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Chip Amps Amplifiers based on integrated circuits

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Old 15th June 2003, 09:36 AM   #11
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by mothman
A beautiful amp indeed and if I had the extra $7000 I'd buy one!
I'd settle for a dozen of the chip insulator pads though at this point.
Anybody know where a fit pad like those can be had?
http://www.schuro.de/

Silicon insulator pad in MultiWatt format. Standard issue but hard to come by.
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Old 15th June 2003, 01:24 PM   #12
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Quote:
Originally posted by mothman
A beautiful amp indeed and if I had the extra $7000 I'd buy one!
I'd settle for a dozen of the chip insulator pads though at this point.
Anybody know where a fit pad like those can be had?

If you run accross them I would love to know where, I've been looking for them too! That said, there is a universal part at Digi-key, part number BER190-ND that looks like it will work.

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Old 15th June 2003, 03:49 PM   #13
mothman is offline mothman  United States
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Thanks Scott and Guys,
For the thermal pad info.Yea it seems somebody stateside should have that 'multiwatt'size.I usually use the LM3886tf but have several of the 3886t I want to use.
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Old 15th June 2003, 03:55 PM   #14
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mothman....I buy sil-pad by the sheet (12x12) and cut out what I want...its a tenth of the price that way....I know there are better insulaters out there...but I dont cut my corners on cooling and good thermal compound works for me


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Old 16th June 2003, 10:23 AM   #15
mothman is offline mothman  United States
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Hey Joe,

Where do you buy your sheets?I'm not opposed to cutting my own at all.
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Old 16th June 2003, 11:23 AM   #16
UrSv is offline UrSv  Sweden
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Most big guys have the sheets but since we are talking the states why does nobody look at for instance Digi-Key? Seems to be a fairly big supplier? They seem to have plenty but i don't know the company very well and not their catalogue either. Try any of the following most obvious potential candidates, all Multi-Watt as it seems, from their on-line catalogue:

BER190-ND
GAPPADHC100020MIL-ND
K4AC-124-ND

Some info :
http://dkc3.digikey.com/PDF/T032/0480.pdf
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Old 16th June 2003, 01:12 PM   #17
Nuuk is offline Nuuk  United Kingdom
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As regards clamping down the chip with something like those metal bars, I presume that the chips do have a breaking point and I wondered if the bars have to be carefully torqued down?

And I can just envisage a thread here about 'the best sounding torque setting'

Personally, I would prefer something springy with a bit of give to be on the safe side!
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Old 16th June 2003, 04:13 PM   #18
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I saw some internal pictures some time ago of the Linn 2250 power amp, on a spanish magazine.
It uses what seams to me as 3 x TDA7294 per channel .
The pictures were not very clear...
I wonder what topology do they use.
3 chips per channel...
3 parallel?
They claim 115w RMS / 8 ohms, 230w RMS / 4 ohms.
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Old 16th June 2003, 04:40 PM   #19
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Quote:
Originally posted by miguel2
The signal goes directly from the jensens to the vol control and then to the output chips? No other gain/buffer ICs in between?

Miguel

The CS3310 is a buffer/gain stage too.
Check here:
http://www.cirrus.com/en/products/pro/detail/P2.html

It says:
"The CS3310 includes an array of well-matched resistors and a low noise active output stage that is capable of driving a 600 W load. A total adjustable range of 127 dB, in 0.5 dB steps, is achieved through 95.5 dB of attenuation and 31.5 dB of gain"
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Old 18th June 2003, 05:58 AM   #20
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The PCB screw is grounded to the chassis? Look closely.

Is this the correct way to ground
the "ground plane" on the pcb ?
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