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  1. KJ6EAD

    Airwick Freshmatic Max unit

    I'd try to measure the capacitance of C1, then piggyback a second capacitor of same size and capacitance beside it, effectively doubling the value and hopefully the time period of all settings. If that doesn't work, you would need to program your own PIC chip and install it.
  2. KJ6EAD

    Airwick Freshmatic Max unit

    Your upload is not good. Only a 700 byte thumbnail appears! It's likely your device uses a COB circuit like the one Clive showed. If it has an exposed timing capacitor or resistor, you could replace one or both to affect the modification you desire, otherwise you'll have to replace the entire...
  3. KJ6EAD

    Will this purchased adaptor be okay?

    FYI, those barrel plugs have two typical lengths, ~9mm and ~11mm. You apparently have a 9mm jack and an 11mm plug but it's usually not a problem having a longer plug unless it's subjected to levering force.
  4. KJ6EAD

    Help, Please with hot wire foam cutter

    Does the DROK meter not have an instantaneous wattage indication? Mine does.
  5. KJ6EAD

    Forum Category Feedback

    Category heading spelling check. Questions is spelled thusly. :p
  6. KJ6EAD

    Anyone know where I can buy one of thes buttons?

    It's a nurse call switch. Similar products are made by many companies. It's very unlikely that you can buy the exact type as a subassembly due to the manufacturer's fear of litigation. You could try searching for pendant switches but most will be large industrial units and the smaller ones are...
  7. KJ6EAD

    xmas present: blinking ring

    The required form factor, a child-sized ring for a finger makes any DIY option extremely difficult. How about a bracelet?
  8. KJ6EAD

    xmas present: blinking ring

    Something like a neopixel ring would be nice but it's not very child friendly and requires significant power. https://www.adafruit.com/products/1643?gclid=Cj0KEQiAx7XBBRCdyNOw6PLHrYABEiQAJtyEQ-NNBUFe74tX0U-bNbXSpeXL4L8m9dJAskGJm5oB7kEaAtyR8P8HAQ
  9. KJ6EAD

    Help repairing several Reconyx trail cameras

    The problems you describe are not likely to be economically repairable, even for an experienced technician.
  10. KJ6EAD

    Double Action switch repair

    It looks like a standard tactile switch. A lot of cameras have two contact steps; a half press to lock exposure and focus and a full press to actuate the shutter. Does yours do that?
  11. KJ6EAD

    Need help determining what kind of fuse this is?

    VW-1 is just a fire retardant rating for the sleeving. Usually the fuse ratings are stamped on the metal ferrules.
  12. KJ6EAD

    Volume knob, Roberts radio, intermittent failure

    This is a typical failure for a well-used radio. The cleaning may help temporarily but a replacement will be the long-term solution. You'll need all of the dimensions, the value and the taper type to source it.
  13. KJ6EAD

    LED Specs

    18,000 millicandelas @ 30° = 3.854 lumens 20,000 millicandelas @ 15° = 1.075 lumens http://led.linear1.org/lumen.wiz
  14. KJ6EAD

    Testing mAh of a battery?

    The meter I suggested can do that measurement for you. Start with a completely discharged phone, plug the meter and charger in and read the mAh from the meter when the phone reaches a fully charged state.
  15. KJ6EAD

    Testing mAh of a battery?

    If you're only testing USB output power banks, a meter like the one shown in your ebay link can work but as Hellas mentioned, the results are only meaningful if the load is known or controlled. This is the best one I've found and used...
  16. KJ6EAD

    Multisim - How do I find the Resonant Frequency (FR) on an LRC circuit?

    Make sure the frequency step is small enough as well. Probably 1Hz would look good.
  17. KJ6EAD

    Intercom replacement questions.

    Based on the legends on the boards and wire colors, it looks like you just need to move the black wire to the "B" terminal on the new board. Everything else looks correct.
  18. KJ6EAD

    Multisim - How do I find the Resonant Frequency (FR) on an LRC circuit?

    The bode plotter in multisim works well for this kind of exercise.
  19. KJ6EAD

    Looking for advice for an LED flag project

    The datasheet has a graph of relative luminous intensity (no units) vs current but most people just hook up a potentiometer and dial-a-brightness by eye, then record the current and the resistance that achieved it with a fixed voltage supply. I try to string 6 or more in series to do this so I...
  20. KJ6EAD

    Looking for advice for an LED flag project

    The LED datasheet has a graph showing the relationship between current and luminance but most people just hook up a sample to a potentiometer and dial-a-brightness by eye, then measure the current, voltage and resistance that has the desired look.
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