| Home | Terms of Use | Site Map | Contact Us |
IndustryCommunity.com > Electrical and Electronic Community > Trading Board A > Message
Main Menu
Find

[ List Subjects ][ Current Board ][ Post Message ]
[ View Followups ][ Post Followup ]

Subject: NEED Print for AT&T Merlin 338A Power Supply

Date: 12/26/00 at 5:13 PM
Posted by: Jeff Wisnia
E-mail: wkrp@tiac.net
Message Posted:

Seeking a schematic with component values for an AT&T Merlin phone (820 Central Unit) system's power supply labeled 338A, circa 1985. Had a ceramic cap connected to one side of the main switcher transistor blow up (first time I've seen a ceramic blow that way, surprised me almost as much as the first time I heard a woman pass gas). The marking got completely blown off, I think the main primary electrolytics discharged right through it.

On a WAG, I replaced it with a .005 uf 1kv ceramic, and amazingly enough the system works again, but I'd like to know the correct value for this cap since I know some switchers are critical of their compensation caps (if in fact that's the function of this cap) and can take off up the j axis under certain load conditions if the compensation is wrong.

Thanks guys, email copies of replies to:

wkrp@tiac.net

appreciated...

Jeff Wisnia W1BSV Brass Rat '57 ee


Follow Ups:


Post a Follow-up:

Name:
E-Mail:
Subject:

Message to Post:

 

1999-2001 Sunlit Technology Co., Ltd. All rights reserved.