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  1. KJ6EAD

    Need help with remote firework detonator

    What radios are you using? If you're using FM FRS or GMRS types you can use their CTCSS squelch system in conjunction with a DTMF at both ends to give you some noise and false trigger immunity.
  2. KJ6EAD

    extreme noob question

    2M resistors are readily available. http://www.mouser.com/Mobile/Passive-Components/Resistors/Through-Hole-Resistors/Carbon-Film-Resistors/_/N-7h7z9/?P=1z0vkoo
  3. KJ6EAD

    Finding a sensitive weight/force sensor

    These can measure your pulse while you're standing on them. http://www.pasco.com/products/probeware/sensors/pasport/index.cfm
  4. KJ6EAD

    How to strip the insulation off 3 core main cables?

    This is what I use: http://www.gardnerbender.com/en/grx-3224
  5. KJ6EAD

    Faston/ Blade Connectors

    Maybe the low insertion force connector crimped to test lead cable with an overmolded grip to protect the crimp can work. It wouldn't surprise me if E-Z Hook made exactly what you need but you'd have to ask them since it's not in their catalog. http://www.e-z-hook.com/
  6. KJ6EAD

    Faston/ Blade Connectors

    Panduit and Ideal are the best quality I've seen. There is another type where the socket is sprung instead of just dependent on friction from a curled bit of metal. I'll see if I can find it for you. Here's one: Page 12 in this catalog has low insertion force female disconnects in bronze and...
  7. KJ6EAD

    color organ

    Have you tried any of these Toronto area sources? http://www.active123.com/ http://www.activesurplus.ca/mobile/en/
  8. KJ6EAD

    Help in explain schematic

    In both cases, the current sense resistor networks appear to be in series with the ground leg of the source or load. That seems reasonable.
  9. KJ6EAD

    LED Identification

    I knew they were 2 strips. Oops, I used the wrong resistor values (620Ω and 680Ω) and an assumed Vf of 3V for each of 3 LEDs to conclude that they were circuited for 24V but if the resistors are 62Ω and 68Ω as they appear to be, Steve is right. You could connect a section and measure the...
  10. KJ6EAD

    LED Identification

    Yes. Just not nearly as bright on 12V.
  11. KJ6EAD

    New to electronics, 555 help

    How do you know your input voltage is the correct polarity; did you test with a meter or just rely on wire color?
  12. KJ6EAD

    LED Identification

    They are designed to work on 24VDC and are grouped in sections of 3 LEDs with a dropping resistor so the current requirement will be approximately 20mA X the number of sections bussed together in parallel or 4A for 5m length (about 100W per 5m). http://www.superbrightleds.com/ or ebay.
  13. KJ6EAD

    LED Strip Around a frame

    See this post for a description of your strip but keep in mind that some strips are made for 24V: https://www.electronicspoint.com/forum/showthread.php?p=1464604
  14. KJ6EAD

    Testing 555 timers

    Connecting them in reverse polarity always does.
  15. KJ6EAD

    Testing 555 timers

    Three possibilities come to mind; your supply voltage is too high, the power is connected in reverse polarity or the load resistance is too low. It could be a combination of factors. Has the circuit ever worked?
  16. KJ6EAD

    Identifying Cracked Diode on Mecedes Key Fob

    Radio Shack will have a 1N4148 which is the leaded version of the LL4148. You can make one fit.
  17. KJ6EAD

    Total newbie with stupid questions

    I can't make it simpler. Use LEDs instead of incandescent lamps or design with all lamps at one voltage or set up multiple voltages with regulators or set up multiple battery packs.
  18. KJ6EAD

    Simple LED circuit

    If the switch has more than two terminals, you could have it wired incorrectly.
  19. KJ6EAD

    Help with identify component (extra small)

    Your meter has capacitance measurement capability. Read the manual to find out how to use it.
  20. KJ6EAD

    Total newbie with stupid questions

    If you don't need the portability of batteries, consider using AC/DC adapters (plug pack, wall wart, etc.) To supply the low voltage DC you need. If you're trying to power a panel of surplus indicators, you may need a few to create buses of different voltages (28, 24, 12, 6, etc.).
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