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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:



Jeff Wisnia W1BSV Brass Rat '57 ee

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