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#127435 - 07/11/01 05:21 PM ballast xfmer  
habbbby  Offline
Member
Joined: May 2001
Posts: 17
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 05:37 PM Re: ballast xfmer  
Anonymous
Unregistered

Not yet, but four days ago Scott wrote: "I'll post some Ballast drawings ASAP...", so stay tuned.


#127437 - 07/12/01 01:05 AM Re: ballast xfmer  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
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 [Linked Image]

Scott SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#127438 - 07/12/01 05:45 AM Re: ballast xfmer  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
cool!

[Linked Image]


#127439 - 07/12/01 10:26 PM Re: ballast xfmer  
habbbby  Offline
Member
Joined: May 2001
Posts: 17
Loysvile, PA
yes that is the specific type I was asking about. Thanks, I will be looking for it!


#127440 - 07/16/01 12:32 AM Re: ballast xfmer  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Well, the Monkey wrench of time got thrown into the cogs of my "so-called" weekend off [Linked Image]

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

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!

#127441 - 07/20/01 03:00 AM Re: ballast xfmer  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
can the function of the 'heater' winding be explained?


#127442 - 07/20/01 04:29 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..


#127443 - 07/21/01 03:04 AM Re: ballast xfmer  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
thanks...
would this explain HO's ?


#127444 - 08/30/01 10:24 PM Re: ballast xfmer  
Anonymous
Unregistered

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


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