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Date Posted: 14:21:59 09/19/03 Fri
Author: Boubou
Subject: LA7578 IF Chip pin 17 or 21?

Could anyone tell me on which pin do I have to take my video output on the LA7578N IF Chip?
If I look at the datasheet, I have the choice between the pin 21 and the pin 17. The last one is told to have a 4,5 Mhz component. And I'm not sure if I should cut the circuit right after the chip and if I have to put a cap.

Concerning the AGC mods, I understand that I have to put a RC circuit between pin 13 and the ground (850k and 22 or 47uf). Is that right? If it is, I suppose I put it directly on the chip by cuting the pin and bypassing the rest of the VCR demodulator board.

I've already seen info on the forum for this chip, but it was talking about the AGC mod not the video output...

I live in Hull-Gatineau (Quebec, Canada) and I built Canton 4.2 and Piu. I tested both REV7t1d2 and Giln18a code but can't get a lock or even edge detection on scrambled channels, probably because of bluescreen.

Hope somebody will help me! You can reply in French, English or even Spanish! I'll do the necessary to understand!

Thanks to all

Steeve

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