(F3 D(V(g9 "000000000)(g3 "DMT)(g4 "CCSL))(…(G401010)(‡10)(„50)(gC "DateStamp.OS))(…(G1002)(„21)(gB "AutoSym.Top))(…(G201002)(„C)(gC "Package.List))(…(G5002)(‡10)(„4F)(gD "DateStamp.Dev))(…(G41002)(„37)(g9 "Delay.Dev))(…(G1010)(‡8)(„19)(g9 "PkgPrefix))(…(G1002)(„12)(g6 "Ground))(…(G1010)(‡10)(„E)(gD "PageRefFormat))(…(G1002)(‡10)(„D)(gB "Name.Prefix))(…(G1002)(„6)(g8 "Unit.All))(…(G101108)(‡10)(„3)(g7 "BusInfo))(…(G1002)(„33)(gA "Permutable))(…(G81002)(„24)(g8 "Restrict))(…(G1810)(„1C)(g7 "CctPath))(…(G1082)(„3A)(gF "TestVectors.Dev))(…(G41008)(„39)(gA "Invert.Pin))(…(G1002)(„2B)(g8 "Category))(…(G1802)(„1E)(gA "ExtCctPath))(…(G1010)(‡10)(„4D)(g5 "CctOS))(…(G45008)(„44)(gB "Initial.Pin))(…(G1002)(‡10)(„4C)(g8 "ExtCctOS))(…(G1002)(„20)(gC "AutoSym.Left))(…(G1002)(„13)(g5 "Power))(…(G105022)(‡10)(„7)(g4 "Unit))(…(G1002)(‡40)(„4E)(g9 "ExtCctLib))(…(G1002)(‡40)(„48)(gA "DWLSrcName))(…(G1010)(„36)(g8 "Revision))(…(G1002)(„22)(gD "AutoSym.Right))(…(G1010)(„46)(gC 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14C8)(\-1FB8 -2990 1FB8 2990)(]0 0 286A 1F1B)(_-12A1 -13AB 15C9 B70)(a(G5A)(o3(^0 0 834 834))(J(A8 A8)((g5 "Arial))(PA))(^-FDC -14C8 FDC 14C8)(H64)( 1 1)))))(ƒ(„1B)(G41810)(gF "Audio Mixer.cct))(ƒ(„1C)(G1810)(g1D "D:\dw4\Debug\Free Schematics\))(ƒ(„64)(G10)(g17 "(D(V2)(R1)(W0 0 0 0 1))))(ƒ(„51)(G1010)(gA "3017772205))(ƒ(„30)(gB "Name.Prefix))(ƒ(„2E)(g1 "/))(ƒ(„19)(G1010)(g1 "U))(ƒ(„18)(g3 "DEV))(ƒ(„17)(G1010)(g3 "SIG))(ƒ(„F)(g1 "4))(ƒ(„E)(g4 "P-XY))(ƒ(„29)(gC "Circuit1.cct))(b(r1B3 UU€ƒdƒƒ…PApple LaserWriter 16/600 PSœ´Gê odXLetterPRIVà''''R›ÿ…C-winspoolApple LaserWriter 16/600 PSLPT1:))(5(G1)(W260 -132E)((g5 "Arial))(PA)(gAD "Audio Mixer - Transistorized by John Lundgren 12-8-95 Ver 951219a A Basic Schematic Transcribed to DesignWorks by C. Dewhurst))(5(WA0C -964)((g5 "Arial))(P8)(gF "LOW-Z AUDIO OUT))(5(G1)(W21 87F)((g5 "Arial))(P8)(g3A6 "If two of these circuits are made in the same enclosure for stereo, then there can be a single power supply to run both of them. There should be a resistor in series with the incoming 9V+ lead so as to minimize crosstalk, and reduce the PLOP when it's powered on. R7 value will depend on the FET characteristics, which varies from FET to FET. Adjust the value to get half the supply voltage at the junction of the emitter of Q2 and R9. An earphone jack can be put on the output. A 1K to 8 ohm transformer can be used for each channel, two for stereo. The 1K primary would go to the output jack. The 8 ohm secondary would go to the earphone. Other features can be added to this basic mixer. One or more microphone preamps could be added. A VU level meter or LED bargraph can be added. The microphone preamps could have a transformer to match a low impedance microphone to the preamp input. Etc... ))(5(G1)(W4A0 -344)((gB "Courier New))(P8)(g169 "View of bottom of FET MPF102: labeling ----------- ( D S G ) \_______/ View of bottom of Transistor 2N3904: labeling ----------- ( E B C ) \_______/ ))(5(G1)(W-E7A 88B)((g5 "Arial))(P8)(g288 "Parts List C1, C2, C3 .47 uF 100V or more, preferably non-polarized and not electrolytic C4 220 uF 16V or more Electrolytic C5 470 uF or more 16V or more Electrolytic C6 22 uF 16V or more electrolytic J1, J2, J3, J4 Phone jacks or RCA Phono jacks. Q1 MPF102 FET Q2 2N3904 or 2N2222 or PN2222 NPN audio gen'l purp transistor R1, R2, R3 50K or 100K Audio Taper pots R4, R5, R6 220K ohm 5% 1/4W R7 4.7K ohm 5% 1/4W Adjust to get 1/2 batt voltage at emitter of Q2 R8 10K 5% 1/4W R9 2.2K 1/4W 5% S1 SPST on/off switch (could be on one of the pots) B1 Battery 9V or a well filtered 9V supply. ))(5(G3)(W-E70 1307)((g5 "Arial))(PA)(g46 "Source: http://www.ee.ualberta.ca/~charro/cookbook/audio/audmixer.asc))(5(G1)(W-44C 352)((g5 "Arial))(PA)(g3D "All resistors are 1/4 W 5% All capacitors are 16V or more. ))(<1(W-D20 -B36)(X48 1)(z1)(ƒ(G151106)(‚1(^(‘7)(W-CBE -B44)))(g2 "J1))(ƒ(„4F)(G5002)(gA "3017771874)))(<2(W-D20 -5BE)(X48 1)(z2)(ƒ(G151106)(‚1(^(‘7)(W-CBE -5CC)))(g2 "J2))(ƒ(„4F)(G5002)(gA "3017771879)))(<3(W-D20 -8C)(X48 1)(z3)(ƒ(G151106)(‚1(^(‘7)(W-CBE -9A)))(g2 "J3))(ƒ(„4F)(G5002)(gA "3017771882)))(<4(G2)(W-B36 302)(X3D 1)(z4))(<5(W-94C -B36)(IA)(X27 1)(z5)(ƒ(„1A)(G51002)(‚1(^(‘1)(W-8C0 -A3A)))(g6 "0.47uF))(ƒ(G151106)(‚1(^(‘4)(W-8C0 -B7C)))(g2 "C1))(ƒ(„4F)(G5002)(gA "3017771906)))(<6(W-94C -5BE)(IA)(X27 1)(z6)(ƒ(„1A)(G51002)(‚1(^(‘1)(W-8C0 -4C2)))(g6 "0.47uF))(ƒ(G151106)(‚1(^(‘4)(W-8C0 -604)))(g2 "C2))(ƒ(„4F)(G5002)(gA "3017771909)))(<7(W-762 -A64)(I1)(X27 2)(z8)(ƒ(G151106)(‚1(^(‘4)(W-674 -A9C)))(g2 "R1))(ƒ(„4F)(G5002)(gA "3017771950)))(<8(W-762 -4EC)(I1)(X27 2)(z9)(ƒ(G151106)(‚1(^(‘4)(W-674 -4DE)))(g2 "R2))(ƒ(„4F)(G5002)(gA "3017771952)))(<9(W-762 46)(I1)(X27 2)(zA)(ƒ(G151106)(‚1(^(‘4)(W-674 -38)))(g2 "R3))(ƒ(„4F)(G5002)(gA "3017771953)))((Y1 1)(=(G84C)-C94 -AAA -C08 -AAA))(>(Y5 2)(=(G874)-992 -AAA -906 -AAA)))))(B2(@2(?(z3)(Z-CEF -5E5 -8AB -4D7)(ƒ(G151107)(g4 "SIG3))(=-C08 -532 -992 -532)(>(Y2 1)(=(G84C)-C94 -532 -C08 -532))(>(Y6 2)(=(G874)-992 -532 -906 -532)))))(B3(@3(?(z5)(Z-CEF -B3 -8AB 5B)(ƒ(G151107)(g4 "SIG5))(=-C08 0 -992 0)(>(Y3 1)(=(G84C)-C94 0 -C08 0))(>(Y1F 2)(=(G874)-992 0 -906 0)))))(B4(@4(?(z8)(Z-88F -B5D -6C1 -9C3)(ƒ(G151107)(g4 "SIG8))(=-7A8 -AAA -71C -AAA)(>(Y5 1)(=(G86C)-834 -AAA -7A8 -AAA))(>(Y7 1)(=(G834)-71C -AAA -71C -A1E)))))(B5(@5(?(zA)(Z-88F -5E5 -6C1 -44B)(ƒ(G151107)(g5 "SIG10))(=-7A8 -532 -71C -532)(>(Y6 1)(=(G86C)-834 -532 -7A8 -532))(>(Y8 1)(=(G834)-71C -532 -71C -4A6)))))(B6(@6(?(zC)(Z-88F -B3 -6C1 E7)(ƒ(G151107)(g5 "SIG12))(=-7A8 0 -71C 0)(>(Y9 1)(=(G834)-71C 0 -71C 8C))(>(Y1F 1)(=(G86C)-834 0 -7A8 0)))))(B7(@7(?(zF)(Z-6A5 -9FF -4D7 -8F1)(ƒ(G151107)(g5 "SIG15))(>(Y7 2)(=(GC)-64A -94C -5BE -94C))(>(YA 2)(=(G14)-5BE -94C -532 -94C)))))(B8(@8(?(z12)(Z-6A5 -487 -4D7 -379)(ƒ(G151107)(g5 "SIG18))(>(Y8 2)(=(GC)-64A -3D4 -5BE -3D4))(>(YB 2)(=(G14)-5BE -3D4 -532 -3D4)))))(B9(@9(?(z15)(Z-6A5 AB -4D7 1B9)(ƒ(G151107)(g5 "SIG21))(>(Y9 2)(=(GC)-64A 15E -5BE 15E))(>(YC 2)(=(G14)-5BE 15E -532 15E)))))(BA(@A(?(z17)(Z-42F -9FF 15 1B9)(ƒ(G151107)(g5 "SIG23))(=(G1)-276 -94C -D2 -94C)(=(G842)-276 -94C -276 -3D4)(=(G840)-348 -94C -276 -94C)(=(G820)-276 -3D4 -276 15E)(=(G840)-348 15E -276 15E)(=(G840)-348 -3D4 -276 -3D4)(>(YC 1)(=(G84C)-3D4 15E -348 15E))(>(YA 1)(=(G84C)-3D4 -94C -348 -94C))(>(YB 1)(=(G84C)-3D4 -3D4 -348 -3D4))(>(YD 1)(=(G874)-D2 -94C -46 -94C)))))(BB(@B(?(z1F)(ZAB -BD7 58D -A09)(ƒ(G151107)(g5 "SIG31))(=15E -AF0 4A6 -AF0)(>(YD 3)(=(G835)15E -AF0 15E -A64))(>(Y13 2)(=(G84C)15E -B7C 15E -AF0))(>(Y14 1)(=(G874)4A6 -AF0 532 -AF0)))))(BC(@C(?(z1E)(Z-F9 -88F 1B9 -635)(ƒ(G151107)(g5 "SIG30))(=(G2)-46 -7A8 15E -7A8)(=-46 -7A8 -46 -71C)(>(YF 1)(=(G14)-46 -71C -46 -690))(>(YD 2)(=(GC)15E -834 15E -7A8))(>(YE 1)(=(G14)15E -7A8 15E -71C)))))(BD(@D(?(z2B)(Z5DD -A33 777 -865)(ƒ(G151107)(g5 "SIG43))(>(Y14 2)(=(GE)690 -9D8 690 -94C))(>(Y15 1)(=(G14)690 -94C 690 -8C0))(>(Y16 1)(=(G14)690 -94C 71C -94C)))))(BE(@E(?(z28)(Z-849 -11A7 6EB -BAD)(ƒ(G151107)(g5 "SIG40))(=-604 -10F4 15E -10F4)(=(G2)15E -10F4 15E -E7E)(=(G842)-762 -10F4 -604 -10F4)(=(G860)690 -E7E 690 -C94)(=(G860)15E -E7E 15E -D66)(=(G820)-604 -10F4 -604 -F96)(=(G860)15E -E7E 690 -E7E)(>(Y14 3)(=(G874)690 -C94 690 -C08))(>(Y13 1)(=(G834)15E -D66 15E -CDA))(>(Y1B 2)(=(G84C)-7EE -10F4 -762 -10F4))(>(Y1D 1)(=(G834)-604 -F96 -604 -F0A)))))(BF(@F(?(z30)(Z793 -9FF 961 -8F1)(ƒ(G151107)(g5 "SIG48))(>(Y16 2)(=(GC)7EE -94C 87A -94C))(>(Y17 1)(=(G14)87A -94C 906 -94C)))))(B10(@10(?(z36)(Z-CBB -11A7 -A4F -100D)(ƒ(G151107)(g5 "SIG54))(=-C08 -10F4 -B36 -10F4)(>(Y1A 2)(=(G834)-C08 -10F4 -C08 -1068))(>(Y1B 1)(=(G874)-B36 -10F4 -AAA -10F4)))))(B11(@11(?(G8)(z3E)(Z-7CF -3A3 -6C1 -1D5)(ƒ(G151106)(g3 "GND))(>(Y8 3)(=(G84C)-71C -348 -71C -2BC))(>(Y20 1)(=(G14)-71C -2BC -71C -230)(T0)))(?(G8)(z26)(Z-7CF -91B -6C1 -74D)(ƒ(G151106)(g3 "GND))(>(Y7 3)(=(G84C)-71C -8C0 -71C -834))(>(Y21 1)(=(G14)-71C -834 -71C -7A8)(T0)))(?(G8)(z3F)(Z-CEF -B17 -A4F 35D)(ƒ(G151106)(g3 "GND))(=-AAA 46 -AAA 276)(=(G842)-AAA -4EC -AAA 46)(=(G840)-C08 46 -AAA 46)(=(G842)-AAA -A64 -AAA -4EC)(=(G840)-C08 -4EC -AAA -4EC)(=(G840)-C08 -A64 -AAA -A64)(>(Y1 2)(=(G84C)-C94 -A64 -C08 -A64))(>(Y2 2)(=(G84C)-C94 -4EC -C08 -4EC))(>(Y4 1)(=(G874)-AAA 276 -AAA 302)(T0))(>(Y3 2)(=(G84C)-C94 46 -C08 46)))(?(G8)(z3B)(Z-6B7 -E93 -5A9 -CC5)(ƒ(G151106)(g3 "GND))(>(Y1D 2)(=(GC)-604 -E38 -604 -DAC))(>(Y1E 1)(=(G14)-604 -DAC -604 -D20)(T0)))(?(G8)(z35)(Z-CBB -F65 -BAD -D97)(ƒ(G151106)(g3 "GND))(>(Y1A 1)(=(GC)-C08 -F0A -C08 -E7E))(>(Y1C 1)(=(G14)-C08 -E7E -C08 -DF2)(T0)))(?(G8)(z32)(Z7C7 -9B9 961 -5EF)(ƒ(G151106)(g3 "GND))(=87A -906 87A -6D6)(>(Y17 2)(=(G834)87A -906 906 -906))(>(Y19 1)(=(G874)87A -6D6 87A -64A)(T0)))(?(G8)(z2E)(Z5DD -7BD 6EB -5EF)(ƒ(G151106)(g3 "GND))(>(Y15 2)(=(GC)690 -762 690 -6D6))(>(Y18 1)(=(G14)690 -6D6 690 -64A)(T0)))(?(G8)(z2)(Z-7CF 18F -6C1 35D)(ƒ(G151106)(g3 "GND))(>(Y9 3)(=(G84C)-71C 1EA -71C 276))(>(Y12 1)(=(G874)-71C 276 -71C 302)(T0)))(?(G8)(z21)(ZAB -619 1B9 -44B)(ƒ(G151106)(g3 "GND))(>(YE 2)(=(GC)15E -5BE 15E -532))(>(Y11 1)(=(G14)15E -532 15E -4A6)(T0)))(?(G8)(z23)(Z-F9 -619 15 -44B)(ƒ(G151106)(g3 "GND))(>(YF 2)(=(GC)-46 -5BE -46 -532))(>(Y10 1)(=(G14)-46 -532 -46 -4A6)(T0)))))))