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Re: [TenTec] Herc II idling collector current adjustment

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Herc II idling collector current adjustment
From: Ken Brown <ken.d.brown@verizon.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 21 Feb 2005 12:59:44 -1000
List-post: <mailto:tentec@contesting.com>
I only see a U1, U2 and U3, all LM358N. There is a non-zero DC input on the + input of U3, with the amp on and not keyed. So I think that the DC offset may be coming from U1 or U2. I would replace them all if I had them handy.

Hey, check out R22 a 100 ohm resitor to ground on one ouput of U1! None of the other outputs have one. Shouldn't it be connected to the opposite end of R35? to make the load on all of the opamps and zero ohm resistors the same?

While you've got it opened, though, you might consider
changing out U5 on the distrib board.



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