Electronic ballast for fluorescent lamps

Hi,
I am looking for an electronic ballast which
could drive 8W fluorescent lamp(s) (UVA tube).

I found some electrical schemes on the web, but
I wasn't be able to find the suitable transformer.

Can someone tell me about a good ballast design,
please?

Thank you and regards.

On Mon, 5 Feb 2007 11:11:52 +0100, in sci.electronics.design "SBS"
<(E-Mail Removed)> wrote:

>Hi,
> I am looking for an electronic ballast which
>could drive 8W fluorescent lamp(s) (UVA tube).
>
>I found some electrical schemes on the web, but
>I wasn't be able to find the suitable transformer.
>
>Can someone tell me about a good ballast design,
>please?
>
>Thank you and regards.
>
You will probably have to have the transformer custom wound, which is
normally no big deal

Loads of stuff here
http://www.irf.com/product-info/lighting/


martin

"SBS" <(E-Mail Removed)> schreef in bericht
news:45c703b6$0$31680$(E-Mail Removed) ...
> Hi,
> I am looking for an electronic ballast which
> could drive 8W fluorescent lamp(s) (UVA tube).
>
> I found some electrical schemes on the web, but
> I wasn't be able to find the suitable transformer.
>
> Can someone tell me about a good ballast design,
> please?
>
> Thank you and regards.
>
>

You can drive an 8W fluorescent lamp with a simple circuit that requires no
coil or transformer.
http://www.repairfaq.org/sam/linefl.gif

petrus bitbyter

petrus bitbyter ((E-Mail Removed)) ha scritto:

::: I am looking for an electronic ballast which
::: could drive 8W fluorescent lamp(s) (UVA tube).

:: You can drive an 8W fluorescent lamp with a simple
:: circuit that requires no coil or transformer.
:: http://www.repairfaq.org/sam/linefl.gif

Thank you veru much. Is it safe for my fluorescent tubes?

Regards.

"SBS" <(E-Mail Removed)> schreef in bericht
news:45c72973$0$31670$(E-Mail Removed) ...
> petrus bitbyter ((E-Mail Removed)) ha scritto:
>
> ::: I am looking for an electronic ballast which
> ::: could drive 8W fluorescent lamp(s) (UVA tube).
>
> :: You can drive an 8W fluorescent lamp with a simple
> :: circuit that requires no coil or transformer.
> :: http://www.repairfaq.org/sam/linefl.gif
>
> Thank you veru much. Is it safe for my fluorescent tubes?
>
> Regards.
>
>


Guess so. I build one and it works fine. A friend of mine has an inpection
light with similar circuit. Worked fine as well untill it fell too hard one
time. (This broke the tube and the enclosure, not the electronics. I checked
it out by myself.) Some say the lifetime of the tube will decrease. Maybe
true, but I've had no problems so far. The only drawback is some more
flicker compared to a conventional ballast, so it may not be a succes as a
reading lamp. I also experimented with the electronics of a worn out
electricity-saving lamp. A 8W tube works really fine on the electronics of
such a 9W lamp. If you google around, you will also find some sites dealing
with this things.

petrus bitbyter

On 5 Feb, 12:28, "petrus bitbyter"
<pieterkraltlaatdit...@enditookhccnet.nl> wrote:
> "SBS" <no.s...@grazie.da.me> schreef in berichtnews:45c703b6$0$31680$(E-Mail Removed) .tin.it...
>
> > Hi,
> > I am looking for an electronic ballast which
> > could drive 8W fluorescent lamp(s) (UVA tube).
>
> > I found some electrical schemes on the web, but
> > I wasn't be able to find the suitable transformer.
>
> > Can someone tell me about a good ballast design,
> > please?
>
> > Thank you and regards.
>
> You can drive an 8W fluorescent lamp with a simple circuit that requires no
> coil or transformer.http://www.repairfaq.org/sam/linefl.gif
>

This circuit looks like a typical 'play around with lots of components
but ensure you do not know anything about what you are doing' type
circuit.
On 220V ac a single series cap will work as a ballast. Since many (but
not all) 8W T5 tubes's, at room temp, will begin to arc as low as 250V
- that is all that is needed.
>From memory the arc is run at around 50V for a T5 8 watt.
With a capacitive ballast the crest factor is appalling, the cathodes
will be stripped etc, life and output reduced. That is why it is not
used.

Why do you need an 'electronic' ballast?
What is the advantage of an electronic ballast in your application -
size, thermals,..... ??

RHRRC ((E-Mail Removed)) ha scritto:

:: Why do you need an 'electronic' ballast?
:: What is the advantage of an electronic ballast in your
:: application - size, thermals,..... ??

I need an electronic ballast because I want to reduce
size and weight of the resulting device I am building.

Petrus suggested me to use the electronics of an energy
saving lamp with about same power consumption of
the fluorescent tube I have to use. Other experience
with electronic ballast from energy saving lamp?

"RHRRC" <(E-Mail Removed)> schreef in bericht
news:(E-Mail Removed) ups.com...
> On 5 Feb, 12:28, "petrus bitbyter"
> <pieterkraltlaatdit...@enditookhccnet.nl> wrote:
>> "SBS" <no.s...@grazie.da.me> schreef in
>> berichtnews:45c703b6$0$31680$(E-Mail Removed) .tin.it...
>>
>> > Hi,
>> > I am looking for an electronic ballast which
>> > could drive 8W fluorescent lamp(s) (UVA tube).
>>
>> > I found some electrical schemes on the web, but
>> > I wasn't be able to find the suitable transformer.
>>
>> > Can someone tell me about a good ballast design,
>> > please?
>>
>> > Thank you and regards.
>>
>> You can drive an 8W fluorescent lamp with a simple circuit that requires
>> no
>> coil or transformer.http://www.repairfaq.org/sam/linefl.gif
>>
>
> This circuit looks like a typical 'play around with lots of components
> but ensure you do not know anything about what you are doing' type
> circuit.
> On 220V ac a single series cap will work as a ballast. Since many (but
> not all) 8W T5 tubes's, at room temp, will begin to arc as low as 250V
> - that is all that is needed.
>>From memory the arc is run at around 50V for a T5 8 watt.
> With a capacitive ballast the crest factor is appalling, the cathodes
> will be stripped etc, life and output reduced. That is why it is not
> used.
>
> Why do you need an 'electronic' ballast?
> What is the advantage of an electronic ballast in your application -
> size, thermals,..... ??
>
>

Well, I neither designed nor analysed the circuit but if you want to...

A lot of circuits of commercial available electricity-saving lamps can be
found on:
http://pavouk.comp.cz/index.html
That guy Pavouk dissected a lot of them.

Another experiment:
http://tacashi.tripod.com/elctrncs/i...r/inverter.htm

I myself use the electronics of a 20W electricity-saving lamp to drive a
circline 22W tube. Even works with some older tubes that did not start on
the original - classic - ballast anymore. (Which was the main reason to drop
the old ballast. Tubes became useless much too fast.)

You can buy an electronic ballast as well. Conrad for example sells them:
http://www1.conrad.de/ (German)
Look for partnr. 571449 - 89

petrus bitbyter

petrus bitbyter wrote:
> "SBS" <(E-Mail Removed)> schreef in bericht
> news:45c72973$0$31670$(E-Mail Removed) ...
>
>>petrus bitbyter ((E-Mail Removed)) ha scritto:
>>
>>::: I am looking for an electronic ballast which
>>::: could drive 8W fluorescent lamp(s) (UVA tube).
>>
>>:: You can drive an 8W fluorescent lamp with a simple
>>:: circuit that requires no coil or transformer.
>>:: http://www.repairfaq.org/sam/linefl.gif
>>
>>Thank you veru much. Is it safe for my fluorescent tubes?
>>
>>Regards.
>>
>>
>
>
>
> Guess so. I build one and it works fine. A friend of mine has an inpection
> light with similar circuit. Worked fine as well untill it fell too hard one
> time. (This broke the tube and the enclosure, not the electronics. I checked
> it out by myself.) Some say the lifetime of the tube will decrease. Maybe
> true, but I've had no problems so far. The only drawback is some more
> flicker compared to a conventional ballast, so it may not be a succes as a
> reading lamp. I also experimented with the electronics of a worn out
> electricity-saving lamp. A 8W tube works really fine on the electronics of
> such a 9W lamp. If you google around, you will also find some sites dealing
> with this things.
>
> petrus bitbyter
>
>
Been running a normal 8W tube off a ballast from a 9W lamp on our boat
for the last year. Must have close to 500 hours running time now with no
problems whatsoever. Its far cheaper than you can build it, even buying
a decent quality energy saving lamp new.


--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- &
[dot]=.
*Warning* SPAM TRAP set in header, Use email address in sig. if you must.

SBS wrote:
>
> Hi,
> I am looking for an electronic ballast which
> could drive 8W fluorescent lamp(s) (UVA tube).
>
> I found some electrical schemes on the web, but
> I wasn't be able to find the suitable transformer.
>
> Can someone tell me about a good ballast design,
> please?
>
> Thank you and regards.

Maybe the folks on sci.engr.lighting have some ideas.

You might want to provide some additional info. like lamp part number,
supply voltage, etc.

--
Paul Hovnanian private.php?do=newpm&u=
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