AcornElectronMainboard

video.sch

18:f1d60a768fbd
2022-07-05 Paul Boddie Added decoupling capacitors for RAM chips and tidied the layout somewhat.
     1 EESchema Schematic File Version 4     2 LIBS:AcornElectronMainboard-cache     3 EELAYER 26 0     4 EELAYER END     5 $Descr A4 11693 8268     6 encoding utf-8     7 Sheet 8 9     8 Title ""     9 Date ""    10 Rev ""    11 Comp ""    12 Comment1 ""    13 Comment2 ""    14 Comment3 ""    15 Comment4 ""    16 $EndDescr    17 $Comp    18 L Device:R R31    19 U 1 1 61DEE018    20 P 4250 2600    21 F 0 "R31" V 4150 2600 50  0000 C CNN    22 F 1 "3900R" V 4350 2600 50  0000 C CNN    23 F 2 "" V 4180 2600 50  0001 C CNN    24 F 3 "~" H 4250 2600 50  0001 C CNN    25 	1    4250 2600    26 	0    1    1    0       27 $EndComp    28 $Comp    29 L Device:R R32    30 U 1 1 61DEE01F    31 P 4550 2800    32 F 0 "R32" V 4450 2800 50  0000 C CNN    33 F 1 "1000R" V 4650 2800 50  0000 C CNN    34 F 2 "" V 4480 2800 50  0001 C CNN    35 F 3 "~" H 4550 2800 50  0001 C CNN    36 	1    4550 2800    37 	0    1    1    0       38 $EndComp    39 $Comp    40 L Device:R R33    41 U 1 1 61DEE026    42 P 4250 3000    43 F 0 "R33" V 4150 3000 50  0000 C CNN    44 F 1 "2200R" V 4350 3000 50  0000 C CNN    45 F 2 "" V 4180 3000 50  0001 C CNN    46 F 3 "~" H 4250 3000 50  0001 C CNN    47 	1    4250 3000    48 	0    1    1    0       49 $EndComp    50 $Comp    51 L Device:R R45    52 U 1 1 61DEE04E    53 P 4350 1500    54 F 0 "R45" V 4250 1500 50  0000 C CNN    55 F 1 "68R" V 4450 1500 50  0000 C CNN    56 F 2 "" V 4280 1500 50  0001 C CNN    57 F 3 "~" H 4350 1500 50  0001 C CNN    58 	1    4350 1500    59 	0    1    1    0       60 $EndComp    61 $Comp    62 L Device:R R46    63 U 1 1 61DEE055    64 P 4650 1700    65 F 0 "R46" V 4550 1700 50  0000 C CNN    66 F 1 "68R" V 4750 1700 50  0000 C CNN    67 F 2 "" V 4580 1700 50  0001 C CNN    68 F 3 "~" H 4650 1700 50  0001 C CNN    69 	1    4650 1700    70 	0    1    1    0       71 $EndComp    72 $Comp    73 L Device:R R47    74 U 1 1 61DEE05C    75 P 4350 1900    76 F 0 "R47" V 4250 1900 50  0000 C CNN    77 F 1 "68R" V 4450 1900 50  0000 C CNN    78 F 2 "" V 4280 1900 50  0001 C CNN    79 F 3 "~" H 4350 1900 50  0001 C CNN    80 	1    4350 1900    81 	0    1    1    0       82 $EndComp    83 Wire Wire Line    84 	4200 1500 4000 1500    85 Connection ~ 4000 1500    86 Wire Wire Line    87 	3900 1700 4500 1700    88 Wire Wire Line    89 	4200 1900 3800 1900    90 Connection ~ 3800 1900    91 Wire Wire Line    92 	3800 1900 3800 3000    93 $Comp    94 L Connector:DIN-6 SK2    95 U 1 1 61DEE06D    96 P 6300 1800    97 F 0 "SK2" H 6500 1600 50  0000 C CNN    98 F 1 "RGB" H 6500 1500 50  0000 C CNN    99 F 2 "" H 6300 1800 50  0001 C CNN   100 F 3 "http://www.mouser.com/ds/2/18/40_c091_abd_e-75918.pdf" H 6300 1800 50  0001 C CNN   101 	1    6300 1800   102 	1    0    0    -1     103 $EndComp   104 Wire Wire Line   105 	4800 1700 6000 1700   106 Wire Wire Line   107 	4500 1500 6300 1500   108 Text GLabel 6700 1900 2    50   Input ~ 0   109 0V   110 Text GLabel 6300 2200 3    50   Input ~ 0   111 5V   112 Wire Wire Line   113 	6300 2200 6300 2100   114 Wire Wire Line   115 	1000 1300 3700 1300   116 Wire Wire Line   117 	3700 1300 6600 1300   118 Wire Wire Line   119 	6600 1300 6600 1700   120 Connection ~ 3700 1300   121 $Comp   122 L Connector:Conn_Coaxial SK3   123 U 1 1 61DEE0F7   124 P 6300 2600   125 F 0 "SK3" H 6399 2576 50  0000 L CNN   126 F 1 "VIDEO" H 6399 2485 50  0000 L CNN   127 F 2 "" H 6300 2600 50  0001 C CNN   128 F 3 " ~" H 6300 2600 50  0001 C CNN   129 	1    6300 2600   130 	1    0    0    -1     131 $EndComp   132 Wire Wire Line   133 	3900 2800 4400 2800   134 Connection ~ 3900 1700   135 Wire Wire Line   136 	3800 3000 4100 3000   137 Wire Wire Line   138 	4000 2600 4100 2600   139 Text GLabel 6300 2900 3    50   Input ~ 0   140 0V   141 Wire Wire Line   142 	6300 2900 6300 2800   143 $Comp   144 L Device:R R39   145 U 1 1 61DEE107   146 P 4900 2350   147 F 0 "R39" H 4970 2396 50  0000 L CNN   148 F 1 "1000R" H 4970 2305 50  0000 L CNN   149 F 2 "" V 4830 2350 50  0001 C CNN   150 F 3 "~" H 4900 2350 50  0001 C CNN   151 	1    4900 2350   152 	1    0    0    -1     153 $EndComp   154 Wire Wire Line   155 	6700 1900 6600 1900   156 Wire Wire Line   157 	4500 1900 6000 1900   158 Text GLabel 4900 2100 1    50   Input ~ 0   159 5V   160 Wire Wire Line   161 	4900 2100 4900 2200   162 $Comp   163 L Device:R R48   164 U 1 1 61DEE112   165 P 5500 2350   166 F 0 "R48" H 5570 2396 50  0000 L CNN   167 F 1 "68R" H 5570 2305 50  0000 L CNN   168 F 2 "" V 5430 2350 50  0001 C CNN   169 F 3 "~" H 5500 2350 50  0001 C CNN   170 	1    5500 2350   171 	1    0    0    -1     172 $EndComp   173 Text GLabel 5500 2100 1    50   Input ~ 0   174 5V   175 Wire Wire Line   176 	5500 2200 5500 2100   177 $Comp   178 L Device:R R49   179 U 1 1 61DEE11B   180 P 5850 2600   181 F 0 "R49" V 5750 2600 50  0000 C CNN   182 F 1 "68R" V 5950 2600 50  0000 C CNN   183 F 2 "" V 5780 2600 50  0001 C CNN   184 F 3 "~" H 5850 2600 50  0001 C CNN   185 	1    5850 2600   186 	0    1    1    0      187 $EndComp   188 $Comp   189 L Device:R R40   190 U 1 1 61DEE122   191 P 5000 3050   192 F 0 "R40" H 5070 3096 50  0000 L CNN   193 F 1 "470R" H 5070 3005 50  0000 L CNN   194 F 2 "" V 4930 3050 50  0001 C CNN   195 F 3 "~" H 5000 3050 50  0001 C CNN   196 	1    5000 3050   197 	1    0    0    -1     198 $EndComp   199 $Comp   200 L bc309:BC309 Q8   201 U 1 1 61DEE129   202 P 5300 2800   203 F 0 "Q8" H 5491 2754 50  0000 L CNN   204 F 1 "BC309" H 5491 2845 50  0000 L CNN   205 F 2 "Package_TO_SOT_THT:TO-92_Inline" H 5500 2725 50  0001 L CIN   206 F 3 "https://www.futurlec.com/Transistors/BC309.shtml" H 5300 2800 50  0001 L CNN   207 	1    5300 2800   208 	1    0    0    1      209 $EndComp   210 Wire Wire Line   211 	6100 2600 6000 2600   212 Wire Wire Line   213 	5400 2600 5500 2600   214 Wire Wire Line   215 	5500 2600 5500 2500   216 Connection ~ 5500 2600   217 Wire Wire Line   218 	5500 2600 5700 2600   219 Wire Wire Line   220 	4400 2600 4800 2600   221 Wire Wire Line   222 	5100 2600 5100 2800   223 Wire Wire Line   224 	4900 2600 4900 2500   225 Connection ~ 4900 2600   226 Wire Wire Line   227 	4900 2600 5000 2600   228 Wire Wire Line   229 	5000 2900 5000 2600   230 Connection ~ 5000 2600   231 Wire Wire Line   232 	5000 2600 5100 2600   233 $Comp   234 L Device:R R34   235 U 1 1 61DEE13D   236 P 4550 3200   237 F 0 "R34" V 4450 3200 50  0000 C CNN   238 F 1 "1000R" V 4650 3200 50  0000 C CNN   239 F 2 "" V 4480 3200 50  0001 C CNN   240 F 3 "~" H 4550 3200 50  0001 C CNN   241 	1    4550 3200   242 	0    1    1    0      243 $EndComp   244 Wire Wire Line   245 	3700 3200 4400 3200   246 Wire Wire Line   247 	4800 2600 4800 2800   248 Wire Wire Line   249 	4800 3200 4700 3200   250 Connection ~ 4800 2600   251 Wire Wire Line   252 	4800 2600 4900 2600   253 Wire Wire Line   254 	4400 3000 4800 3000   255 Connection ~ 4800 3000   256 Wire Wire Line   257 	4800 3000 4800 3200   258 Wire Wire Line   259 	4700 2800 4800 2800   260 Connection ~ 4800 2800   261 Wire Wire Line   262 	4800 2800 4800 3000   263 Text GLabel 5000 3300 3    50   Input ~ 0   264 0V   265 Wire Wire Line   266 	5000 3300 5000 3200   267 Text GLabel 5400 3300 3    50   Input ~ 0   268 0V   269 Wire Wire Line   270 	5400 3300 5400 3000   271 Text GLabel 1000 1300 0    50   Input ~ 0   272 ~CSYNC   273 Text GLabel 1000 1500 0    50   Input ~ 0   274 BLUE   275 Text GLabel 1000 1700 0    50   Input ~ 0   276 GREEN   277 Text GLabel 1000 1900 0    50   Input ~ 0   278 RED   279 Wire Wire Line   280 	4000 1500 4000 2600   281 Wire Wire Line   282 	3900 1700 3900 2800   283 Wire Wire Line   284 	1000 1500 4000 1500   285 Wire Wire Line   286 	1000 1700 3900 1700   287 Wire Wire Line   288 	1000 1900 3800 1900   289 Wire Wire Line   290 	3700 1300 3700 3200   291 $Comp   292 L Jumper:Jumper_2_Open LK4   293 U 1 1 62416A28   294 P 4500 4000   295 F 0 "LK4" H 4500 4235 50  0000 C CNN   296 F 1 "NF" H 4500 4144 50  0000 C CNN   297 F 2 "" H 4500 4000 50  0001 C CNN   298 F 3 "~" H 4500 4000 50  0001 C CNN   299 	1    4500 4000   300 	1    0    0    -1     301 $EndComp   302 Wire Wire Line   303 	4700 4000 4800 4000   304 Wire Wire Line   305 	4800 4000 4800 3200   306 Connection ~ 4800 3200   307 Text GLabel 4200 4000 0    50   Input ~ 0   308 UHF_IN   309 Wire Wire Line   310 	4200 4000 4300 4000   311 Text Notes 3900 4200 0    50   ~ 0   312 For optional link from UHF circuit.   313 $EndSCHEMATC