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#127435 - 07/11/01 02:21 PM ballast xfmer
habbbby Offline
Member
Registered: 05/27/01
Posts: 17
Loc: Loysvile, PA
Is there a schematic here somewhere of a flor. ballast, two lamp. Two red, two blue and two yellow, with of course the feed. Iam curious as to how the coils are layed out internally.
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#127436 - 07/11/01 02:37 PM Re: ballast xfmer
Anonymous
Unregistered

Not yet, but four days ago Scott wrote: "I'll post some Ballast drawings ASAP...", so stay tuned.
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#127437 - 07/11/01 10:05 PM Re: ballast xfmer
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
habbbby,

Sounds like you are describing a Rapid Start - Hot Cathode Ballast for 2 lamps - typical of F40T12 lamps and HO/VHO lamps of 4' and 8' length.

Unless something changes between tonight and Friday, I will have a whole weekend off!!! Ya, Baby!.

Plan to post a few Audio Xover [passive] schematics, a couple simple motor drawings, and whatever I can draw/convert/post. I'll add a couple Ballast drawings - especially the RS hot Cathode Ballast you are asking about.

Your request is granted

Scott SET
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
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#127438 - 07/12/01 02:45 AM Re: ballast xfmer
sparky Offline
Member
Registered: 10/18/00
Posts: 5545
cool!

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#127439 - 07/12/01 07:26 PM Re: ballast xfmer
habbbby Offline
Member
Registered: 05/27/01
Posts: 17
Loc: Loysvile, PA
yes that is the specific type I was asking about. Thanks, I will be looking for it!
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#127440 - 07/15/01 09:32 PM Re: ballast xfmer
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
Well, the Monkey wrench of time got thrown into the cogs of my "so-called" weekend off

Instead of getting things done like previously planned, only had Sunday off [thankfully ] - which gave me enough time to get 25% [1/4] of things done

Nevertheless, I have posted the Ballast Schematic in the new Technical Reference area, which habbbby was inquiring to.
It's under the subject F40 T12 2 lamp Ballast schematic type 1

I hope it's to your liking!!!

P.S. check out the speaker crossover schematics posted there too..

Scott SET
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
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#127441 - 07/20/01 12:00 AM Re: ballast xfmer
sparky Offline
Member
Registered: 10/18/00
Posts: 5545
can the function of the 'heater' winding be explained?
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#127442 - 07/20/01 01:29 PM Re: ballast xfmer
Anonymous
Unregistered

It is a property of most materials that they will give up electrons much more easily when hot - meaning temperature. This was common nuisance with tube devices that had to be turned on to warm up for several minutes before they would begin working.

Cold cathodes typically employ a much higher discharge voltage so they can emit adequate electrons at typical room temperatures. Alas, this is much less efficient.

Hot cathodes have a heater (basically a little tungsten filament with a special coating) that emits lots of electrons to travel through the gas in the tube and make it glow.

Hot cathodes are quite a bit more efficient. About the only advantage of a cold cathode is the instant start..
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#127443 - 07/21/01 12:04 AM Re: ballast xfmer
sparky Offline
Member
Registered: 10/18/00
Posts: 5545
thanks...
would this explain HO's ?
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#127444 - 08/30/01 07:24 PM Re: ballast xfmer
Anonymous
Unregistered

I just noticed your question. What is it that you wanted explained?
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