Re: Can Someone Please Point Me In The Right Direction. -- New 3C

[ Show ]

Support VoyForums

[ Shrink ]

VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9, [10] ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 20:01:43 12/14/01 Fri
Author: Potter
Subject: Re: Can Someone Please Point Me In The Right Direction.
In reply to: lcs 's message, "Re: Can Someone Please Point Me In The Right Direction." on 20:38:21 12/13/01 Thu

The LM733 is noticably better than a discrete (transistor) input buffer/amplifier (for me at least).
A note about pale & washed out looking picture: I had this problem with all types of amps I tried and it appeared due to the very high input impedance of the unbiassed circuit I was feeding the 3chip's output into. What happens is there is a difference in the average DC level of each channel tuned so the output capacitor (typically 47-470uF) acquires a DC charge which can not dissipate due to the high impedance and really makes a mess of the picture on a channel with a lower average DC level than the last one tuned. The answer was very simple - put a resistor across the output capacitor, ~1K did it and no more problems.

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

Re: Washed out picture. -- Lcs, 20:37:42 12/14/01 Fri
- Re: Washed out picture. -- Jain, 13:31:12 12/16/01 Sun
  - Re: Bad picture in Canton 4.2 -- lcs, 19:20:58 12/17/01 Mon
    - Re: Bad picture in Canton 4.2 -- Potter, 06:20:45 12/18/01 Tue
      - Re: Bad picture in Canton 4.2 -- lcs, 19:50:54 12/18/01 Tue
        Re: Bad picture in Canton 4.2 -- Potter, 05:14:58 12/19/01 Wed
        Re: Bad picture in Canton 4.2 -- lcs, 21:16:28 12/19/01 Wed
  - Re: About the schematic -- lcs, 19:59:28 12/17/01 Mon
    - Re: About the schematic -- Jain, 08:23:14 12/18/01 Tue

[ Contact Forum Admin ]

Forum timezone: GMT-8
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums^(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.