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Extremely Low Frequency (ELF) Receiver

Arduino + ADC = ELF

Extremely Low Frequency (ELF) Receiver
You can in fact receive some extremely interesting signals between 0 Hz and the ‘railway’ frequency of 16-2/3 Hz. Using the receiver described here with an ADC module described in a separate article and some free PC software it is possible to receive and make recordings of these signals.
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Component list
R1,R14,R15 = 100kOhm
R2 = 10MOhm
R3 = 10kOhm
R4 = 470kOhm
R5 = 390kOhm
R6 = 120kOhm
R7 = 56kOhm
R8 = 22kOhm
R9 = 180kOhm
R10,R12 = 18kOhm
R11 = 220kOhm
R13 = 150kOhm
R16 = 47kOhm
R23 = 1.5kOhm
P1 = 1MOhm trimpot
C1 = 10nF
C2 = 220nF
C3 = 68nF
C4 = 330nF
C5 = 47nF
C6 = 1µF
C7 = 22nF
C8,C9,C18,C19 = 47µF 25V
C10–C17,C20,C21,C27 = 100nF
C22,C23 = 10µF 63V
C24 = 2.2µF, Wima MKS2D042201N00KSSD
C25,C28 = 100µF, 25V
C26 = 1000µF, 16V, Nichicon TVX1C102MCD
L1 = 100µH 0.12Ohm, 1A, Bourns RLB1314-101KL
L2,L3 = 100µH 4.1 Ohm, 165mA, Bourns 78F101J-RC
L4 = 2x47µH, 0.6Ohm, 900mA, double choke 744878470 (Würth Elektronik)
D1 = LED
IC1,IC2 = OP07CP
IC3 = TL074CN
IC4 = IFX25001TS V50 (Infineon, LDO REG, 5V, 400mA, TO220-3)
MOD1 = TMA 0512D (Tracopower)
K1,K3,BT1 = 2-way PCB screw terminal block, 0.2’’ pitch
K2/S1 = 6-pin (2x3) pinheader, 0.1’’ pitch, with jumper, or 12-way rotary switch (alternatively 2x6 or 3x4)
S2 = on/off switch, SPST (min. 20 VDC/1 A)
BT1 = 6V battery, e.g. 4 AAA in holder
TP1-TP3 = solder pins
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