pcb/chiptunes-flex/chiptunes-flex.sch

   1 EESchema Schematic File Version 4
   2 EELAYER 30 0
   3 EELAYER END
   4 $Descr A4 11693 8268
   5 encoding utf-8
   6 Sheet 1 1
   7 Title ""
   8 Date ""
   9 Rev ""
  10 Comp ""
  11 Comment1 ""
  12 Comment2 ""
  13 Comment3 ""
  14 Comment4 ""
  15 $EndDescr
  16 $Comp
  17 L MCU_Microchip_ATtiny:ATtiny4-TS U1
  18 U 1 1 5F194EBF
  19 P 4850 3600
  20 F 0 "U1" H 4320 3646 50  0000 R CNN
  21 F 1 "ATtiny4-TS" H 4320 3555 50  0000 R CNN
  22 F 2 "Package_TO_SOT_SMD:SOT-23-6" H 4850 3600 50  0001 C CIN
  23 F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8127-AVR-8-bit-Microcontroller-ATtiny4-ATtiny5-ATtiny9-ATtiny10_Datasheet.pdf" H 4850 3600 50  0001 C CNN
  24         1    4850 3600
  25         1    0    0    -1
  26 $EndComp
  27 $Comp
  28 L Device:R R1
  29 U 1 1 5F195255
  30 P 5650 3000
  31 F 0 "R1" H 5720 3046 50  0000 L CNN
  32 F 1 "100k" H 5720 2955 50  0000 L CNN
  33 F 2 "Resistor_SMD:R_0805_2012Metric" V 5580 3000 50  0001 C CNN
  34 F 3 "~" H 5650 3000 50  0001 C CNN
  35         1    5650 3000
  36         1    0    0    -1
  37 $EndComp
  38 $Comp
  39 L Device:Battery_Cell #BT1
  40 U 1 1 5F1956B2
  41 P 7450 3600
  42 F 0 "#BT1" H 7333 3696 50  0001 R CNN
  43 F 1 "CR927" H 7850 3650 50  0000 R CNN
  44 F 2 "" V 7450 3660 50  0001 C CNN
  45 F 3 "~" V 7450 3660 50  0001 C CNN
  46         1    7450 3600
  47         1    0    0    -1
  48 $EndComp
  49 $Comp
  50 L power:GND #PWR0101
  51 U 1 1 5F1959C5
  52 P 7450 3700
  53 F 0 "#PWR0101" H 7450 3450 50  0001 C CNN
  54 F 1 "GND" H 7455 3527 50  0000 C CNN
  55 F 2 "" H 7450 3700 50  0001 C CNN
  56 F 3 "" H 7450 3700 50  0001 C CNN
  57         1    7450 3700
  58         1    0    0    -1
  59 $EndComp
  60 $Comp
  61 L power:+3V0 #PWR0102
  62 U 1 1 5F195F35
  63 P 7450 3400
  64 F 0 "#PWR0102" H 7450 3250 50  0001 C CNN
  65 F 1 "+3V0" H 7465 3573 50  0000 C CNN
  66 F 2 "" H 7450 3400 50  0001 C CNN
  67 F 3 "" H 7450 3400 50  0001 C CNN
  68         1    7450 3400
  69         1    0    0    -1
  70 $EndComp
  71 $Comp
  72 L power:+3V0 #PWR0103
  73 U 1 1 5F196204
  74 P 4850 3000
  75 F 0 "#PWR0103" H 4850 2850 50  0001 C CNN
  76 F 1 "+3V0" H 4865 3173 50  0000 C CNN
  77 F 2 "" H 4850 3000 50  0001 C CNN
  78 F 3 "" H 4850 3000 50  0001 C CNN
  79         1    4850 3000
  80         1    0    0    -1
  81 $EndComp
  82 $Comp
  83 L power:GND #PWR0104
  84 U 1 1 5F196445
  85 P 4850 4200
  86 F 0 "#PWR0104" H 4850 3950 50  0001 C CNN
  87 F 1 "GND" H 4855 4027 50  0000 C CNN
  88 F 2 "" H 4850 4200 50  0001 C CNN
  89 F 3 "" H 4850 4200 50  0001 C CNN
  90         1    4850 4200
  91         1    0    0    -1
  92 $EndComp
  93 $Comp
  94 L Device:Speaker #LS1
  95 U 1 1 5F196D45
  96 P 6800 3300
  97 F 0 "#LS1" H 6763 3617 50  0001 C CNN
  98 F 1 "Speaker" H 6763 3525 50  0001 C CNN
  99 F 2 "" H 6800 3100 50  0001 C CNN
 100 F 3 "~" H 6790 3250 50  0001 C CNN
 101         1    6800 3300
 102         1    0    0    -1
 103 $EndComp
 104 Wire Wire Line
 105         5450 3300 5650 3300
 106 Wire Wire Line
 107         5450 3500 5650 3500
 108 Wire Wire Line
 109         5650 3500 5650 3300
 110 Connection ~ 5650 3300
 111 Wire Wire Line
 112         5650 3300 5650 3150
 113 $Comp
 114 L power:GND #PWR0105
 115 U 1 1 5F1981AF
 116 P 6600 3450
 117 F 0 "#PWR0105" H 6600 3200 50  0001 C CNN
 118 F 1 "GND" H 6605 3277 50  0000 C CNN
 119 F 2 "" H 6600 3450 50  0001 C CNN
 120 F 3 "" H 6600 3450 50  0001 C CNN
 121         1    6600 3450
 122         1    0    0    -1
 123 $EndComp
 124 $Comp
 125 L power:+3V0 #PWR0106
 126 U 1 1 5F198416
 127 P 5650 2850
 128 F 0 "#PWR0106" H 5650 2700 50  0001 C CNN
 129 F 1 "+3V0" H 5665 3023 50  0000 C CNN
 130 F 2 "" H 5650 2850 50  0001 C CNN
 131 F 3 "" H 5650 2850 50  0001 C CNN
 132         1    5650 2850
 133         1    0    0    -1
 134 $EndComp
 135 NoConn ~ 5450 3400
 136 NoConn ~ 5450 3600
 137 Wire Wire Line
 138         6600 3450 6600 3400
 139 $Comp
 140 L Connector:TestPoint_Small TP3
 141 U 1 1 5F19A878
 142 P 6600 3300
 143 F 0 "TP3" H 6700 3400 50  0000 L CNN
 144 F 1 "audio+" H 6950 3300 50  0001 L CNN
 145 F 2 "TestPoint:TestPoint_Pad_D2.0mm" H 6800 3300 50  0001 C CNN
 146 F 3 "~" H 6800 3300 50  0001 C CNN
 147         1    6600 3300
 148         1    0    0    -1
 149 $EndComp
 150 Connection ~ 6600 3300
 151 $Comp
 152 L Connector:TestPoint_Small TP4
 153 U 1 1 5F19AD90
 154 P 6600 3400
 155 F 0 "TP4" H 6700 3300 50  0000 L CNN
 156 F 1 "audio-" H 6950 3400 50  0001 L CNN
 157 F 2 "TestPoint:TestPoint_Pad_D2.0mm" H 6800 3400 50  0001 C CNN
 158 F 3 "~" H 6800 3400 50  0001 C CNN
 159         1    6600 3400
 160         1    0    0    -1
 161 $EndComp
 162 Connection ~ 6600 3400
 163 $Comp
 164 L Connector:TestPoint_Small TP1
 165 U 1 1 5F19AF7A
 166 P 7450 3400
 167 F 0 "TP1" H 7600 3350 50  0000 L CNN
 168 F 1 "bat+" H 7498 3355 50  0001 L CNN
 169 F 2 "TestPoint:TestPoint_Pad_D2.0mm" H 7650 3400 50  0001 C CNN
 170 F 3 "~" H 7650 3400 50  0001 C CNN
 171         1    7450 3400
 172         1    0    0    -1
 173 $EndComp
 174 Connection ~ 7450 3400
 175 $Comp
 176 L Connector:TestPoint_Small TP2
 177 U 1 1 5F19B282
 178 P 7450 3700
 179 F 0 "TP2" H 7600 3750 50  0000 L CNN
 180 F 1 "bat-" H 7498 3655 50  0001 L CNN
 181 F 2 "TestPoint:TestPoint_Pad_D2.0mm" H 7650 3700 50  0001 C CNN
 182 F 3 "~" H 7650 3700 50  0001 C CNN
 183         1    7450 3700
 184         1    0    0    -1
 185 $EndComp
 186 Connection ~ 7450 3700
 187 $Comp
 188 L Device:R R2
 189 U 1 1 5F1D9E27
 190 P 6000 3300
 191 F 0 "R2" V 5793 3300 50  0000 C CNN
 192 F 1 "200" V 5884 3300 50  0000 C CNN
 193 F 2 "Resistor_SMD:R_0805_2012Metric" V 5930 3300 50  0001 C CNN
 194 F 3 "~" H 6000 3300 50  0001 C CNN
 195         1    6000 3300
 196         0    1    1    0
 197 $EndComp
 198 $Comp
 199 L Device:C C1
 200 U 1 1 5F1DA44F
 201 P 6150 3450
 202 F 0 "C1" H 6265 3496 50  0000 L CNN
 203 F 1 "100n" H 6265 3405 50  0000 L CNN
 204 F 2 "Capacitor_SMD:C_0805_2012Metric" H 6188 3300 50  0001 C CNN
 205 F 3 "~" H 6150 3450 50  0001 C CNN
 206         1    6150 3450
 207         1    0    0    -1
 208 $EndComp
 209 Wire Wire Line
 210         5650 3300 5850 3300
 211 Wire Wire Line
 212         6150 3300 6600 3300
 213 Connection ~ 6150 3300
 214 $Comp
 215 L power:GND #PWR0107
 216 U 1 1 5F1E259E
 217 P 6150 3600
 218 F 0 "#PWR0107" H 6150 3350 50  0001 C CNN
 219 F 1 "GND" H 6155 3427 50  0000 C CNN
 220 F 2 "" H 6150 3600 50  0001 C CNN
 221 F 3 "" H 6150 3600 50  0001 C CNN
 222         1    6150 3600
 223         1    0    0    -1
 224 $EndComp
 225 Text Notes 5700 4300 0    50   ~ 0
 226 To remove the 16kHz noise (base \nfrequency of the PWM), we use this \nlow-pass filter that has a cut-off \nfrequency of ca. 8kHz.
 227 Text Notes 5850 2750 0    50   ~ 0
 228 Typical impedance of a line input is \n10-100kOhm, so we can't use the \nAtTiny's internal pull-ups (20-50kOhm).
 229 $EndSCHEMATC