Started by chowder, October 08, 2015, 09:52:23 am
Quote from: zmaster18 on October 08, 2015, 12:10:36 pmThis is it. I use the same schematic but I use a 400ohm instead of 300 and 100ohm instead of 110 because I thought the colors were way off. As for tweaks with jailbars, you can only do so much. Lifting the leg of the PPU and adding some caps here and there only seem to help a little. It's totally optional.
Quote from: Frank_fjs on December 09, 2017, 08:50:41 pmI've attached a picture of the exact AV circuit used in the AV Famicom. The one in the original post is close but is missing the high frequency filtering capacitor and ferrite bead.Regarding jailbars, I use a THS7316 to amplify the composite video signal. The attached pic is from a Famicom console with no pins or traces cut, no copper tape, nothing but pin 21 of the PPU attached to my amp. I hooked all this up with test clips, it looks even better with shorter lengths of shielded wire. Picture is a lot clearer and rock solid with no visible jailbars.Last and final pic is of the AV Famicom video circuit replicated in a PCB I had produced. This is an early prototype version, final version is smaller and includes the ferrite bead.
Quote I assume you still lift Pin 21 from its hole
QuoteAlso, what was the board revision of your Famicom?
QuoteDo you think you can add another cap and points for audio?