Android Elektorcardioscope (Part 3)
Construction, adjustments, and operating instructions

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Materials
Component list
Resistors
Default: SMD 0603 shape, 1%
R1,R13,R15,R18,R19,R20,R33,R34,R54 = 10kOhm 0.25W
R2, R12 = 3.3kOhm
R3 = 523kOhm
R4 = 300kOhm
R6 = 150Ohm
R7–R11,R23 = 1kOhm
R14,R53,R55,R56,R57,R59–R62 = 100kOhm
R5,R16,R17,R35 = 1MOhm
R21,R36,R37,R38 = 330kOhm
R22 = 100Ohm
R24,R65 = 390kOhm
R25,R29 = 47MOhm 5%
R26,R30 = 10MOhm
R27,R31 = 2.2MOhm
R28,R32 = 470kOhm
R39,R40,R49–R52 = 47kOhm
R41,R42,R45,R46 = 28.7kOhm
R43,R44 = 1.4MOhm
R47,R48 = 45.3kOhm
R58 = 9.1kOhm
R63,R64 = 27Ohm
P1,P2 = 5kOhm 20% adjustable (Vishay TS53YJ502MR10)
P3 = 2kOhm 20% adjustable (Vishay TS53YJ202MR10)
Capacitors
Default: SMD 0603
C1,C13 = 33µF 6.3V, tantalum (case A)
C2,C4,C7,C9,C12,C14 = 10µF 6.3V, X5R
C3,C5,C6,C8,C10,C15,C21,C22,C23,C24,C39,C40,C41,C42,C43,C44 = 100nF 25V, X7R
C11,C16,C25,C26,C31–C38 = 1µF 10V, X5R
C17–C20 = 1nF 50V, X7R*
C27, C29 = 470pF 50V, 5%,NP0
C28, C30 = 47nF 25V 5%, X7R
* C18, C19, C20 are 1 nF 50V, not 100 nF 50V as shown in the schematic.
Inductors
L1 = 4.7µH 20% 0.5A (Wuerth 744032004)
L2–L9 = ferrite bead, 30Ohm @ 100MHz (Murata BLM18PG330SN1D)
Semiconductor
D1, D2 = BAV99S
D3, D4 = LED, red, (PLCC-4)
T1 = PSMN6R5-25YLC NMOSFET
IC1 = PIC24FJ32GA002-I/SS, programmed, Elektor # 120107-41
IC2 = TPS60403DBVT
IC3–IC7 = TLC2252AIDRG4
IC8 = LMC6482AIMX/NOPB
IC9 = DG4053 AEQ-T1-E3
IC10, IC11 = CD74HC4052PW
IC12 = MCP1640BT-I/CHY
IC13 = LTC1981ES5#TRMPBF
Miscellaneous
K1 = 5-pin pinheader, 0.1’’ pitch
K2 = 6-pin pinheader, 0.1’’ pitch
K3 = 2-pin pinheader, 0.1’’ pitch
MOD1 = Bluetooth module, Roving Networks/Microchip type RN-42
S1,S2,S3 = pushbutton, Omron type SPNO B3FS-1052) with cap, Omron type B32-2010
Case, Pactec PPL-2AA
PCB, Elektor # 120107-1 or
Assembled module, ready for use, Elektor # 120107-91
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