# HG changeset patch # User Paul Boddie # Date 1675776517 -3600 # Node ID 08b8473ab24475733566fce8771925d8ab0a3c10 # Parent 3e67d2b14e1b31a15a1616077c115ce7e3180cd8 Introduced missing LK3 and IC14 unit supplying the RGB sync pin, together with the apparent connection between the UHF and video circuits via R26. diff -r 3e67d2b14e1b -r 08b8473ab244 AcornElectronMainboard.pro --- a/AcornElectronMainboard.pro Tue Feb 07 14:24:41 2023 +0100 +++ b/AcornElectronMainboard.pro Tue Feb 07 14:28:37 2023 +0100 @@ -1,4 +1,4 @@ -update=Tue 24 Jan 2023 21:57:29 CET +update=Wed 01 Feb 2023 12:59:48 CET version=1 last_client=kicad [general] diff -r 3e67d2b14e1b -r 08b8473ab244 UHF.sch --- a/UHF.sch Tue Feb 07 14:24:41 2023 +0100 +++ b/UHF.sch Tue Feb 07 14:28:37 2023 +0100 @@ -1432,4 +1432,9 @@ Connection ~ 3850 5550 Wire Wire Line 3850 5550 3850 5850 +Text GLabel 7900 800 2 50 UnSpc ~ 0 +~CSYNC_COMMON +Wire Wire Line + 7700 800 7900 800 +Connection ~ 7700 800 $EndSCHEMATC diff -r 3e67d2b14e1b -r 08b8473ab244 video.sch --- a/video.sch Tue Feb 07 14:24:41 2023 +0100 +++ b/video.sch Tue Feb 07 14:28:37 2023 +0100 @@ -114,10 +114,7 @@ Wire Wire Line 1000 1300 3700 1300 Wire Wire Line - 3700 1300 6600 1300 -Wire Wire Line - 6600 1300 6600 1700 -Connection ~ 3700 1300 + 6600 1200 6600 1700 $Comp L Connector:Conn_Coaxial SK3 U 1 1 61DEE0F7 @@ -310,4 +307,60 @@ 4200 4000 4300 4000 Text Notes 3900 4200 0 50 ~ 0 For optional link from UHF circuit. +Text GLabel 3500 3200 0 50 UnSpc ~ 0 +~CSYNC_COMMON +Wire Wire Line + 3500 3200 3700 3200 +Connection ~ 3700 3200 +$Comp +L 74xx:74LS86 IC14 +U 4 1 63EE1FF3 +P 6000 1200 +F 0 "IC14" H 6000 1525 50 0000 C CNN +F 1 "74LS86" H 6000 1434 50 0000 C CNN +F 2 "" H 6000 1200 50 0001 C CNN +F 3 "74xx/74ls86.pdf" H 6000 1200 50 0001 C CNN + 4 6000 1200 + 1 0 0 -1 +$EndComp +Wire Wire Line + 6300 1200 6600 1200 +Wire Wire Line + 3700 1300 5700 1300 +Connection ~ 3700 1300 +Wire Wire Line + 5100 950 5100 1100 +Wire Wire Line + 5100 1100 5700 1100 +Text GLabel 4700 800 0 50 Input ~ 0 +0V +Text GLabel 5500 800 2 50 Input ~ 0 +5V +Wire Wire Line + 5350 800 5500 800 +Wire Wire Line + 4700 800 4850 800 +$Comp +L Jumper:Jumper_3_Bridged12 LK3 +U 1 1 63EF18F0 +P 5100 800 +F 0 "LK3" H 5100 1004 50 0000 C CNN +F 1 "Jumper_3_Bridged12" H 5100 913 50 0000 C CNN +F 2 "" H 5100 800 50 0001 C CNN +F 3 "~" H 5100 800 50 0001 C CNN + 1 5100 800 + 1 0 0 -1 +$EndComp +$Comp +L power:PWR_FLAG #FLG0101 +U 1 1 63EF2C91 +P 5100 1100 +F 0 "#FLG0101" H 5100 1175 50 0001 C CNN +F 1 "PWR_FLAG" V 5100 1228 50 0000 L CNN +F 2 "" H 5100 1100 50 0001 C CNN +F 3 "~" H 5100 1100 50 0001 C CNN + 1 5100 1100 + 0 -1 -1 0 +$EndComp +Connection ~ 5100 1100 $EndSCHEMATC