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Old 3rd August 2003, 07:55 AM   #1
ben goh is offline ben goh  Singapore
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Default fm acoustics

Hi there,

Has anybody any infor on FM Acoustics amplifiers or pre.

Very interested in their technologies. Schematic will be even

better.

Greatly appreciated.
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Old 28th October 2009, 05:45 PM   #2
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regarded this brand I have start this thread:
FM Acoustics FM 1000 Ultra-High Power Amplifier, the absolute State of the Art?
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Old 28th October 2009, 07:27 PM   #3
Nrik is offline Nrik  Denmark
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If you read through their website, you will see that they do extensive matching, measuring testing to their equipment before they are sold.
Besides they make their own transistors(!), and I especially like their look upon powersupplies - uF is not important, series resistance is!

I guess you can call it like a swiss clock manufacturer.
A schemaitc will give you an idea of the topology, but many of the above mentioned details are the reason for the high price, and rightly so.

I once did some reverse engineering from some pictures - it might have errors, but check it out:
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File Type: png FM115 input stage.png (132.5 KB, 1016 views)
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Old 28th October 2009, 07:28 PM   #4
Nrik is offline Nrik  Denmark
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output
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Old 30th November 2011, 07:24 PM   #5
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Can anyone identify this heatsink, model and manufacturer?
The T-profiles are mounted in a slot in the heatsink.
Thanks
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File Type: jpg FM1811 heatsink.JPG (79.5 KB, 699 views)
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Old 30th November 2011, 09:45 PM   #6
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Quote:
Originally Posted by Nrik View Post
If you read through their website, you will see that they do extensive matching, measuring testing to their equipment before they are sold.
Besides they make their own transistors(!), and I especially like their look upon powersupplies - uF is not important, series resistance is!

I guess you can call it like a swiss clock manufacturer.
A schemaitc will give you an idea of the topology, but many of the above mentioned details are the reason for the high price, and rightly so.

I once did some reverse engineering from some pictures - it might have errors, but check it out:
unbelievably unlikely that they own a silicon foundry... almost zip.

_-_-bear
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Old 1st December 2011, 05:34 PM   #7
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Quote:
Originally Posted by tommy1000 View Post
Can anyone identify this heatsink, model and manufacturer?
The T-profiles are mounted in a slot in the heatsink.
Thanks
ask there:
Home - Fischerelektronik
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Old 2nd December 2011, 11:39 AM   #8
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Thank you tiefbassuebertr
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Old 4th December 2011, 03:43 PM   #9
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I have been looking at this design. FM acoustics uses two unusual diodes in the ccs. The color rings are orange, brown and yellow = 314 = 1N314. This is an gold diffusion germanium diode made by BKC International. What is the purpose of using this diode?

The other diodes are 1N4148 used in an other position.
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Old 4th December 2011, 04:10 PM   #10
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by bear View Post
unbelievably unlikely that they own a silicon foundry... almost zip.

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At those pricese Huber could ....
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