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![Page 1: W8FGU FAOB Instuctions K2 FAOB Instuctions.pdf · À s v t o o P Z v ^ À ] ] v P o ( [ o ] > ] v } ( W } µ t ô&'h < î & ] Æ µ ] } K µ µ } / v o o ] } v v µ u](https://reader030.pdfslide.us/reader030/viewer/2022041013/5ec40419e1b8d145b761d48b/html5/thumbnails/1.jpg)
Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products
W8FGU K2 Fixed Audio Output Board Installation Addendum 09 December 2019
This document outlines some of the differences in the building and installation of the K2 Fixed Audio Output Board as a kit I now provide solely based on the design by Don Wilhelm, W3FPR and Tom Hammond, N0SS (SK). Please refer to the document w3fpr_K2 audio Fix.pdf for all references to operation and circuit description of this board.
I have received a number of requests to put a kit together that includes all parts necessary to install this board in a K2 or K2/100. Due to part availability and changes in part numbers, there are a few differences in this current kitted version and previous versions described in Don and Tom’s previous document. I also changed a couple of the methods to bring the audio output to the rear panel. These changes and pictures of, are documented in the following.
The following is a table of the current bill of materials with current part numbers and vendors:
Part Number Vendor Description Quantity
81-RCER71E104K0A2H3B Mouser 0.1uf (104) 25V 3.00
647-UMF1V010MDD Mouser 1uf 35V Electrolyte 1.00
80-ESS226M016AC2AA Mouser 22uf 16V Electrolyte 1.00
603-CFR-25JB-52-10R Mouser 10 ohm 1/4W 1.00
603-CFR-25JB-52-5K1 Mouser 5.1K ohm 1/4 2.00
926-LM386N-1/NOPB Mouser LM386 Mono AF Amp 1.00
164-4215 Mouser RCA Phone Jack - Black 1.00
538-150176-1021 Mouser Molex 2-pos plug 1.00
538-150178-1020 Mouser Molex 2-pos receptacle 1.00
538-150181-1020 Mouser Molex Female Terminal 2.00
538-150180-1020 Mouser Molex Male Terminal 2.00
Amazon AmerTac - Zenith AS110024C 100-Feet 24 AWG Speaker Wire 1.00
Amazon Antrader IDC 1.27mm Grey Color Flat Ribbon Cable for 2.54mm
Connectors, 20P-16Ft/5M 0.50
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Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products N0SS AUDIO FIX FOR K2 Far
Circuits Fixed Audio Output PCB 1.00
148786 Fastenal 4-40 3/16" pan head black oxide (these are the same screws used as “Chassis screws” on many of Elecraft’s products)
2.00
1133705 Fastenal #4 Zinc internal tooth lockwasher 2.00
145973 Fastenal 3/16" x 1/4" x 4-40 aluminum standoff hex 1.00
All parts needed for installation are provided in the kit including hardware and hookup wire:
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Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products As usual, please use static precautions when handling the LM386 part.
Here is a completed board ready for installation:
I chose to mount the PCB on a ¼” standoff on the Control Board in the unused hole, similar to the previous installation instructions. Use the provided 4-40 3/16” screws with lock washers to secure the standoff and the PCB as shown below:
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Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products The PCB is then mounted upside down to the standoff. The PCB with parts facing up will fit without touching the Front Panel but it is fairly tight. Mounting it upside down provides plenty of clearance and tucks in nicely between the boards:
Here is an alternative mounting method for those with newer K2’s that have the encoder PCB mounted behind the Front Panel Board. The boards overlap unless rotated 90 degrees. I drilled another 1/8” hole in the PCB to offset the board so it won’t interfere with the standoff that mounts to the hole to the left of the board:
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Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products In the previous installation document, the suggested mounting of the RCA jack includes any existing transverter holes or to drill a hole near the serial number plate to accommodate the jack. In my case, I have the K60XV installed so those holes are taken. I also wanted to keep the area of the drilled hole open to bring out a keying RCA jack at some point. My K2 is configured with the KPA100 and KAT100 in a separate EC2 enclosure, therefore I have the standard QRP top installed in my K2 that has two more open transverter holes. This is where I chose to install my RCA audio output jack.
In the kit, I have provided a 2-pin Molex connector with pins. I suggest using it placed in a convenient location to disconnect the audio output cable for convenient service of the K2. I simply cut my audio cable in half and installed the Molex connector there. It rests about half way down the right side of the K2 and allows me to disconnect it whenever I remove the top cover.
I simply soldered the wires to the Molex pins and hand crimped them with needle nose pliers and they locked right in. Use the male pins on the male housing (the larger half of the connector) and the female pins on the mating housing.
To bring the audio cable out from behind the Control Board, Don has suggested using the lift hole located at the bottom of the Control Board to route the wires. I elected to use a file and provide a little notch on the side of the Control Board near P6 (frequency counter plug). It is mainly ground plane in that area, so I carefully filed a notch big enough to bring the wires through.
Either method of bringing the cable out will make for a nice, clean installation and still provide plenty of flexibility in servicing the K2.
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Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products The following pictures show my final installation:
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Dave Van Wallaghen Servicing Elecraft’s Classic Line of Products
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