Implement audio pre-amp

kicad/cpu.sch

@@ -3,7 +3,7 @@ EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 3 4
+Sheet 4 4
 Title ""
 Date "2020-10-03"
 Rev ""
@@ -579,4 +579,12 @@ F 3 "" H 1600 4300 50  0001 C CNN
 $EndComp
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+Text HLabel 7150 4200 2    50   Input ~ 0
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+Text HLabel 7150 4300 2    50   Input ~ 0
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 $EndSCHEMATC

kicad/io.sch

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 Wire Wire Line
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+Text Notes 3500 7100 0    50   ~ 0
+TODO: Set sensible\ngain for input stage.
 $EndSCHEMATC

kicad/sabik-cpu-cache.lib

@@ -1,6 +1,41 @@
 EESchema-LIBRARY Version 2.4
 #encoding utf-8
 #
+# Amplifier_Operational_LM358
+#
+DEF Amplifier_Operational_LM358 U 0 5 Y Y 3 L N
+F0 "U" 0 200 50 H V L CNN
+F1 "Amplifier_Operational_LM358" 0 -200 50 H V L CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+ALIAS LM358 AD8620 LMC6062 LMC6082 TL062 TL072 TL082 NE5532 SA5532 RC4558 RC4560 RC4580 LMV358 TS912 TSV912IDT TSV912IST TLC272 TLC277 MCP602 OPA2134 OPA2340 OPA2376xxD OPA2376xxDGK MC33078 MC33178 LM4562 OP249 OP275 ADA4075-2 MCP6002-xP MCP6002-xSN MCP6002-xMS LM7332 OPA2333xxD OPA2333xxDGK LMC6482 LT1492 LTC6081xMS8 LM6172 MCP6L92 NJM2043 NJM2114 NJM4556A NJM4558 NJM4559 NJM4560 NJM4580 NJM5532 ADA4807-2ARM OPA2691 LT6233 OPA2356xxD OPA2356xxDGK OPA1612AxD MC33172 OPA1602 TLV2372
+$FPLIST
+ SOIC*3.9x4.9mm*P1.27mm*
+ DIP*W7.62mm*
+ TO*99*
+ OnSemi*Micro8*
+ TSSOP*3x3mm*P0.65mm*
+ TSSOP*4.4x3mm*P0.65mm*
+ MSOP*3x3mm*P0.65mm*
+ SSOP*3.9x4.9mm*P0.635mm*
+ LFCSP*2x2mm*P0.5mm*
+ *SIP*
+ SOIC*5.3x6.2mm*P1.27mm*
+$ENDFPLIST
+DRAW
+P 4 1 1 10 -200 200 200 0 -200 -200 -200 200 f
+P 4 2 1 10 -200 200 200 0 -200 -200 -200 200 f
+X ~ 1 300 0 100 L 50 50 1 1 O
+X - 2 -300 -100 100 R 50 50 1 1 I
+X + 3 -300 100 100 R 50 50 1 1 I
+X + 5 -300 100 100 R 50 50 2 1 I
+X - 6 -300 -100 100 R 50 50 2 1 I
+X ~ 7 300 0 100 L 50 50 2 1 O
+X V- 4 -100 -300 150 U 50 50 3 1 W
+X V+ 8 -100 300 150 D 50 50 3 1 W
+ENDDRAW
+ENDDEF
+#
 # Connector_AudioJack3
 #
 DEF Connector_AudioJack3 J 0 20 Y Y 1 F N

kicad/sabik-cpu.sch

@@ -19,40 +19,6 @@ U 5F7CBB94
 F0 "power" 50
 F1 "power.sch" 50
 $EndSheet
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 Wire Wire Line
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 Wire Wire Line
@@ -75,4 +41,46 @@ Wire Wire Line
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+$EndSheet
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 $EndSCHEMATC