, four circuits

    In that case, it sounds like you have a battery and a switch in one box, with 4 cables, each one running from one end of the battery and the switch to each of the controllers. Make sure the power switch can handle 28A.
  2. (*steve*)

    Phantom powered preamp

    yeah, I'm looking at an NE5534 with a differential input as the gain stage driving a phase splitter (using a jfet) to drive the differential output (a Schoeps circuit). I'll be using a TL071 (probably) to create a 0V rail. Another alternative is to create my own differential input stage (and I...
  3. (*steve*)

    One battery, four circuits

    Just run separate power connections from each controller back to the power supply. Make sure the power supply can handle it if all 4 are operated simultaneously. Or are you talking about 4 controllers in one box? In that case run the power to the box and split off the 4 power connections in...
  4. (*steve*)

    Phantom powered preamp

    I thank people for their responses. I do have the equipment to measure noise, frequency response, the, gain, etc., so I won't be flying blind here. :) Also, the equipment providing the phantom power is professional equipment, and as I said, I already use the phantom power for one microphone...
  5. (*steve*)

    Can Crusher - High School Physics Porject

    Ok, I was the one responsible for banning the operation of such a device at our hackerspace until it was made safe (ish). Things that were done include: Enclosing the device Adding a beacon to indicate power is on Permanently connected bleed resistors which will discharge the caps to a safe...
  6. (*steve*)

    Can Crusher - High School Physics Porject

    I have a can on my desk at work that was partially crushed by the sort of thing you describe. The device is known as "Box-o-bangs" and has other interesting attributes like holding a deadly charge. Not the sort of thing I'd have around kids.
  7. (*steve*)

    Use Arduino & 2 Switches to Turn LED on and off

    You are advertising your own web site. As a moderator I can see the post which was deleted when you did this last time. If someone asks a question for which this is an answer then you could post it. As it is, the link was pretty useless because it didn't give the code, and there are some...
  8. (*steve*)

    Use Arduino & 2 Switches to Turn LED on and off

    If that was your first post you would have been banned for spamming... In fact, you have previously been warned about this. Did you forget?
  9. (*steve*)

    Phantom powered preamp

    I'm after a preamp which runs from phantom power. I have 2 microphones, one of which requires phantom power, the other which won't work with phantom power turned on. The mixer turns on and off phantom power simultaneously for all mic inputs :) The microphone which doesn't like phantom power...
  10. (*steve*)

    Noob question about multimeters

    Put it on the Ω X1 scale (at about 3 O'Clock position. Touch the metal parts of the probes together and the meter should swing to the right. Use the Ω 0 knob in the top left corner to adjust the meter to read zero on the green scale. If the meter can't be adjusted to this position then you...
  11. (*steve*)

    Making Lead-Acid Style Batteries (With Alum / Epsom Salt)

    A chemistry forum would probably be able to give you the sort of advice you need.
  12. (*steve*)

    Ultra Low System Clock Speed for FCC Compliance

    If you can tolerate slower rising and falling edges you'll reduce possible problems too.
  13. (*steve*)

    Anything you wish you knew/glad you knew at the start of your education and/or jobs?

    What you study may influence what you do next, but it doesn't determine where you end up.
  14. (*steve*)

    K40 Laser Cutter Upgrades

    The quick check is to remove the lens and ensure that the beam is in the middle of the lens tube at various positions on the bed (the four corners and the middle is what I use).
  15. (*steve*)

    K40 Laser Cutter Upgrades

    I presume you know how to check that the laser is actually hitting the centre of the mirrors and the centre of the lens. If it's hitting the edge of the lens you can end up with coma. And that's the effect that you maybe describing.
  16. (*steve*)

    K40 Laser Cutter Upgrades

    The blast of air (air assist) blows smoke out of the way so the laser isn't attenuated Oxidises the material Cools the lens and protects it from smoke and debris Cools the workpiece. Depending on what you're doing, some will be more significant than others. Number 2 is important for metal...
  17. (*steve*)

    2 volt regulator

    Take a look here. That will tell you all you need to know without hyperbole. If your 17V is reasonably stable you should be able to put 3 or 4 LEDs in series with a single resistor and then just repeat that for as many LEDs as you require.
  18. (*steve*)

    K40 Laser Cutter Upgrades

    The shadowing looks like smoke to me. Air assist will reduce this a lot. Simplest best cut sold be at 100% power and with a feedrate as fast as possible so that the material just cuts through. Let's say that is 100% @ 20mm/s for 3mm ply. You can get a slightly better cut with 2 passes at...
  19. (*steve*)

    2 volt regulator

    So, are you guessing, or do you have other information that you're deliberately withholding? Either way... not very helpful.
  20. (*steve*)

    2 volt regulator

    Do you mean regulators that will produce an output of 2 volts, work with a differential voltage of 2 volts, or work with an input voltage of 2 volts?
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