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Chip Amps Amplifiers based on integrated circuits

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Old 18th March 2013, 09:27 AM   #2381
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Default LM1875 AMP

This is my LM1875 AMP getting readey.
It has a +-22V LM338 regulated supply with 100VA trafo and 3x3300uF/side cap. Circuit is mostly the default for amp and regulator also.
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Old 18th March 2013, 10:02 AM   #2382
karma is offline karma  Canada
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Location: hamilton,ontario
nice
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Old 21st March 2013, 12:32 PM   #2383
ippo is offline ippo  Sweden
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Default LM3886 stereo-kit

Have built my LM3886-kit bought from BrianGT (Chipamp.com) but haven't finished as visible... Top lid and front is still to be made.

I like the sound alot together with my diy Nomex164 designed by Troels Gravesen.
Will post pic when all is finished...


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Old 4th April 2013, 12:35 PM   #2384
bemoth is offline bemoth  Sweden
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Join Date: Nov 2006
Location: Norrfjärden
My first build. Lm3875 kit from audiosector built into monoblocks, wont post internal pics because its not very beautiful

My budget rig:
Yaqin MS-12B -> GC monoblocks -> Dali suite 2.5

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Skickat från min XT910 via Tapatalk 2
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Old 5th April 2013, 08:23 PM   #2385
frank1 is offline frank1  United Kingdom
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Quote:
Originally Posted by bemoth View Post
My first build. Lm3875 kit from audiosector built into monoblocks, wont post internal pics because its not very beautiful
+10 points for putting the heatsink on the outside.
Frank
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Old 7th April 2013, 10:50 AM   #2386
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I was inspired to build my own amp when I read about the Synergy LM3875 chip amp. This is my first major build.

It uses point-to-point construction with 2 LM3886TF chips.

I initially got the heatsinks that you see on the inside of the case, but those proved to be insufficient, so I bought a bigger one, but decided to use both, and cut the side of the case cover so I can put the big one on the outside. Essentially the entire aluminium case works to transfer heat, so even after hours the amp only becomes warm.
I wanted to get it very compact, it's about 25cm wide (with heat sink) and 5cm high, but the toroid transformer makes it quite heavy.

It has no noise, only a very faint white noise at full volume that you can only hear if you put your ear to the speaker and nothing is playing. The star-ground eliminated the majority of noises, and the rectifier snubbing capacitors took out the rest. I also put snubbing on the puffer capacitors but those didn't make an audible difference.

I'm very happy with it, the sound quality is excellent, everyone who heard it wants to replace their own amps now.
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Old 12th April 2013, 09:18 PM   #2387
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Talking wooden lm3886 stereo

huge heatsink with fan regulated via 1k thermistor (thermistor ordered, 1k resistor now in place),+-38v 20 000uf rail , huge old school trafo ,measured output voltage of 19.2v on 4 ohm speaker for few seconds on one chip ...desinged for paralell application for 4 ohm subwoofer but i think i will use it for my normal stereo speakers
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Last edited by tonitonitoni; 12th April 2013 at 09:32 PM. Reason: thumbs
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Old 17th April 2013, 06:58 PM   #2388
pyleck is offline pyleck  Canada
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Default MHHA-V4.0 and MKII Tripath TA2023

Hello,
I'm new to this forum and here's my first try ...
Got from ebay and put whole things together under the same hood. Electronics exactly as is, no mods nothing changed to the circuits at all. No noises even at 3/4 max volume, Sounds good to me !
Attached Images
File Type: jpg amp_0a.jpg (161.8 KB, 277 views)
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File Type: jpg amp_5.jpg (36.9 KB, 180 views)
File Type: jpg amp_6.jpg (82.3 KB, 215 views)
File Type: jpg amp_7.jpg (90.1 KB, 223 views)
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Old 17th April 2013, 07:28 PM   #2389
benb is offline benb  United States
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Hold on! What's that funny thing plugged into that white round socket???
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Old 17th April 2013, 07:50 PM   #2390
6L6 is offline 6L6  United States
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It's a high-voltage, empty-state, boiling-electron, variable-flow, thermonic widget of some kind.

I think...
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