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Chip Amps Amplifiers based on integrated circuits

LM1875 transconductance amp
LM1875 transconductance amp
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Old 16th September 2017, 10:30 AM   #71
kp93300 is offline kp93300  Malaysia
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Eric
I am interested in your test results
Kp93300
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Old 16th September 2017, 12:01 PM   #72
jwicaksana is offline jwicaksana  Indonesia
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I am tuning in as well.
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Old 18th September 2017, 04:49 AM   #73
e_fortier is offline e_fortier  Canada
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LM1875 transconductance amp
Would this heatsink be ok for stereo ?

Thanks
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Old 18th September 2017, 06:09 AM   #74
padamiecki is offline padamiecki  Poland
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what power supply voltage did you use?
anyway should be ok enough...
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Old 22nd September 2017, 12:01 PM   #75
scott17 is offline scott17
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Hello Eric,

I would be interested in a couple of the boards if possible once you get everything worked out. I've got a couple new National Semiconductor LM1875 that I have had since the 1990s.

I built a stereo amp using them. That amp sounded great and was pretty much bullet proof. Lost in a move some time ago.
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Old 10th November 2017, 03:09 PM   #76
jwicaksana is offline jwicaksana  Indonesia
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Hi Eric, any listening impression yet? Or maybe some Gerbers so we can try ourselves? Thank you very much.
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Old 14th November 2017, 04:20 AM   #77
e_fortier is offline e_fortier  Canada
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LM1875 transconductance amp
Hi guys

The PCB is working but I've got a noisy smps powering the amp. Let me try with a linear supply. I then have to build a sealed enclosure for the full range speakers. Lots on my plate lately. If really interested, I can send some pcb (free), just pay shipping.

Eric
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Old 17th November 2017, 08:49 AM   #78
Lohengrimas is offline Lohengrimas  Netherlands
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Cool stuff, Eric, subscribed for when the PCB's become available. I was thinking of building the "two resistor" minimalist version of the LM1875 but I think this is a much more fun and rewarding project, given my sets of FR speakers.
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Old 17th November 2017, 08:54 AM   #79
padamiecki is offline padamiecki  Poland
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Quote:
Originally Posted by stocktrader200 View Post
I built a discreet current feedback mosfet amp that is unity gain stable for this test.
the results are outstanding
Hi!
please share your schematic and setup.
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Old 3rd June 2018, 06:34 PM   #80
kking85743 is offline kking85743
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Quote:
Originally Posted by e_fortier View Post
Hi guys

The PCB is working but I've got a noisy smps powering the amp. Let me try with a linear supply. I then have to build a sealed enclosure for the full range speakers. Lots on my plate lately. If really interested, I can send some pcb (free), just pay shipping.

Eric
Where do things stand? I'd like to try a simple, straight forward amp like this to see if it worked well with the speakers I have. I think it will, but I'm not sufficiently convinced to do design & breadboard on my own.
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