Elecraft AF1 Audio Filter - Manual (Page 2)

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“(brn-blk-red)”. Look for the color band sequence starting near one end of the component. Some resistors have dark blue
bodies that make identifying the colors difficult. Use your DMM to verify the value if you aren’t sure. Remember that your
DMM usually will indicate a value close to, but not exactly what is shown, due to normal tolerances in the components and
the DMM.
There may be more numbers, letters or color bands on a component than those shown in parenthesis. The additional markings
may change from unit to unit and are not important for identifying the part supplied with the kit.
Reference. Designator Description Qty
Part
Number
Misc. AF1 Audio Filter Printed Circuit Board 1 E100310
B1 Battery Holder 1 E980074
C1, C10 1µF 50V Electrolytic Capacitor 2 E530022
C2, C3, C11 470µF 25V Electrolytic Capacitor 3 E530084
C4, C7, C8 , C9, C13 .01µF (103) Capacitor 5 E530009
C5 .0022µF (222) Capacitor 1 E530054
C6 .1µF (104) Capacitor 1 E530011
C12 .047µF (473) Capacitor 1 E530025
R1 1.5k (brn-grn-blk-brn-brn) 1/4W Resistor 1 E500034
R2, R4, R7, R14 1.0k (brn-blk-red) 1/4W Resistor 4 E500013
R3 15k (brn-grn-org) 1/4W Resistor 1 E500060
R6 10k (brn-blk-org) 1/4W Resistor 1 E500015
R8, R11 180k (brn-gry-yel) 1/4W Resistor 2 E500068
R9, R12 680Ω ((blu-gry-brn) 1/4W Resistor 2 E500040
R17, R13 360k (org-blu-yel) 1/4W Resistor 2 E500264
R16 10Ω (brn-blk-blk) 1/4W Resistor 1 E500054
R18 22k (red-red-org) 1/4W Resistor 1 E500090
R10 5k dual potentiometer, linear taper, 6 pin 1 E520019
R15 10K (10KD) potentiometer 1 E520018
R5 50K (50KB) potentiometer 1 E520017
D1, D2 1N4007 Diode 2 E560001
D3 LED, Red, Ultra bright 1 E570025
J1, J3 Jack, Stereo, 3.5 mm 2 E620027
J2 Jack, 2.1 mm, 12VDC power 1 E620026
SW1 Switch, Rotary, 3 Pole, 4 Position, Non-Shorting, PC 1 E640033
U1 LM348 Integrated Circuit 1 E850231
U2 LM386 Integrated Circuit 1 E600022
Hardware Screw, Pan Head, Black Machine, 4-40 4 E700008
Hardware Lock Washer, Internal Tooth, #4 4 E700010
Hardware Nut, #4-40 4 E700011
Misc Knob w/set screw for 1/4 inch shaft 4 E700118
Misc Rubber Foot 4 E700024
Misc #24 Wire, Solid, Green, Insulated 6” E760008
Assembly Options
The AF1 is designed to operate as a stand-alone unit without an enclosure. In the event you want to build it into existing
equipment or its own enclosure:
1. Four holes are provided in the board that you may use with your own #4 hardware and spacers as needed to mount
the unit instead of using the rubber feet.
2. The battery may be mounted on the top (component side) or bottom of the board or you may choose not to install the
battery holder if you are going to power your AF1 only from an external source.