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Chip Amps Amplifiers based on integrated circuits

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Old 8th August 2012, 09:09 PM   #31
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Hey there. My parts arrives in the mail ten minutes ago. I'm ready to build this. I actually ordered enough parts to make two of these since everything was so cheap.
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Old 8th August 2012, 09:25 PM   #32
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whoooha good news.

I usualy mount the IC on a heatsink first, then solder stuff.
Thisway it can dissipate heat, i won't fry the poor thing so easyli.
Other than that the heatsink adds mass, and allows easy handling/holding at a fixed position.

Did You manage to get heatsinks ?
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Old 8th August 2012, 10:25 PM   #33
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yeah, I got some bigger ones like they had in the youtube videos I saw. about the size of a deck of playing cards with vents on it.

anyway I can play with this on a bread board before I start soldering? I've only soldered speakers before and this thing looks a little harder to solder, lol.
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Old 9th August 2012, 05:26 AM   #34
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all the parts fit on the bread board just fine. I tried to wire it up according to your schematic, but I got no sound. I'm sure I have the C5 and C6 wired up wrong. the first part is a little confusing to me. I have the power running to the positive and negative rails on the side of the breadboard.

the schematics make it seem to me that C5 is on that rail with the positive lead on the positive rail and the negative lead on the negative rail. same with C6 it looks like it's down stream of C5 and connected to both the positive and the negative rail.

I also have everything that says ground hooked up to the negative rail. is that right?
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Old 9th August 2012, 01:01 PM   #35
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a picture would help more.
actualy on a breadboard it may be harder to do then without any board.
Later today i will have time to do a step-by-step soldering guide for the components.
Then it will be easy to solder it up and get it to run.
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Old 10th August 2012, 02:47 AM   #36
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attached is the best "picture" I can give you, lol, sorry.

everything else is clear and makes sense. it's just C5 and C6 that confuse me.

attached is a picture of how I had them on the bread board. I basically circled the location and holes they were plugged into....
Attached Images
File Type: jpg Breadboard (1).jpg (149.3 KB, 60 views)
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Old 10th August 2012, 07:34 AM   #37
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If they are for decoupling supply rail, then yes.
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Old 13th August 2012, 05:01 PM   #38
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yeah, that's what it's for.

I hope i havent ruined this IC by hooking it up wrong. I didn't see any blue smoke.
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Old 26th August 2012, 05:02 PM   #39
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I did it. I got it working last night! I was pretty excited about it.

the first two capacitors were confusing me but I figured it out. I searched the forum for other posts on the 1557Q and found some helpfull things. maybe the other IC was bad, or maybe the way I had the IC grounded was wrong, either way it works. thanks so much for your help arty.

could I use two of these little amps on the same battery? can I bridge the left and right channels of each one?

also, I found a tone control circuit on 41hz.com and I'm going to try that next.
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Old 26th August 2012, 09:42 PM   #40
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o my god, i forgot to post the assembly guide ...
Darn, sorry mate, i wish i would not had forgot it..

I feal so.. ashamed of my self..

on the otherhand, congrats on Your first amplifier
Sadly it can not be beridged, as it is allready bridged.
The chip has 4 amps inside total.
2x2 bridged.
You could use 2 of them from the same battery, but it may make it go hot if You drive them hard.
Actualy this amp takes only a bit of patience to set up working.

Basicly if i was You i would add a volume pot. It would make it a lot better, if volume could be adjusted, i would say.

The next big task would be making a proper powersupply for this amplifier.
And afterwards a proper switch on circuitry, to avoid "plop" sound when You turn it on.

The tone controlls would be the last thing, by that time You will be able to make a decent one.


Anyways i em verry happy You managed it, and reported back.
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