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Chip Amps Amplifiers based on integrated circuits

eBay mono LM1875 kit
eBay mono LM1875 kit
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Old 26th August 2019, 06:13 PM   #51
Bare is offline Bare  Canada
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Join Date: Dec 2001
Location: vancouver
Quote:
Originally Posted by blackdod View Post
Really what I needed was pcb .. the rest, came as a gift
Simply fish the PCB out of it's teeny ziplock.. then deposit the baggie and bits into the trash.
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Old 26th August 2019, 06:35 PM   #52
blackdod is offline blackdod  Europe
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Well, I have been more pragmatic. I bought 4 pcb's of which Im using two as a test bench while saving the other two for the final configuration.

I don't mind using these cheap components to try different things and at the same time I like to see what effect the cheap components have for changing more expensive ones.

I have never had a very clear idea of how to use this amplifier as a headphone amp so I am simply dedicating to do test.
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Old 27th August 2019, 04:43 PM   #53
Bare is offline Bare  Canada
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IF? you are ultimately after a.. Good.. headphone amp.
This will meet/exceed your expectations nicely.
"WHAMMY" Pass DIY headphone amp guide
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Old 27th August 2019, 06:15 PM   #54
blackdod is offline blackdod  Europe
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Quote:
Originally Posted by Bare View Post
IF? you are ultimately after a.. Good.. headphone amp.
This will meet/exceed your expectations nicely.
"WHAMMY" Pass DIY headphone amp guide
Well I'm pretty curious and I like to collect headphone amplifiers back to 2016... Pictures of your diy Pass amplifier

Yes, Whammy is a nice amp but I'm always looking for exotic things to add to my collection.
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Old 28th August 2019, 08:34 PM   #55
Bare is offline Bare  Canada
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V nice clean build.
Don't fully understand Why you are fiddling about with these then? Definitely smaller than a full amp, less shelf space required.
Would be V surprised if an lm1875 cobble up, matched performances to your photo'd build.
My Lm3886 adventures were simply outclassed by My Firstwatt builds.
Better bass, mids and highs , a room deep soundstage was the real eyeopener tho.
Nelson pens a Fine circuit indeed.

If boredom is the impetus .. Perhaps a Lady friend ?
Although those can be exotic and certainly Expensive adventures

Last edited by Bare; 28th August 2019 at 08:42 PM.
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Old 28th August 2019, 09:13 PM   #56
blackdod is offline blackdod  Europe
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DIY is more cheaper and less complicated.

Returning to LM1845, I am not looking for something better than Papa and Wayne's projects, simply I like play and learn.

I tested a channel with an original LM1875 and indeed, the chip supplied in the kit is a TDA.

The LM1875 is brighter, less warm. I would not rate it as better only different but I need some more time to form an opinion.
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Old 29th August 2019, 02:23 AM   #57
Bare is offline Bare  Canada
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Hmm... the 1875 'chips' included in MY 2$ amp kits are Definitely Fakes.. Not even passable copies..
Simple visual comparison alone..between these and Genuine (from Mouser) 1875's Left me with zero doubts.
No subtleties involved there.

I recently received a 'Genuine' 5532 chip to replace the 5532 I bought to erm .. replace.. the suspect one included in a 10$ 7377 2.1 amp kit.
I bought the first replacement at the local Chinese run Ebay junk electronics reseller shop. His 5532 looked credible and of course he swore that it was a Genuine part
Swapped in the Real one.... the audible difference was immediate.

Caveat Emptor
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Old 29th August 2019, 05:43 AM   #58
chermann is offline chermann  Austria
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hi specialists

Is it possible to look at some scope pics of your original kit and an" approved" kit? i am thinking about ringing or less performance etc...

my kit is original but actually my business weeks are still to much to have power to go ahead with DIY

chris
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Old 29th August 2019, 07:10 PM   #59
chermann is offline chermann  Austria
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Default planning.....the housing

Hi


i just play around with the possibilities of a housing (i used this for my TPA3255 "fake amp") and the internal boards.
https://www.amazon.de/dp/B017VIIDN4/...960c5c1d695_CT


pic1 160VA with its dimensions (i bought a 300V for a other project) + big rectifier board + both channels - here is the room for the amp boards limited and t1 board is near to the transformer - not good

pic2 the same but with small psu board (rectifier and caps - no crc..) - here its better for short input signal ways.
oh...yes the transformer should be placed in the middle
pic 3 is just the size of the heat sink = 6cm and the height of the board with possible stands and the lm1875.
pic 4 is the front panel -i like this kind of housing


chris
Attached Images
File Type: jpg 160VA_big rectifier board.jpg (152.8 KB, 140 views)
File Type: jpg 160VA_small rectifier board.jpg (141.6 KB, 145 views)
File Type: jpg LM1875 and heat sink size.jpg (185.9 KB, 146 views)
File Type: jpg front panel heat sink.jpg (99.4 KB, 143 views)

Last edited by chermann; 29th August 2019 at 07:13 PM.
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Old 30th August 2019, 01:01 PM   #60
rabbitz is offline rabbitz  Australia
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Pic 2 is the better layout.
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If there are no dogs in Heaven, then when I die I want to go where they went - Will Rogers
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