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Chip Amps Amplifiers based on integrated circuits

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Old 29th December 2009, 10:55 AM   #1301
AndrewT is offline AndrewT  Scotland
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why do you want to parallel a pair of 8ohm drivers to give a 4ohm load and then give yourself the difficulty of designing a current limited chipamp that can adequately drive that low impedance load?

Use two amplifiers, each designed to drive an 8ohm load and dedicate one amp to one driver.

Fit each driver to it's own separate volume inside your box (sealed or vented) and if one driver or amp goes faulty you can still reproduce live music, just not as loud.
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Old 29th December 2009, 11:28 AM   #1302
Pato666 is offline Pato666  Argentina
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Thanks AndrewT for helping me how to plan this amp. You have a good idea , in the case of two bridged amp, i think i'll have to move to LM3886 chipamp. Thanks a lot guys.
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Old 30th December 2009, 04:51 PM   #1303
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Default my first LM3886

Hi to everybody...

Here is my first LM3886 Chip Amp using PCBs Kit from: eBay Store - HiLife-store: DIY-Audio

Most part are recycled except for the input/output connectors,
The chassis was built in the steel plate of the 360 x 280 mm
The cover is from an old Video Cassette VHS Player
The power switch and AC Socket is from a died PC AXT power supply
The split/dual pot volume control & knob was the a cassette deck.
The power supply is a transformator 2x20V 5A.
The front plate is made a piece 5mm thick of aluminium and black anodize finish
I really had fun with the amp. The sound is clean and fast
Thank you to the diyAudio community for providing me information to build this project,
Happy new year everyone

Sorry, my english is not so good
Attached Images
File Type: jpg Front.JPG (95.6 KB, 2130 views)
File Type: jpg side front.JPG (81.6 KB, 2065 views)
File Type: jpg rear.JPG (112.6 KB, 2006 views)
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Old 30th December 2009, 04:53 PM   #1304
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File Type: jpg inside.JPG (115.6 KB, 2031 views)
File Type: jpg from rear inside.JPG (106.2 KB, 1996 views)
File Type: jpg over front.JPG (92.3 KB, 663 views)
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Old 30th December 2009, 05:23 PM   #1305
Puffin is offline Puffin  United Kingdom
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Quote:
Originally Posted by danmartin View Post
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Sounds bad then ?
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Old 30th December 2009, 07:17 PM   #1306
wim is offline wim  Netherlands
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Default my last little job

Nice work Danmartin.....

My last little job: Peter Daniel boards with LM3875TF.

Power supply 2 x 120 VA. In plastic box, not interesting to show.

Sounds great.

The little VU-meters (with backgroundlight) are used becouse i had them laying around and they are nice to see, but they are no big deal.
Attached Images
File Type: jpg amp 001.JPG (856.0 KB, 1137 views)
File Type: jpg amp 006.JPG (693.7 KB, 1051 views)
File Type: jpg amp 005.JPG (642.3 KB, 633 views)
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Old 30th December 2009, 07:59 PM   #1307
Pato666 is offline Pato666  Argentina
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Very good danmartin! Muy bueno!
Thanks for sharing your work.
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Old 31st December 2009, 02:40 AM   #1308
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Default More juice to it!

Hello I just add more juice to my integrated chip-amp.I had two "extra" Mundorf caps. so Now it has 20000uf per channel.The sound is wonderful.
Attached Images
File Type: jpg IMG_2667.jpg (490.9 KB, 664 views)
File Type: jpg IMG_2669.jpg (493.8 KB, 459 views)
File Type: jpg IMG_2670.JPG (959.9 KB, 342 views)
File Type: jpg IMG_2676.jpg (558.9 KB, 438 views)
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Old 31st December 2009, 02:42 AM   #1309
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More pictures.
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File Type: jpg IMG_2678.jpg (552.8 KB, 548 views)
File Type: jpg IMG_2679.JPG (857.0 KB, 528 views)
File Type: jpg IMG_2682.jpg (361.0 KB, 561 views)
File Type: jpg IMG_2683.jpg (355.9 KB, 427 views)
File Type: jpg IMG_2687.JPG (888.8 KB, 319 views)
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Old 31st December 2009, 02:51 AM   #1310
Pato666 is offline Pato666  Argentina
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nice knobs!
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