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Amp Camp Amp - ACA
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Old 17th February 2017, 11:00 PM   #3171
HemiBooch is offline HemiBooch
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rnjorge: Yes - swapped PSUs and have eliminated many other variables as well, e.g. tried different preamps, different sources, etc.
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Old 17th February 2017, 11:07 PM   #3172
Zen Mod is online now Zen Mod  Serbia
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Quote:
Originally Posted by HemiBooch View Post
DIY friends. Finally had an opportunity to take and post some photos of my wayward 1st attempts at building amps.
So, first, 4 photos of the good one.
Then, 4 photos of the bad one.
The ugly? Well, one look at my soldering...
Thanks for any and all sleuthing to help this rookie DIYer...
I must confess, about ready to throw in the towel
good one is good by sheer luck

bad one is bad most likely because of bad soldering , all over the place

remove pcb from htsnk , inspect and redo ............ everything

if your solder iron is too weak , find more powerful one
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Old 17th February 2017, 11:11 PM   #3173
HemiBooch is offline HemiBooch
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Quote:
Originally Posted by Zen Mod View Post
good one is good by sheer luck

bad one is bad most likely because of bad soldering , all over the place

remove pcb from htsnk , inspect and redo ............ everything

if your solder iron is too weak , find more powerful one
OK - what do I look for to ensure a proper solder iron?
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Old 17th February 2017, 11:42 PM   #3174
Zen Mod is online now Zen Mod  Serbia
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well , plenty of tutorials on ootoobe , much more informative than I could write here

I believe you can find cheap soldering station in power range of 50W and do everything what amateur needs

after decades of using cheapest ones , same as pro range , now I'm having two of these on my bench

I need big bada$$ 60W only for crudest speaker terminals

also - it pays off finding some old pcb (old TV or PC Monitor or whatever , and have some fun desoldering and soldering
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Old 18th February 2017, 12:10 AM   #3175
HemiBooch is offline HemiBooch
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OK - thanks guys. Looks like my soldering needs a lot of practice and a better tool for the job. You are all gracious and helpful, and most appreciated.
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Old 18th February 2017, 03:23 AM   #3176
Variac is offline Variac  Costa Rica
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Seems like you could reheat each joint a bit hotter, maybe you were afraid to overheat stuff. And if the solder doesn't flow then get some flux and paint it on the joint and reheat. Make sure there are no shorts, I see some wire strands close to each other..

My initial trouble shooting routine:

- make sure resistors are correct values- esp. the ones with or without K in the value.
-Make sure caps are inserted with the plus lead in the correct hole
-Make sure the tiny transistors are in the right places.
-reheat each joint until it flows better, sometime feeding in a bit more solder to add flux.
-check no "whiskers " of solder or strands of wire are shorting something out..
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Last edited by Variac; 18th February 2017 at 03:27 AM.
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Old 18th February 2017, 04:45 AM   #3177
koja is offline koja  Canada
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as a suggestion: the ACA kit should offer the DPST version of the same switch so one can optionally implement a relay on the speaker output to reduce the turn off thump. I just did it and I had to break the original switches as I could not pry them out of the front plate. just saying...
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Old 18th February 2017, 04:52 PM   #3178
HemiBooch is offline HemiBooch
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Default Re-soldering in my future...

Quote:
Originally Posted by Variac View Post
Seems like you could reheat each joint a bit hotter, maybe you were afraid to overheat stuff. And if the solder doesn't flow then get some flux and paint it on the joint and reheat. Make sure there are no shorts, I see some wire strands close to each other..

My initial trouble shooting routine:

- make sure resistors are correct values- esp. the ones with or without K in the value.
-Make sure caps are inserted with the plus lead in the correct hole
-Make sure the tiny transistors are in the right places.
-reheat each joint until it flows better, sometime feeding in a bit more solder to add flux.
-check no "whiskers " of solder or strands of wire are shorting something out..
Thanks Variac:
Will re-do everything and hopefully my skills are good enough to now to make this thing sing!
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Old 19th February 2017, 04:25 AM   #3179
kpsthakur is offline kpsthakur  India
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Also please test your MOSFET's...n good luck


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Old 20th February 2017, 03:30 AM   #3180
ZacharyP is offline ZacharyP  United States
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Initially I planned to build a b1 buffer, but I'm not sure if 2vrms is enough to drive both channels of the ACA to clipping. This leads me in search of a low-gain preamp that I can use with my ACA.

Any recommendations or thoughts?
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