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Chip Amps Amplifiers based on integrated circuits

LM1875 transconductance amp
LM1875 transconductance amp
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Old 4th June 2018, 08:55 AM   #81
Clueless but avid is offline Clueless but avid  Germany
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I've got some LM1875 for free use to test several circuits and I'm building this one right now >
On the other hand I've got the complete output transistors, even the matched ones still matched, of a Rotel RA-06, and would like to get them to know a LM1875. Maybe there will/ could be love?


greetings
Jochen
Attached Images
File Type: jpg pano Trans-Amp Prasi 02.jpg (841.6 KB, 302 views)
File Type: jpg Transistoren Rotel RA-06 1000w.JPG (645.9 KB, 288 views)

Last edited by Clueless but avid; 4th June 2018 at 09:05 AM.
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Old 22nd June 2018, 08:31 AM   #82
Clueless but avid is offline Clueless but avid  Germany
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Just finished my first LM1875 Transconductance Amp and it sounds great! Just one channel, just one 5" speaker, but it sounds like much more .
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Old 25th June 2018, 05:24 AM   #83
Clueless but avid is offline Clueless but avid  Germany
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Still working on my 2 1/2-way active LM1875 speakers. 1st version with crappy wood and non inverting Amps I gave up for a new version built of MDF with triple Trans-Amp. Work is still in progress but Ihave got some pics:
Attached Images
File Type: jpg 1st contact 800w 01.jpg (163.6 KB, 191 views)
File Type: jpg triple LM1875 Trans-Amp 1000w 01.JPG (951.6 KB, 175 views)
File Type: jpg Box von hinten groß 02.jpg (205.4 KB, 187 views)
File Type: jpg Einbau Elektronik 1000w.jpg (170.6 KB, 65 views)

Last edited by Clueless but avid; 25th June 2018 at 05:28 AM.
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Old 28th June 2018, 12:44 PM   #84
Clueless but avid is offline Clueless but avid  Germany
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It's done and all three are running. Now some testing and then I got to see how I mount it in the box. Maybe a little drawer would be fine.
Attached Images
File Type: jpg triple trans amp läuft 1000w 04.JPG (601.2 KB, 54 views)
File Type: jpg triple trans amp läuft 1000w 02.JPG (656.4 KB, 54 views)
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Old 9th July 2018, 01:41 AM   #85
kking85743 is offline kking85743
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Location: Desert SouthWest, USA
Quote:
Originally Posted by e_fortier View Post
Hi

Revisiting an old thread since I always wanted to try a transconductance amp. since I have full range speakers and the article from NP convinced me to one day give it a try.

Thanks to the good as built schematic of Bimbla and the great help from Prasi a PCB layout has been created. I will try to fire it up very soon and will keep you posted.

I attached some pics of the empty and stuffed PCB (need to find my LM1875

Once tested I'll have some PCB to sell at cost + shipping (cheap)

BR
Eric
I am even later to the party. I am using a pair of full-range speakers with an ACA, but was also intrigued by the TransConductance paper by Nelson Pass.

Do you still have any of the boards to sell? If not I can build one myself, but shipping from China takes foorrreeeevvvvveeeeeerrrrrrr.......

8)
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