Spiral MicroTesla
sparks from a USB charger
Materials
Extra info / Update
* Uses printed PCB coils
* Powered by USB charger or adapter
* Safe sparks
* Complete DIY kit available
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Green and Gold members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Bill of Materials
Resistors
Default: 1%, 0.125W, SMD 0805
R1,R2,R3,R4 = 10kOhm
R5 = 47kOhm
R6,R7 = 2.2kOhm
R8 = 150kOhm
R9, R11,R12,R13 = 33kOhm
R10,R18,R19,R20,R21,R22 = 120Ohm
R14,R15,R16,R17,R23 = 330Ohm
R24 = 0.1Ohm, 250mW, 1%, SMD 1206
R25 = 1.5kOhm
R26 = 68Ohm, 250mW, 5%, SMD 1206
R27 = 10Ohm
R28,R29 = 100kOhm
Capacitors
C1,C2,C3 = 47nF, 400VDC, 5%, PP, 15mm pitch, 5mm width
C4,C5,C19,C21,C23 = 10µF, 35V, 10%, SMD 1210, X7R
C6,C7,C8,C9,C10,C11,C12,C32 = 220nF, 50V, 20%, SMD 0805, Y5V
C13,C14,C15,C16,C17,C18 = 10nF, 50V,10 %, SMD 0805, X7R
C20 = 2.2µF, 50V, 10%, SMD 0805, X5R
C22 = 220pF, 50V, 5%, SMD 0805, C0G/NP0
C24,C25,C26,C27,C28,C29,C30,C31 = 220µF, 35V, 20%, 8mm diam., 3.5mm pitch, EEUFC1V221L (Panasonic)
C33,C34,C35 = 4.7µF, 16V, 10%, SMD 0805, X7R
Inductor
L1 = 6.8µH, 3.04A, 0.0498Ohm, SMD
Semiconductors
D1 = SP0504SHTG, SMD SOT-23-6
D2 = VSSA310S-M3/61T, 100V/3A, SMD SMA
D3 = BAT54S, SMD SOT-23
D4 = BAV99, SMD SOT-23
LED1 = red, low power, SMD, KPTL-3216EC (Kingbright)
LED2,LED3,LED4,LED5 = blue, low power, SMD, KPTL-3216QBC-D (Kingbright)
T1 = DMP1045U, SMD SOT-23
T2,T3 = IRLML2030TRPBF, SMD SOT-23
T4,T6 = FZT851, SMD SOT-223
T5,T7 = FZT951, SMD SOT-223
IC1 = LT3477EFE#PBF, SMD, TSSOP-20
IC2 = UCC27537DBVT, SMD SOT-23-5
IC3 = UCC27536DBVT, SMD SOT-23-5
IC4 = SN74LVC1G04DBVR, SMD SOT-23-5
IC5 = PIC18F14K50-I/SS, SMD SSOP-20
Miscellaneous
X1 = 12.0MHz resonator, 0.5%, 5pF with internal capacitors, AWSCR-12.00CV-T (Abracon)
K1 = USB-B mini-connector, horizontal PCB-mounting, SMD
K2 = turned-pin IC socket (only one contact required)
K4 = 6-pin SIL pinheader, 0.1’’ pitch
S1 = pushbutton, horizontal, SKHHLQA010 (Alps)
Mechanical components
8 spacers 15 mm
4 bolts M3 x 40 mm plus nuts
Acrylic sheet top, 100x150x2 mm
Acrylic sheet bottom, 100x150x2 mm
Miscellaneous:
PCB 160498-1 v1.4
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