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Chip Amps Amplifiers based on integrated circuits

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Old 30th January 2013, 01:28 PM   #2351
JMFahey is offline JMFahey  Argentina
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Location: Buenos Aires - Argentina
Does it have a chip amp inside?
Otherwise, I think some loudspeaker cabinet thread might fit better.
Anyway: cool idea
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Old 30th January 2013, 02:38 PM   #2352
child1 is offline child1  Denmark
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It is fitted with a tda2616 chipamp and pga2311 volume ic
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Old 30th January 2013, 02:41 PM   #2353
6L6 is online now 6L6  United States
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Quote:
Originally Posted by child1 View Post
It is fitted with a tda2616 chipamp and pga2311 volume ic
Wonderful project! What is the wood / veneer? Very attractive.

Do you have any photos taken during construction?
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Old 30th January 2013, 02:56 PM   #2354
JMFahey is offline JMFahey  Argentina
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Quote:
It is fitted with a tda2616 chipamp and pga2311 volume ic
Cool !!! , but .... show it
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Old 30th January 2013, 05:52 PM   #2355
child1 is offline child1  Denmark
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Thanks guys... !

@6L6 - the veneer is ebony. Unfortunately i haven't got any photos from the construction. Stupid really, but when i first get going on a project like this, I can't find the time to grab the camera

@JMfahey - I have attached a couple of pictures of the system disassembled...

@all - A short description:

The system is based around the TDA2616 chip amp. The input signal is attenuated/amplified through an PGA2311 volume chip controlled from a Attiny2313 -controller. The remote system is based on the rentron TINY-II set.
The speakers are Wavecor Fullrange + subwoofer (cutoff at 1000Hz) to give that extra punch.

Next project is to add a subwoofer to the system. An active subfilter has been incorporated into the main board of the soundbar..

Thanks for looking!
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Old 30th January 2013, 08:39 PM   #2356
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Very nice. Good use of a microprocessor and infra red control.

How is the PGA2311 to work with? I am using IR to control a motorized volume pot and also as a channel selector on a DAC/Pre amp I've almost finished. I would like to use a PGA2311, what is the sound quality like from these chips and do they change the volume smoothly?
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Old 31st January 2013, 06:17 AM   #2357
child1 is offline child1  Denmark
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@portreathbeach - Thank you I'm pretty happy with it. As always there are some minor details i probably would have done differently now. But overall its a success.

As to the PGA2311 - After some problems with the SPI (on the ATtiny2313) where solved it works beautifully. No noise what so ever, and the volume is in-/decreased smoothly. However a more smooth volume change could probably be obtained by increasing logarithmic (i think the PGA is changed linear??). Other than the fact that you need to have some understanding for SPI, it's easy to work with And again - the sound quality is great in this system. I can not say that it wouldn't be audible on a $100.000 system. But for this relatively low end it is great
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Old 1st February 2013, 06:39 AM   #2358
Piggy is offline Piggy  Hong Kong
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Default Rebuilt my LM3886 chipamp

After using my chipamp for some time, the output relay was producing some distorted sound. So I decided to rebuild my chipamp.
Still using the same home made PCB. The PCU capacitance is 33,000uF per rail with f-3dB set at around 35Hz.
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Old 2nd February 2013, 11:31 PM   #2359
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I know I've already posted a pic of my LM4780 chip amp and power supply, but I couldn't resist posting a couple of pics of my DAC/Pre amp I've just finished coupled with my LM4780 amp:

Click the image to open in full size.

The DAC/Pre amp with IR reciver, motorized pot controlling a Lightspeed Attenuator and channel selector/mute on the left knob using a rotary encoder. All controlled by a PIC16F690 microprocessor.

Click the image to open in full size.

Fits in very nicely with my original PSU and chipamp
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Old 12th February 2013, 01:39 AM   #2360
redjr is offline redjr  United States
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Default My latest integrated amp build

I don't know what drives me to tackle these ambitious projects. Maybe because I can, and enjoy the challenge. Anyway, my latest is an integrated amp with digital-input, based on the Tripath, TA2022 chipamp.

Maybe I take the easy way out, but I prefer modules (from my favorite eBay vendor), over full board builds from the ground up. The amp includes several modules including;

TA2022 amp ~50wpc
NE5532 pre-amp with tone controls
Digital Input and PSU modules
2 Transformers
Speaker Protection module, and
Enclosure

Nothings special about any of the modules, just a modest integrated amp that I wanted to include digital too. I made an expensive boof-up with the front panel, but decided to live with it. I'm the only one who knows! BTW, it was not FPE fault, just my stupid assumption about how the pre-amp controls were layed out. Live and learn. FPE did a great job on the milling and letter of the panels. I did switch out the black knobs for silver after I was done taking pictures.

Anyway, I'm happy with how it turned overall, everything works, and it sounds reasonably well, for what it is, and I'll be using it in my temp housing apt in Danbury, CT while on work assignment.

Here are a few pictures of the progress of my build. Since I wanted to include Pre-Out and Amp-In jacks on the back, note my home-made Johnson plugs in the last picture.

Rick
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Last edited by redjr; 12th February 2013 at 01:43 AM. Reason: Update
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