Take a look at the K3 mods section, guys. The DSP board add-on AF LPF piggyback board is now available as
K3DSPLPF, K3 DSP LPF Board $24.95 Just two tracks to cut and six through-board connections to be made. No problem at all for anyone who can figure out which end of a soldering iron is the hot end HI! For the overseas purchasers, the cheapest shipping appears to be $40, but put a note in the comments section asking Elecraft to send by cheapest means, like First Class Mail. It's not insured, but my friends and I have never had anything go astray (yet HI! ) Adding the W9AC mods to create a lower bass rolloff frequency will make your DSP board equal to Rev D, although Elecraft's own component changes to achieve a similar result are different. Please note, on the W9AC mod page, here: http://www.n1eu.com/K3/k3audiomod.htm all the parts can be obtained from Mouser. 4.7uF SMT 0603 ceramic cap part number is 80-C0603C475K9P (4 required) 0.47uF SMT 0603 ceramic cap part number is 80-C0603C474K9P (2 required) 1.0uF SMT 0603 ceramic cap part number is 80-C0603C105K9P (1 required) The 100uF capacitors, C9 and C13 in the headphone circuit are SMT 5mm diameter low impedance, part number 647-UCD0J101MCL1GS and are 6.3V components, not 10V as W9AC states. (2 required) Note, Elecraft themselves use 6.3V capacitors in the factory mod. 100uF/10v 5mm diameter capacitors are not commonly available, although Mouser do stock an audio grade 100uF/10v tantalum SMT capacitor that fits the board very nicely. The tantalums are Mouser part number 647-F951A107MBAAM1Q2, but are more expensive than the alternative aluminium electrolytic cap. Note, working with 0603 size SMT components is not a task to be undertaken lightly. Considerable skill is needed to remove existing components and substitute the replacement values. If you are in ANY DOUBT as to your ability to make these changes, consider whether you need the mod at all and if you do, go for the DSP board exchange option, K3DSPUPGD, that Elecraft offers. Happy New Year, everyone. 73 DaveL G3TJP ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
