Homebrew PCBs

With only two pins it is going to be of the cold start type using high
voltage instead of heated filaments.

I expect it won't start with a regular ballast.

ST

On Thu, Nov 3, 2011 at 5:05 PM, Benjamin Blumer <b3nzilla@gmail.com> wrote:
> Just to confirm -- the U-shaped bulb I'm using has only one set of pins. Do
> I use two pins on the lamp that are or that are not connected?
>
>
> Thanks!
>
>
>
> On 2011-11-03, at 12:06 AM, Larry Battraw <lbattraw@...> wrote:
>
>
>
> On Wed, Nov 2, 2011 at 5:15 PM, b3nzilla <b3nzilla@...> wrote:
>
>> **
>>
>>
>> Hi all,
>>
>> After many hard-fought battles with different inkjet printers, I've
>> decided to try using the UV method with negative photoresist.
>>
>> I'm wondering if anyone knows enough about the operation of UV ballasts to
>> offer advice:
>> I have an old lamp designed to take short, straight fluorescent tunes with
>> ballasts on each end (4 pins in total). I'm wondering if that lamp will be
>> compatible with this U-shaped bug killing bulb:
>>
> http://www.homedepot.ca/product/ultraviolet-replacement-bulb-for-bk-80acan-insect-killer/945544
> . Of course I'll make sure it fits, but I'm wondering if it's
>> electronically compatible.
>>
>
> Yes, it should be fine providing you get the filaments connected correctly
> (i.e. you need to connect one filament to one side, and vice-versa). You
> can check with an ohm-meter for a filament connection to determine a pair
> of pins to connect to one side and then use the other pair for the other
> side. Sorry if I'm not explaining this clearly but you need to make sure
> that you don't cross-connect the pins of the ballast since it could damage
> it. The only other thing to check for is the wattage of the ballast and
> the bulb you're using. Generally you can use a larger-sized (Within
> 25-50%) ballast for a smaller tube but not the other way around since
> ballasts tend to run hot anyway.
>
>>
>> From the fluorescent-light Wikipedia page, I'm having a hard time figuring
>> out if the operation on both ends is symmetric.
>>
>> Yes, operation is symmetric since the tube is fed on AC and has no
> polarity. Each tube end has an identical heater filament to connect to one
> half of the ballast. If your existing ballast won't work for you there's
> always the possibility of buying a proper ballast (And if not integrated,
> an igniter) and soldering directly to the tube instead of fooling around
> with flaky connectors. You're very unlikely use the light enough to need
> to replace it anyway (I've had the same lights for years and only replaced
> them when I accidentally broke them). I would recommend using at least two
> of the U-shaped bulbs to get enough light to provide an even light
> distribution at an appropriate distance.
>
> Regards,
> Larry
>
>> __.__Y
>>
>
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