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'[EE]:Flash tubes - for Kat'
2001\10\23@214242 by Mathew cohen

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Kat,

If your are interested in some different types of flash lamps to play with
then there is a major lighting distributor here in Sydney where I am sure
you could buy some flash lamps from. May be not wholesale but if you are
looking for some lamps of larger rating. I previously worked for them as an
Technician. We sold and repaired Strobes up to 1500w. These strobes were
particularly useful for getting a sun tan from :-))
I would be suprised if phillips or osram do not sell a lamp to suit..
Let me know if I can be of assistance.

Mathew Cohen
spam_OUTmathewTakeThisOuTspameverythingit.net

Go to http://www.showtech.com.au have a look at the strobes they sell and they will
more than likely have spares for the fixtures..
Go to the pricelists - proshop - Geni -
They have a range of strobes






{Original Message removed}

2001\10\23@230116 by Kathy Quinlan

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Thanks Mathew,

I tried the Philips website, (yet to check osram) as one of my globe
wholesalers said If I can find a part # they can get it, but they have no
idea as they have steered clear of the area :o(

Regards,

Kat.

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----- Original Message -----
From: "Mathew cohen" <.....mathewKILLspamspam@spam@EVERYTHINGIT.NET>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Wednesday, October 24, 2001 9:11 AM
Subject: [EE]:Flash tubes - for Kat


> Kat,
>
> If your are interested in some different types of flash lamps to play with
> then there is a major lighting distributor here in Sydney where I am sure
> you could buy some flash lamps from. May be not wholesale but if you are
> looking for some lamps of larger rating. I previously worked for them as
an
> Technician. We sold and repaired Strobes up to 1500w. These strobes were
> particularly useful for getting a sun tan from :-))
> I would be suprised if phillips or osram do not sell a lamp to suit..
> Let me know if I can be of assistance.
>
> Mathew Cohen
> .....mathewKILLspamspam.....everythingit.net
>
> Go to http://www.showtech.com.au have a look at the strobes they sell and they
will
> more than likely have spares for the fixtures..
> Go to the pricelists - proshop - Geni -
> They have a range of strobes
>
>
>
>
>
>
> {Original Message removed}

2001\10\23@231806 by Jinx

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In an early ETI projects book there's a strobe using Circuit Component
MFT 1210 tubes. U-shaped that were fitted into an octal socket. Not
aware of Circuit Components in NZ, perhaps they're still around in Oz.
Possibly Oatley have something

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2001\10\24@011830 by David Duffy

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Jinx wrote:
>In an early ETI projects book there's a strobe using Circuit Component
>MFT 1210 tubes. U-shaped that were fitted into an octal socket. Not
>aware of Circuit Components in NZ, perhaps they're still around in Oz.
>Possibly Oatley have something

IIRC, they were the same as the DSE ones, or was it a larger tube?
Regards...

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2001\10\24@030720 by Jinx

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> IIRC, they were the same as the DSE ones, or was it a larger tube?
> Regards...

You could be right. I can't say which is used in the project but both
must be able to fit in the octal socket and then into the reflector

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2001\10\24@032433 by David Duffy

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At 07:58 PM 24/10/2001 +1300, you wrote:
> > IIRC, they were the same as the DSE ones, or was it a larger tube?
> > Regards...
>
>You could be right. I can't say which is used in the project but both
>must be able to fit in the octal socket and then into the reflector

I know the project you mean. It had 2 of the DSE type U shaped tubes.
From memory, it used 2x 6.5uF capacitors to fire each tube. I would
possibly have the circuit around here somewhere if you need it.
Regards...

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2001\10\24@042123 by Jinx

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> I know the project you mean. It had 2 of the DSE type U shaped tubes.
>  From memory, it used 2x 6.5uF capacitors to fire each tube. I would
> possibly have the circuit around here somewhere if you need it.
> Regards...

Got it in ETI Top Projects 6 thanks David. In fact I uploaded it during
the NiCd zapper thread just before my PC went belly up

http://home.clear.net.nz/pages/joecolquitt/NiCdzap.html

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2001\10\24@054006 by Kathy Quinlan

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Now I remember the ETI project, thanks Dave lol, yes it uses 2 u tubes, it
also had 4 x 6.5uF polly caps.

I have the schematics in a folder, I built 100's of these for friends
(literally, must have supplied all of Perth) the DSE version was nice as it
has all metal case. the Altronic version had an ABS box with the aluminium
box on the top or a wooden box with the reflector mounted inside.

Regards,

Kat.
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{Original Message removed}

2001\10\24@054452 by Kathy Quinlan

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Their was also a version Jinx, that had a second 820R current limiter, a
second set of caps and a second tube :o)

Also a later mod was to add audio beat triggering or an automatic 555 timer
operation.


Regards,

Kat.

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{Original Message removed}

2001\10\24@060616 by Jinx

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There's an A5 data sheet that comes with the DSE tube. Includes specs
and general circuit and also this, which is new to me. "Although flash
tubes will operate when connected either cathode or anode to ground,
they do work more efficiently when wired correctly so that its cathode
is "tied" to ground"

In the circuit they have, they show the tube as having a red spot on the
anode. The ones I have don't got no spots, but one terminal's glass is
silvered and has a larger coil. That is discernable in the diagram as
the cathode, but I hadn't realised that tubes are polarised. Surely not ?

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2001\10\24@064213 by Kathy Quinlan

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Hiya Jinx,

On low powered flash tubes I believe it does not matter too much, BUT on
high powered yes it does.

When the arc starts, it starts with a fair force, which lifts parts of the
coating off the Cathode, and deposits this on the anode and the tube body.
If you use the anode, you quickly start to burn it away.

Regards,

Kat.

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{Original Message removed}

2001\10\24@075510 by Jinx

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> On low powered flash tubes I believe it does not matter too much,
> BUT on high powered yes it does

So, as ETI did, add an extra tube for more light rather than dump
more power through just one, same as parallel transistors in power
stages. Use the minimum power through each device to achieve
the desired result

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2001\10\24@082005 by Kathy Quinlan

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Hi Jinx.

You got it, as a bigger tube is alot more money (so they will tell you) in
reality it is hard to find 450VDC caps with enough uF's cheap enough for
hobby use :o(

My current design is Uc controlled with a regulated voltage doubler giving
me between 300 - 500VDC to vary flash intensity. I am also signalling
failures (I am still trying to work out how to detect the unit blew its self
off the wall ;o) atm I have 6 X 450V 200uF caps and they are rated at 105oC
and the ambient outside temp during summer will be 50oC with out taking in
to account they will be sitting in the sun :o(


Regards,

Kat.

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{Original Message removed}

2001\10\24@083931 by Jinx

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> off the wall ;o) atm I have 6 X 450V 200uF caps and they are rated
> at 105oC and the ambient outside temp during summer will be 50oC
> with out taking in to account they will be sitting in the sun :o(

If I hear a big big bang from the distant west and several minutes later
see pieces of low-flying Kat............

For the time being with mine I'll use just 1u out of the spares box. See
how it goes. I've got a couple of 22u I might try later. If you hear a big
big bang from the distant east and sevral minutes later see pieces of
low-flying Jinx..................

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