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 4 9 8 Title "" 9 Date "" 10 Rev "" 11 Comp "" 12 Comment1 "" 13 Comment2 "" 14 Comment3 "" 15 Comment4 "" 16 $EndDescr 17 $Comp 18 L bc239:BC239 Q? 19 U 1 1 624E7EDE 20 P 3200 5100 21 AR Path="/624E7EDE" Ref="Q?" Part="1" 22 AR Path="/624B50A6/624E7EDE" Ref="Q2" Part="1" 23 F 0 "Q2" V 3528 5100 50 0000 C CNN 24 F 1 "BC239" V 3437 5100 50 0000 C CNN 25 F 2 "Package_TO_SOT_THT:TO-92_Inline" H 3400 5025 50 0001 L CIN 26 F 3 "https://www.futurlec.com/Transistors/BC239.shtml" H 3200 5100 50 0001 L CNN 27 1 3200 5100 28 0 -1 -1 0 29 $EndComp 30 $Comp 31 L bc239:BC239 Q? 32 U 1 1 624E7EE5 33 P 3600 4700 34 AR Path="/624E7EE5" Ref="Q?" Part="1" 35 AR Path="/624B50A6/624E7EE5" Ref="Q1" Part="1" 36 F 0 "Q1" V 3928 4700 50 0000 C CNN 37 F 1 "BC239" V 3837 4700 50 0000 C CNN 38 F 2 "Package_TO_SOT_THT:TO-92_Inline" H 3800 4625 50 0001 L CIN 39 F 3 "https://www.futurlec.com/Transistors/BC239.shtml" H 3600 4700 50 0001 L CNN 40 1 3600 4700 41 0 1 -1 0 42 $EndComp 43 $Comp 44 L Device:D D? 45 U 1 1 624E7EEC 46 P 2400 5750 47 AR Path="/624E7EEC" Ref="D?" Part="1" 48 AR Path="/624B50A6/624E7EEC" Ref="D8" Part="1" 49 F 0 "D8" V 2354 5829 50 0000 L CNN 50 F 1 "D" V 2445 5829 50 0000 L CNN 51 F 2 "" H 2400 5750 50 0001 C CNN 52 F 3 "~" H 2400 5750 50 0001 C CNN 53 1 2400 5750 54 0 1 1 0 55 $EndComp 56 $Comp 57 L Device:R R? 58 U 1 1 624E7EF3 59 P 3000 5750 60 AR Path="/624E7EF3" Ref="R?" Part="1" 61 AR Path="/624B50A6/624E7EF3" Ref="R8" Part="1" 62 F 0 "R8" H 3070 5796 50 0000 L CNN 63 F 1 "3300R" H 3070 5705 50 0000 L CNN 64 F 2 "" V 2930 5750 50 0001 C CNN 65 F 3 "~" H 3000 5750 50 0001 C CNN 66 1 3000 5750 67 1 0 0 -1 68 $EndComp 69 $Comp 70 L Device:CP C? 71 U 1 1 624E7EFA 72 P 2650 5500 73 AR Path="/624E7EFA" Ref="C?" Part="1" 74 AR Path="/624B50A6/624E7EFA" Ref="C7" Part="1" 75 F 0 "C7" V 2900 5500 50 0000 C CNN 76 F 1 "10??F" V 2800 5500 50 0000 C CNN 77 F 2 "" H 2688 5350 50 0001 C CNN 78 F 3 "~" H 2650 5500 50 0001 C CNN 79 1 2650 5500 80 0 -1 -1 0 81 $EndComp 82 Text GLabel 2400 6000 3 50 Input ~ 0 83 0V 84 Text GLabel 3000 6000 3 50 Input ~ 0 85 -5V 86 Wire Wire Line 87 2400 5500 2400 5600 88 Connection ~ 2400 5500 89 Wire Wire Line 90 2400 5500 2500 5500 91 Wire Wire Line 92 2400 5900 2400 6000 93 Wire Wire Line 94 3000 6000 3000 5900 95 Wire Wire Line 96 3000 5600 3000 5500 97 Wire Wire Line 98 3000 5500 2900 5500 99 Wire Wire Line 100 2900 5500 2900 5300 101 Wire Wire Line 102 2900 5300 3200 5300 103 Connection ~ 2900 5500 104 Wire Wire Line 105 2900 5500 2800 5500 106 Wire Wire Line 107 2900 5300 2900 5000 108 Wire Wire Line 109 2900 5000 3000 5000 110 Connection ~ 2900 5300 111 Wire Wire Line 112 3400 4600 2900 4600 113 Wire Wire Line 114 2900 4600 2900 5000 115 Connection ~ 2900 5000 116 $Comp 117 L Amplifier_Operational:LM324 IC? 118 U 4 1 624E7F15 119 P 3400 5500 120 AR Path="/624E7F15" Ref="IC?" Part="4" 121 AR Path="/624B50A6/624E7F15" Ref="IC13" Part="4" 122 F 0 "IC13" H 3300 5800 50 0000 C CNN 123 F 1 "LM324" H 3300 5900 50 0000 C CNN 124 F 2 "" H 3350 5600 50 0001 C CNN 125 F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 3450 5700 50 0001 C CNN 126 4 3400 5500 127 -1 0 0 1 128 $EndComp 129 Wire Wire Line 130 3000 5500 3100 5500 131 Connection ~ 3000 5500 132 $Comp 133 L Device:R R? 134 U 1 1 624E7F1E 135 P 3250 4300 136 AR Path="/624E7F1E" Ref="R?" Part="1" 137 AR Path="/624B50A6/624E7F1E" Ref="R9" Part="1" 138 F 0 "R9" V 3043 4300 50 0000 C CNN 139 F 1 "270000R" V 3134 4300 50 0000 C CNN 140 F 2 "" V 3180 4300 50 0001 C CNN 141 F 3 "~" H 3250 4300 50 0001 C CNN 142 1 3250 4300 143 0 1 1 0 144 $EndComp 145 Wire Wire Line 146 2900 4600 2900 4300 147 Wire Wire Line 148 2900 4300 3100 4300 149 Connection ~ 2900 4600 150 $Comp 151 L Device:R R? 152 U 1 1 624E7F28 153 P 4150 5400 154 AR Path="/624E7F28" Ref="R?" Part="1" 155 AR Path="/624B50A6/624E7F28" Ref="R11" Part="1" 156 F 0 "R11" V 3943 5400 50 0000 C CNN 157 F 1 "4700R" V 4034 5400 50 0000 C CNN 158 F 2 "" V 4080 5400 50 0001 C CNN 159 F 3 "~" H 4150 5400 50 0001 C CNN 160 1 4150 5400 161 0 1 1 0 162 $EndComp 163 Wire Wire Line 164 3700 5400 3900 5400 165 Wire Wire Line 166 3400 5000 3900 5000 167 Wire Wire Line 168 3900 5000 3900 5400 169 Connection ~ 3900 5400 170 Wire Wire Line 171 3900 5400 4000 5400 172 Wire Wire Line 173 3600 4900 3900 4900 174 Wire Wire Line 175 3900 4900 3900 5000 176 Connection ~ 3900 5000 177 Wire Wire Line 178 3800 4600 3900 4600 179 Wire Wire Line 180 3900 4600 3900 4900 181 Connection ~ 3900 4900 182 Wire Wire Line 183 3900 4600 3900 4300 184 Wire Wire Line 185 3900 4300 3400 4300 186 Connection ~ 3900 4600 187 $Comp 188 L Device:R R? 189 U 1 1 624E7F3E 190 P 3950 5600 191 AR Path="/624E7F3E" Ref="R?" Part="1" 192 AR Path="/624B50A6/624E7F3E" Ref="R10" Part="1" 193 F 0 "R10" V 4050 5600 50 0000 C CNN 194 F 1 "4700R" V 4150 5600 50 0000 C CNN 195 F 2 "" V 3880 5600 50 0001 C CNN 196 F 3 "~" H 3950 5600 50 0001 C CNN 197 1 3950 5600 198 0 1 1 0 199 $EndComp 200 Text GLabel 4200 5600 2 50 Input ~ 0 201 0V 202 Wire Wire Line 203 4200 5600 4100 5600 204 Wire Wire Line 205 3800 5600 3700 5600 206 Text GLabel 2200 5500 0 50 Output ~ 0 207 CASSETTE_INPUT 208 Wire Wire Line 209 2200 5500 2400 5500 210 $Comp 211 L Device:R R? 212 U 1 1 625E9E43 213 P 4900 5650 214 AR Path="/625E9E43" Ref="R?" Part="1" 215 AR Path="/624B50A6/625E9E43" Ref="R15" Part="1" 216 F 0 "R15" H 4970 5696 50 0000 L CNN 217 F 1 "5600R" H 4970 5605 50 0000 L CNN 218 F 2 "" V 4830 5650 50 0001 C CNN 219 F 3 "~" H 4900 5650 50 0001 C CNN 220 1 4900 5650 221 1 0 0 -1 222 $EndComp 223 Text GLabel 4900 5900 3 50 Input ~ 0 224 -5V 225 Wire Wire Line 226 4900 5900 4900 5800 227 $Comp 228 L Device:C C10 229 U 1 1 625EA2FB 230 P 4550 5400 231 F 0 "C10" V 4298 5400 50 0000 C CNN 232 F 1 "220nF" V 4389 5400 50 0000 C CNN 233 F 2 "" H 4588 5250 50 0001 C CNN 234 F 3 "~" H 4550 5400 50 0001 C CNN 235 1 4550 5400 236 0 1 1 0 237 $EndComp 238 Wire Wire Line 239 4300 5400 4400 5400 240 Wire Wire Line 241 4700 5400 4800 5400 242 Wire Wire Line 243 4900 5400 4900 5500 244 $Comp 245 L Device:R R? 246 U 1 1 625EAE43 247 P 5250 4900 248 AR Path="/625EAE43" Ref="R?" Part="1" 249 AR Path="/624B50A6/625EAE43" Ref="R18" Part="1" 250 F 0 "R18" V 5043 4900 50 0000 C CNN 251 F 1 "10000R" V 5134 4900 50 0000 C CNN 252 F 2 "" V 5180 4900 50 0001 C CNN 253 F 3 "~" H 5250 4900 50 0001 C CNN 254 1 5250 4900 255 0 1 1 0 256 $EndComp 257 $Comp 258 L Amplifier_Operational:LM324 IC13 259 U 3 1 625EAF69 260 P 5300 5400 261 F 0 "IC13" H 5200 5700 50 0000 C CNN 262 F 1 "LM324" H 5200 5800 50 0000 C CNN 263 F 2 "" H 5250 5500 50 0001 C CNN 264 F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 5350 5600 50 0001 C CNN 265 3 5300 5400 266 -1 0 0 1 267 $EndComp 268 Wire Wire Line 269 5000 5400 4900 5400 270 Connection ~ 4900 5400 271 Wire Wire Line 272 4800 5400 4800 4900 273 Wire Wire Line 274 4800 4900 5100 4900 275 Connection ~ 4800 5400 276 Wire Wire Line 277 4800 5400 4900 5400 278 $Comp 279 L Device:R R? 280 U 1 1 625EC575 281 P 5950 5300 282 AR Path="/625EC575" Ref="R?" Part="1" 283 AR Path="/624B50A6/625EC575" Ref="R20" Part="1" 284 F 0 "R20" V 5743 5300 50 0000 C CNN 285 F 1 "39000R" V 5834 5300 50 0000 C CNN 286 F 2 "" V 5880 5300 50 0001 C CNN 287 F 3 "~" H 5950 5300 50 0001 C CNN 288 1 5950 5300 289 0 1 1 0 290 $EndComp 291 Wire Wire Line 292 5600 5300 5700 5300 293 Wire Wire Line 294 5700 5300 5700 4900 295 Wire Wire Line 296 5700 4900 5400 4900 297 Connection ~ 5700 5300 298 Wire Wire Line 299 5700 5300 5800 5300 300 Text GLabel 6200 5300 2 50 Input ~ 0 301 0V 302 Wire Wire Line 303 6200 5300 6100 5300 304 $Comp 305 L Device:R R? 306 U 1 1 625ED659 307 P 6550 5500 308 AR Path="/625ED659" Ref="R?" Part="1" 309 AR Path="/624B50A6/625ED659" Ref="R25" Part="1" 310 F 0 "R25" V 6343 5500 50 0000 C CNN 311 F 1 "8200R" V 6434 5500 50 0000 C CNN 312 F 2 "" V 6480 5500 50 0001 C CNN 313 F 3 "~" H 6550 5500 50 0001 C CNN 314 1 6550 5500 315 0 1 1 0 316 $EndComp 317 $Comp 318 L Device:R R? 319 U 1 1 625ED707 320 P 7050 5500 321 AR Path="/625ED707" Ref="R?" Part="1" 322 AR Path="/624B50A6/625ED707" Ref="R26" Part="1" 323 F 0 "R26" V 6843 5500 50 0000 C CNN 324 F 1 "8200R" V 6934 5500 50 0000 C CNN 325 F 2 "" V 6980 5500 50 0001 C CNN 326 F 3 "~" H 7050 5500 50 0001 C CNN 327 1 7050 5500 328 0 1 1 0 329 $EndComp 330 Wire Wire Line 331 6700 5500 6800 5500 332 Wire Wire Line 333 5600 5500 6000 5500 334 $Comp 335 L Device:C C14 336 U 1 1 625EE44B 337 P 6000 5750 338 F 0 "C14" H 5885 5704 50 0000 R CNN 339 F 1 "4.7nF" H 5885 5795 50 0000 R CNN 340 F 2 "" H 6038 5600 50 0001 C CNN 341 F 3 "~" H 6000 5750 50 0001 C CNN 342 1 6000 5750 343 -1 0 0 1 344 $EndComp 345 Text GLabel 6000 6000 3 50 Input ~ 0 346 0V 347 Wire Wire Line 348 6000 6000 6000 5900 349 Wire Wire Line 350 6000 5600 6000 5500 351 Connection ~ 6000 5500 352 Wire Wire Line 353 6000 5500 6400 5500 354 $Comp 355 L Device:C C16 356 U 1 1 625EF33A 357 P 6800 5050 358 F 0 "C16" H 6685 5004 50 0000 R CNN 359 F 1 "4.7nF" H 6685 5095 50 0000 R CNN 360 F 2 "" H 6838 4900 50 0001 C CNN 361 F 3 "~" H 6800 5050 50 0001 C CNN 362 1 6800 5050 363 -1 0 0 1 364 $EndComp 365 Wire Wire Line 366 4800 4900 4800 4500 367 Wire Wire Line 368 4800 4500 6800 4500 369 Wire Wire Line 370 6800 4500 6800 4900 371 Connection ~ 4800 4900 372 Wire Wire Line 373 6800 5200 6800 5500 374 Connection ~ 6800 5500 375 Wire Wire Line 376 6800 5500 6900 5500 377 $Comp 378 L Amplifier_Operational:LM324 U? 379 U 2 1 625F1129 380 P 7700 5500 381 F 0 "U?" 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Part="1" 408 AR Path="/624B50A6/625F1B53" Ref="R35" Part="1" 409 F 0 "R35" V 7443 4500 50 0000 C CNN 410 F 1 "150000R" V 7534 4500 50 0000 C CNN 411 F 2 "" V 7580 4500 50 0001 C CNN 412 F 3 "~" H 7650 4500 50 0001 C CNN 413 1 7650 4500 414 0 1 1 0 415 $EndComp 416 $Comp 417 L Device:R R? 418 U 1 1 625F1CAD 419 P 8350 5400 420 AR Path="/625F1CAD" Ref="R?" Part="1" 421 AR Path="/624B50A6/625F1CAD" Ref="R43" Part="1" 422 F 0 "R43" V 8143 5400 50 0000 C CNN 423 F 1 "820000R" V 8234 5400 50 0000 C CNN 424 F 2 "" V 8280 5400 50 0001 C CNN 425 F 3 "~" H 8350 5400 50 0001 C CNN 426 1 8350 5400 427 0 1 1 0 428 $EndComp 429 $Comp 430 L Device:R R? 431 U 1 1 625F1DF1 432 P 8900 5850 433 AR Path="/625F1DF1" Ref="R?" 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Part="1" 553 AR Path="/624B50A6/62602878" Ref="D6" Part="1" 554 F 0 "D6" V 10154 4829 50 0000 L CNN 555 F 1 "D" V 10245 4829 50 0000 L CNN 556 F 2 "" H 10200 4750 50 0001 C CNN 557 F 3 "~" H 10200 4750 50 0001 C CNN 558 1 10200 4750 559 0 1 1 0 560 $EndComp 561 Text GLabel 10200 5000 3 50 Input ~ 0 562 -5V 563 Wire Wire Line 564 10200 5000 10200 4900 565 Wire Wire Line 566 10200 4600 10200 4500 567 Wire Wire Line 568 10200 4500 9900 4500 569 Connection ~ 9900 4500 570 $Comp 571 L Connector:DIN-7 J? 572 U 1 1 626325EF 573 P 9700 1900 574 AR Path="/626325EF" Ref="J?" Part="1" 575 AR Path="/624B50A6/626325EF" Ref="SK1" Part="1" 576 F 0 "SK1" H 9700 1626 50 0000 C CNN 577 F 1 "CASSETTE" H 9700 1535 50 0000 C CNN 578 F 2 "" H 9700 1900 50 0001 C CNN 579 F 3 "http://www.mouser.com/ds/2/18/40_c091_abd_e-75918.pdf" H 9700 1900 50 0001 C CNN 580 1 9700 1900 581 1 0 0 -1 582 $EndComp 583 $Comp 584 L Device:R R? 585 U 1 1 6263555D 586 P 10200 3550 587 AR Path="/6263555D" Ref="R?" 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Part="1" 793 AR Path="/624B50A6/61DC7286" Ref="R56" Part="1" 794 F 0 "R56" H 2750 2500 50 0000 R CNN 795 F 1 "56000R" H 2750 2600 50 0000 R CNN 796 F 2 "" V 2730 2550 50 0001 C CNN 797 F 3 "~" H 2800 2550 50 0001 C CNN 798 1 2800 2550 799 -1 0 0 1 800 $EndComp 801 Text GLabel 2800 2300 1 50 Input ~ 0 802 5V 803 $Comp 804 L Device:C C8 805 U 1 1 61DC7D6C 806 P 2800 3050 807 F 0 "C8" H 2685 3004 50 0000 R CNN 808 F 1 "1??F" H 2685 3095 50 0000 R CNN 809 F 2 "" H 2838 2900 50 0001 C CNN 810 F 3 "~" H 2800 3050 50 0001 C CNN 811 1 2800 3050 812 -1 0 0 1 813 $EndComp 814 $Comp 815 L Device:D D? 816 U 1 1 61DC7F00 817 P 2500 3350 818 AR Path="/61DC7F00" Ref="D?" Part="1" 819 AR Path="/624B50A6/61DC7F00" Ref="D5" Part="1" 820 F 0 "D5" V 2550 3450 50 0000 L CNN 821 F 1 "D" V 2450 3450 50 0000 L CNN 822 F 2 "" H 2500 3350 50 0001 C CNN 823 F 3 "~" H 2500 3350 50 0001 C CNN 824 1 2500 3350 825 0 -1 -1 0 826 $EndComp 827 Wire Wire Line 828 2800 2900 2800 2800 829 Wire Wire Line 830 2800 2800 2500 2800 831 Connection ~ 2800 2800 832 Wire Wire Line 833 2800 2800 2800 2700 834 Wire Wire Line 835 2500 2800 2500 3200 836 Connection ~ 2500 2800 837 Wire Wire Line 838 2500 2800 2200 2800 839 Wire Wire Line 840 2200 3600 2500 3600 841 Wire Wire Line 842 2500 3600 2500 3500 843 Text GLabel 2800 3300 3 50 Input ~ 0 844 0V 845 Wire Wire Line 846 2800 3300 2800 3200 847 Wire Wire Line 848 2800 2400 2800 2300 849 $Comp 850 L Device:R R? 851 U 1 1 61DEAEDE 852 P 5950 3600 853 AR Path="/61DEAEDE" Ref="R?" Part="1" 854 AR Path="/624B50A6/61DEAEDE" Ref="R24" Part="1" 855 F 0 "R24" V 5743 3600 50 0000 C CNN 856 F 1 "2200R" V 5834 3600 50 0000 C CNN 857 F 2 "" V 5880 3600 50 0001 C CNN 858 F 3 "~" H 5950 3600 50 0001 C CNN 859 1 5950 3600 860 0 1 1 0 861 $EndComp 862 $Comp 863 L bc239:BC239 Q? 864 U 1 1 61DEB6DF 865 P 6500 3600 866 AR Path="/61DEB6DF" Ref="Q?" Part="1" 867 AR Path="/624B50A6/61DEB6DF" Ref="Q?" Part="1" 868 F 0 "Q?" H 6800 3650 50 0000 C CNN 869 F 1 "BC239" H 6800 3550 50 0000 C CNN 870 F 2 "Package_TO_SOT_THT:TO-92_Inline" H 6700 3525 50 0001 L CIN 871 F 3 "https://www.futurlec.com/Transistors/BC239.shtml" H 6500 3600 50 0001 L CNN 872 1 6500 3600 873 1 0 0 -1 874 $EndComp 875 Text GLabel 6600 3900 3 50 Input ~ 0 876 0V 877 Wire Wire Line 878 6600 3900 6600 3800 879 Wire Wire Line 880 6300 3600 6100 3600 881 Wire Wire Line 882 5800 3600 2500 3600 883 Connection ~ 2500 3600 884 $Comp 885 L Relay:UMS05-1A80-75L RL1 886 U 1 1 61DF6BB2 887 P 7500 3400 888 F 0 "RL1" V 6933 3400 50 0000 C CNN 889 F 1 "UMS05-1A80-75L" V 7024 3400 50 0000 C CNN 890 F 2 "Relay_THT:Relay_StandexMeder_UMS" H 7800 3350 50 0001 L CNN 891 F 3 "https://standexelectronics.com/de/produkte/ums-reed-relais/" H 7500 3400 50 0001 C CNN 892 1 7500 3400 893 0 1 1 0 894 $EndComp 895 Text Notes 7800 3450 0 50 ~ 0 896 Need more accurate part with\npins 3 and 5 as the switch pins. 897 $Comp 898 L Device:D D4 899 U 1 1 61DFA90A 900 P 7450 2700 901 F 0 "D4" H 7450 2484 50 0000 C CNN 902 F 1 "D" H 7450 2575 50 0000 C CNN 903 F 2 "" H 7450 2700 50 0001 C CNN 904 F 3 "~" H 7450 2700 50 0001 C CNN 905 1 7450 2700 906 -1 0 0 1 907 $EndComp 908 Text GLabel 8200 2500 1 50 Input ~ 0 909 5V 910 Wire Wire Line 911 7800 3200 8200 3200 912 Wire Wire Line 913 8200 3200 8200 2700 914 Wire Wire Line 915 7200 3600 7200 3700 916 Wire Wire Line 917 7200 3700 10000 3700 918 Wire Wire Line 919 10000 3700 10000 2000 920 Wire Wire Line 921 9400 2000 9400 3600 922 Wire Wire Line 923 9400 3600 7800 3600 924 Wire Wire Line 925 7600 2700 8200 2700 926 Connection ~ 8200 2700 927 Wire Wire Line 928 8200 2700 8200 2500 929 Wire Wire Line 930 6600 3400 6600 3200 931 Wire Wire Line 932 6600 3200 7200 3200 933 Wire Wire Line 934 7300 2700 6600 2700 935 Wire Wire Line 936 6600 2700 6600 3200 937 Connection ~ 6600 3200 938 Text Notes 2200 2600 2 50 ~ 0 939 The RC circuit is apparently used\n"to detect a continuous period\nof high tone on the cassette input". 940 $EndSCHEMATC