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Mounting Coupling caps [message #30784] Wed, 02 March 2005 12:25 Go to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
I drilled access holes through the top of the chassis then used RV silicon adhesive to bind them to the metal. But I am not to sure of the integrity of the contact and if it will hold well. Whats a good way to ensure they remain standing upright? I like the way they look sitting behind the 5687 so I would like to keep them there. What do you guys do?

Re: Mounting Coupling caps [message #30787 is a reply to message #30784] Wed, 02 March 2005 15:14 Go to previous messageGo to next message
Thrint is currently offline  Thrint
Messages: 43
Registered: May 2009
Baron
I keep them in the same location and orientation, but glue them to the underside of the chassis with JB Weld. It requires a thicker base x-section...

I suspect that your method would work just fine with JB Quick instead of Silicone. That 2-part is tough stuff. Just clean thoroughly first.
regards,
Douglas

Re: Mounting Coupling caps [message #30788 is a reply to message #30787] Wed, 02 March 2005 16:41 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
Thanks T; So far the silicon is holding cross my fingers. This is a breadboard anyway. I will probably end up re-using them in the custom chassis. While I have you; I sent an e-mail looking for the RS filament schematic. It disapeared off ART and I can't unscramble the one Colin sent. If you get a chance, thanks.

Re: Mounting Coupling caps [message #30789 is a reply to message #30788] Wed, 02 March 2005 17:51 Go to previous messageGo to next message
Thrint is currently offline  Thrint
Messages: 43
Registered: May 2009
Baron
no problem. I'll be home tomorrow to read it. I can't remember my password, else I'd be using my proper name. Glad nobody is bent about it

I'll do a verbal

The 25.2vac/2A RS TX is te one to use. Colin did a two diode, full wave( with the center tap as ground ) to RC-RC with 2R resistors.

http://www.tpub.com/neets/book7/27b.htm

Instead of the resistive laod, we will put in two RC filters.

does this help? or were you planning on using the L-C filter?
regards,
Douglas


Re: Mounting Coupling caps [message #30790 is a reply to message #30789] Wed, 02 March 2005 18:54 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
Yes that helps; I just need a little prodding to wire up the RC filter section. I have the two 47k caps and 4 1ohm cement resistors. The caps are electrolytics so the polarity issue is where I am not certain. I am using the RS 25v fil. trans.


The diodes are the 5408 for now because I had a pair on hand. Question; can we use hexfreds?

I have plenty of room underneath for changes. I am going to take photos of the wire-up for future reference. Or I can post as I go along if anyone's interested.

Cap polarity [message #30791 is a reply to message #30790] Wed, 02 March 2005 19:11 Go to previous messageGo to next message
colinhester is currently offline  colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas
Illuminati (3rd Degree)
For the heater, the negative end of the first cap is attached to the CT adn the second cap's negative is wired directly to the first negative. The resistors are wired in series to the positive side. If you did not catch my earlier post the 5 ohm should be 2 ohn and the 3 ohm should be 2 as well.....Colin

Re: Cap polarity [message #30792 is a reply to message #30791] Wed, 02 March 2005 19:34 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
Thanks C; is that correct; 10000uf caps? Not the 47k's?

Re: Cap polarity [message #30793 is a reply to message #30792] Wed, 02 March 2005 20:06 Go to previous messageGo to next message
Thrint is currently offline  Thrint
Messages: 43
Registered: May 2009
Baron
I think 10k will be OK. I have used 4k7 in the past. 47k is probably best done with 5x 10000 uF. I don't think 47000 uF are going to be small...
regards,
Douglas

Re: Cap polarity [message #30794 is a reply to message #30793] Wed, 02 March 2005 20:12 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
O'kay so 10k is best and 2x1ohm resistors; gotcha, thanks much.

No problem [message #30795 is a reply to message #30794] Thu, 03 March 2005 15:02 Go to previous message
PakProtector is currently offline  PakProtector
Messages: 935
Registered: May 2009
Illuminati (2nd Degree)
See? my moniker still works.

On the cap thing, I assume you remember the lead next to the stripe is negative and will be attached to the common return/filament ground. The voltage will be dealt with on the positive side.
regards,
Douglas

Snake Oil is just that...rendered snake

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