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  1. KJ6EAD

    PCB Cleaning after Soldering

    More importantly, it will evaporate it completely so no hidden pocket of liquid trapped in or under a component can cause a thin spot or bubble in the conformal coating.
  2. KJ6EAD

    Cooling alternatives for a TEG

    Ironically, anything you use to cool the peltier that's in the room you're heating will become less effective as the room warms. An insulated duct to outside air may be a viable option if the stove is close to an outside wall but normally stoves are positioned near the center of the room. By...
  3. KJ6EAD

    PCB Cleaning after Soldering

    Use whatever flux removal method works with your flux, including mechanical action such as brushing. This may be a water based process or other. Follow any water rinses with compressed air then alcohol to scavenge the remaining water. Blow off again and bake in a low temperature oven.
  4. KJ6EAD

    Battery Bank

    You skipped over the decision to buy or build. I am using one of these right now and can recommend them, but only if you need all of their features. If not, you can get a similar Watt hour rating for less money with only a 5V USB output and a single charging voltage. Then again, if you don't...
  5. KJ6EAD

    Help with finding a resistor to drop 220v to 110v

    Ken, you have a little unit typo (0.0012A or 1.2mA).
  6. KJ6EAD

    Help Identifying a Diode

    The logo is Toshiba, for what it's worth.
  7. KJ6EAD

    Christmas mini light voltage

    Typically the bulbs are 6V each, wired in series strings of 20 bulbs that are then paralleled into a common plug, however, there are some lower voltage exceptions. It's almost never worth the time and trouble to repair those but if you do, use one string as a supply of spare bulbs instead of...
  8. KJ6EAD

    Enclosure for a project?

    Google electronic enclosures and companies like Hammond, Bud, Serpac and Okwen immediately appear. For seemingly random hole locations, either stand offs through the case floor or on an adapter plate are the usual methods.
  9. KJ6EAD

    Help for hooking radio speaker to 3.5mm headphone jack

    You have a few issues to deal with. The phone output is designed to drive two channels of a high impedance, low power load such as earbuds, not a single low impedance speaker. However, if connected correctly to one of the channel outputs, you should be able to hear a small volume of sound from...
  10. KJ6EAD

    a newbie question about the soldering station.

    I use a Hakko 936 at home. It's the predecessor to the FX-888 even though they look different. I use Weller WESD51's at work. Performance is similar but I'd opt for the Hakko because it has a higher wattage, a better iron holder and it's handpiece (FX-8801) doesn't eventually melt like the...
  11. KJ6EAD

    Fun and games with autotransformers

    So it's a typical power transformer with a multitap primary to accommodate various input line voltages and multiple secondaries? What's unusual?
  12. KJ6EAD

    Alarm when handbag opens accidentally

    I never said anything about theft, nor did you in your original post so I'm having some difficulty with your use of language. It would help at this point to understand what kind of opening and closure device the bag has. While it's certainly possible to install some kind of sensor or switch to...
  13. KJ6EAD

    Alarm when handbag opens accidentally

    How would an audible alarm or even a vibratory one prevent unwanted handbag dumping?
  14. KJ6EAD

    12V ride on car help needed

    It's probably an automatically resettable thermal fuse similar to this: http://www.digikey.com/product-detail/en/1610-92-15A/302-1243-ND/509845 These are used in cars to protect wiring and small motors such as windshield wiper or window operator types. They have a bimetallic element so they...
  15. KJ6EAD

    12V ride on car help needed

    Your picture is out of focus but it's not a relay; that would require at least three terminals. It may be some kind of circuit breaker or fuse. Can you test continuity between the terminals?
  16. KJ6EAD

    Help with Intercom Circuit

    Well, you have no power shown. I imagine that could lead to some disappointment were you to build it as shown. :oops:
  17. KJ6EAD

    Can anyone here tell what this is called?

    Again, that's not a switch, just a custom actuator for a switch. Are you looking for an exact replacement (unlikely to be found) or designing something new? By the way, Fry's in Roseville or North Highlands or Metro Electronics in Sacramento may have a few tactile switches that you can look at...
  18. KJ6EAD

    Can anyone here tell what this is called?

    That's just the actuator. The switch is probably some form of tactile switch. Does this look useful? https://www.e-switch.com/product-catalog/tact/product-lines/tl3700-series-ultra-miniature-micro-tact-switch-smt#.VF4t8TmDSBY
  19. KJ6EAD

    Wanted: Obsolete Component LED Rectangular Light Bars

    Those LEDs look like ones made by Dialight in the 70's or 80's. http://www.dialight.com
  20. KJ6EAD

    Opening jigsaw electronics unit-potentiometer

    Units like that are not designed to be disassembled or repaired, just replaced. If you really want to try opening it, be prepared to unsolder completely and cleanly any exposed solder joints, untwist metal tabs without breaking them and drill out rivets or peened tubes and have a way to refasten...
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