Measurement Filter for Class D
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Materials
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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Component list
R1,R3 = 1kOhm, 5%, 7 W (Tyco Electronics ER581K0JT)
R2 = 59Ohm, 1%, 0.6W*
P1 = 100Ohm, 10%, 0.5W, 24 turn trimpot (Vishay Spectrol M64W101KB40)
Capacitors
C1,C14,C18 = not used
C2,C5,C11,C13 = 1nF, 1%, 500V, silver mica (Cornell Dubilier CD19FD102FO3F)
C3,C8,C12 = 120pF, 1%, 500V, silver mica (Cornell Dubilier CD15FD121FO3F)
C4 = 6.8pF, 1%, 500V, silver mica (Cornell Dubilier CD15CD(6.8)DO3F)
C6,C15 = 270pF, 1%, 500V, silver mica (Cornell Dubilier CD15FD271FO3F)
C7,C9,C17 = 680pF, 1%, 500V, silver mica (Cornell Dubilier CD19FD681FO3F)
C10 = 180pF, 1%, 500V, silver mica (Cornell Dubilier CD15FD181FO3F)
C16 = 220pF, 1%, 500V, silver mica (Cornell Dubilier CD15FD221FO3F)
C19 = 5-57pF PTFE trimmer, 250V, (Vishay BCcomponents BFC2 809 08003)
Inductors (incl. materials)
L1 = 1.15mH, 85 turns 0.8 mm enamelled copper wire*
L2 = 689µH, 65.5 turns 0.8 mm enamelled copper wire*
L3 = 557µH, 59 turns 0.8 mm enamelled copper wire*
L4 = 802µH, 71 turns 0.8 mm enamelled copper wire*
L1-L4 core = RM14 core set, 160nH (AL) N41 (Epcos B65887E160A41), e.g. RS Components #212-6772
RM14 12-pin coil former (Epcos B65888C1512T1), e.g. RS #212-6839
RM 14 clamp, stainless steel spring (Epcos B65888A2002X, 2 per coil), e.g. RS Components #647-9323
RM 14 isolation washer. base (Epcos B65888B2005X), e.g. RS Components #180-121
0.8 mm enamelled copper wire (Pro Power ECW0.80). Nearest US equivalent: AWG20
Miscellaneous
K1,K2 = BNC socket, PSB mount, angled, 75Ohm (Tyco Electronics 1-1478032-0)
Locking washer, BNC/TNC (Tyco Electronics 1-1634817-0)
Nut, BNC/TNC (Tyco Electronics 1-1634816-0)
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