ACA illustrated build guide

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#41
Hi Jim, fantastic build guide as usual... just a question about the extra resistor... I built one of the original kits and had no problem biasing the amps. Why is this mod required? Parts substitution from original kit?
 
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#44
a little hum

i have finished my ACA, when test single ch, all is fine, but combined 2ch it will produce a little hum.

my setup is
one tx 18-0 6.5A to
2x crc for 2ch (brigde+10000u+0.1r/5w+10000u)
now is naked test.
i have added a fan (drived by 7v to help heat sink, due to my heatsink not big enough).

any advice, thanks.
 
#46
a little hum

Sorry, I'm in busy.
Here is pictures.

The fan is between two heat sink (tunnel inside).
 

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#55
Received my kit yesterday. Packaging from hifi2000 for the cases was excellent, for the parts/passive components not so much. All the parts including the IRFP240's were just floating around in a ziplock bag, a lot of bent leads on various components. The IRFP240's are supposed to be sent in a protective anti-static mylar bag which was not the case. Hopefully they are not damaged.

Also, the supplied DC-in jack does not fit the case, the hole on the back panel will need to be enlarged slightly. I used a round hand file to do so, but a dremel with a round grinding bit would work better. Make sure you have these tools on hand to avoid the disappointment of not being able to complete and fire it up immediately.
 
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#56
audioexplorations said:
Received my kit yesterday. Packaging from hifi2000 for the cases was excellent, for the parts/passive components not so much. All the parts including the IRFP240's were just floating around in a ziplock bag, a lot of bent leads on various components. The IRFP240's are supposed to be sent in a protective anti-static mylar bag which was not the case. Hopefully they are not damaged.

Also, the supplied DC-in jack does not fit the case, the hole on the back panel will need to be enlarged slightly. I used a round hand file to do so, but a dremel with a round grinding bit would work better. Make sure you have these tools on hand to avoid the disappointment of not being able to complete and fire it up immediately.
Click to expand...

Get to work.
 
#59
audioexplorations said:
Received my kit yesterday. Packaging from hifi2000 for the cases was excellent, for the parts/passive components not so much. All the parts including the IRFP240's were just floating around in a ziplock bag, a lot of bent leads on various components. The IRFP240's are supposed to be sent in a protective anti-static mylar bag which was not the case. Hopefully they are not damaged.

Also, the supplied DC-in jack does not fit the case, the hole on the back panel will need to be enlarged slightly. I used a round hand file to do so, but a dremel with a round grinding bit would work better. Make sure you have these tools on hand to avoid the disappointment of not being able to complete and fire it up immediately.
Click to expand...

I'm glad I wasn't the only one with this issue. I don't feel so silly about not being able to fit a jack now.
 
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