To: | <tentec@contesting.com> |
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Subject: | [TenTec] Need Century 21 help... |
From: | jdanter@mail.i-america.net (jdanter) |
Date: | Sat Jun 7 19:02:09 2003 |
John, Here are the voltage readings for IC-1, LM3900, the CW filter, on the Audio Preamp board. [Receive, DRIVE fully CCW.] pin- 1- 0.6 [pin left of notch or dimple on chip] 2- 0.6 3- 0.6 4- 5.5 5- 5.5 6- 0.6 7- 0 8- 0 9- 5.3 10-0.1 11-0.6 12-0.5 13-0.6 14-11.5 The LM3900 chip is very inexpensive, approx $1.00. Get a socket too. Future replacement will be easier. 73 NE4TT jamie --- [Pre-scanned for viruses by Internet America.] |
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