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  1. KJ6EAD

    MAKE: Experiment 4

    Review the information regarding measurement of DC current on pages 25-27 and fuse replacement information on page 32 of your meter manual. There are some warnings not to connect the meter in parallel with a voltage source. This is how you blew the fuse. The genius(es) that wrote the meter...
  2. KJ6EAD

    Three wirre electret microphone

    The Wikipedia article covers it. http://en.m.wikipedia.org/wiki/Electret_microphone
  3. KJ6EAD

    MAKE: Experiment 4

    I know Steve. You did pretty good figuring out the intent of the experiment with minimal clues. Nyan, you should get some spare fuses for your meter (5mm X 20mm 315mA). You'll need them eventually if not now. Littelfuse 216 is a good model as is Buss S501.
  4. KJ6EAD

    MAKE: Experiment 4

    If you're using the 6V battery pack, 1k fixed resistor and 2k potentiometer the experiment prescribes, your current readings should range from 2mA to 6mA or a little less as your batteries weaken. It would help if you would include any relevant figures when you ask these questions. For example...
  5. KJ6EAD

    DIY emergency battery charger

    http://adafruit.com/products/14
  6. KJ6EAD

    DIY emergency battery charger

    That Australian site seems to be down. This is the same or similar product. http://www.dimensionengineering.com/products/de-sw050 The input can be 6.3V-30V. An 8-pack of AA cells, even rechargeables would work well with the switcher.
  7. KJ6EAD

    mini jack socket with 3 pins

    Find a model, check the dimensions on the data sheet, then check Digikey or Mouser, etc. for stock. http://www.cui.com/Catalog/Components/Connectors/Audio_Connectors/3.5_mm_Audio_Jacks Most stereo jacks have built-in switches (5 pins). If your jack has 3 it could be mono or just a less common...
  8. KJ6EAD

    DIY emergency battery charger

    It's safe but inefficient, especially using a 9V battery. How about using an 8-cell holder full of AA cells?
  9. KJ6EAD

    LED Flasher Relay Flash Rate

    If you can speed it up, you can slow it down; an adjunct to John's post #4. Another trick you can use to identify the timing resistor is to add another resistor in parallel which should speed the timing up noticeably when connected to the correct resistor. The advantage is that you can do this...
  10. KJ6EAD

    Question about wiring DC input into boombox

    Doesn't the boom box have a coaxial DC input jack?
  11. KJ6EAD

    Using a piezo as a vibration sensor

    Jeri Ellsworth made a guitar of sorts using piezo transducers as pickups. Maybe you can glean something from her video.
  12. KJ6EAD

    Solderable paint?

    A solvent-thinned epoxy with surface applied copper powder or flake may work.
  13. KJ6EAD

    Solderable paint?

    This probably won't help but a typical industrial process involves a molybdenum and powdered glass paint applied to a glass or ceramic surface which is then fired in an inert gas filled kiln to burn off the binders in the paint leaving a glass/molybdenum matrix which can be plated with nickel or...
  14. KJ6EAD

    Help finding somewhere to buy a component

    It might be something in this line. http://www.molex.com/molex/products/family?key=kk&channel=products&chanName=family&pageTitle=Introduction
  15. KJ6EAD

    Onan control board

    No, you're good for now.
  16. KJ6EAD

    Need some help to ID what this component is

    There shouldn't be. The liquid residue doesn't look like capacitor electrolyte but I'd be looking real hard for a blown bottom vent anyway. From the extent of residue coverage, either the board was vertical or the liquid came from an outside source, maybe a cat or dog that doesn't like the radio...
  17. KJ6EAD

    Onan control board

    It's still possible there are other faults. I would have liked to test that bridge rectifier under the heat sink, for example. Don't underestimate the deleterious effects of corroded connectors. They should be thoroughly cleaned or replaced.
  18. KJ6EAD

    Need some help to ID what this component is

    It could be a 2-lead resonator. http://www.oscilent.com/spec_pages/Resonators/R-630.html
  19. KJ6EAD

    Need some help to ID what this component is

    450kHz for the AM IF on pin 18 of the BA1450S.
  20. KJ6EAD

    Electronics n00b, how does this circuit function?

    The article that accompanied your schematic explained it's function fairly well. http://gilmore2.chem.northwestern.edu/projects/equal_prj.htm
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