Component values R52, 54 and 59

[Rundberg]

Hi!

I have finally gotten around to assemble those Amp4 kits I ordered a year ago

I have just started, but I have already some questions regarding the values for these resistors. R52 and 54 are mentioned as 220K in the BOM, but the closest value I can find in the kit is 200K.

Regarding R59, it is mentioned as 3,3K in the BOM, but there is not such resistor to find in the kit. I have one 2,2K left over though.

I also seem to have four 10K too much, should they be used somewhere?

Thanks a lot for your help!

[elevator]

Rundberg,
I bought my AMP4 2 months ago (there may have been revisions since you bought yours).

-- R52 and R54 are both 200K in the kit -> same as yours. Their use is not critical (voltage dividers) as long as both are the same value.

-- R59 is 3.3K in my BOM but 2.2K in the parts list. The kit itself doesn't have any 3.3K --> presumably an error in the BOM, I used 2.2K. Its use is even less critical (just discharges a bulk cap in the 5V supply).

-- Page 4 of the AI mentions redundant resistors, for input gain selection.

-- Regarding R103,R107,R112,R114 there are discrepancies between BOM, parts list and schematic. This forum may have posts about that.

Good luck.



- Anything can happen. To some degree, anything will happen.

[Rundberg]

Thanks for your help elevator!

Then I will use the 200Ks for R52 and 54 and the 2.2K for the R59.

These are the only 0805s that I have left to populate and I still have the 10Ks left over...

Cheers!