http://www.41hz.com/forums/topic.asp?TOPIC_ID=165
Hier heb ik gepost, op 't forum van Jan.
Btw, is hij niet nederlands? Hij begrijpt 't iig nu
Moderator: Beheerdersteam
Dit lijkt me inderdaad de veiligste methode, zeker omdat die chip ws toch niet te redden valt. En zorg voor een scherp pincetje om de resten van de pootjes weg te kunnen pakken. En raak vooral het pcb niet met die dremel.Rudy schreef:Mocht je toch overwegen om de chip te vervangen dan kan je dit best door eerst met behulp van een dremel alle pinnen door te slijpen zo dicht mogelijk ( of zefs tegen tot erin ) bij de chip, zodanig dat je ver genoeg wegblijft van de chip, achteraf dan gewoon pin per pin verwarmen en wegnemen. Klotejob maar wel effektief.
Groetjes
Rudy
Ik vraag Jan of hij mij rev2.0 wil sturen. Dat scheelt me een bult geouwehoer met dat desolderen.Hi,
About a week ago I wrote about a trace missing. The message is below. Please also forward this to your friend in case he did not
get it.
I will send the whole chipset.
Regards
>Hi,
>
>I am embarrased to say that there has been an error
>discovered on the AMP2 boards. So I send
>this to all AMP2 buyers.
>
>There is a trace missing, for the C16 decoupling capacitor.
>While the amp will work at low power it may not at higher.
>
>Solution
>======
>
>Option 1.
>
>Put a wire between C16 and R19. It should be the side of C16 that is
>not tied to the chip, and the side of R19 that is tied to R7.
>
>Option 2.
>
>Request a new board of revision 2 from me, that I would
>send without cost. On a case to case basis I would also
>replace components if needed. Just send a reply to this email,
>indicating what you would need.
>
>The second revision of the board will be available in a
>few weeks.
>
>There are differences between the first and second
>revision, apart from the fix to the problem mentioned above.
>The design has been cleaned up to make it easier to build and
>some minor improvements and minor problem fixes have
>been made. Some features, used by very few, like double
>output MOSFETs have been removed to make the board
>less crowded, and allow wider high power traces. Most
>experimental solutions /jumpers available on version one have
>been removed, in favor of the "recomended" / default connections.
>
>If you need a high power version, I will be stocking
>50 amp MOSFETs (the standard mosfets are 34 amp)
>that can be used instead of the dual MOSFET possibility
>of revision 1.
>
>The missing trace was there on the prototype board, but for
>some reason not on the first production series. That is
>why it was not discovered until one customer pointed it out.
>
>I give my sincere apologies for the time you may have spent on
>this and the troubles it may have caused.
>
>Regards