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Chip Amps Amplifiers based on integrated circuits

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Old 13th November 2003, 05:32 AM   #11
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Default Re: Re: Re: Discussions on Balenced Amplifers

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Originally posted by Brett
A much better idea than most of the others presented.
Thanks. It's worked for me for quite a few years. Though it can be considerably more expensive than some of the others presented.

se
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Old 13th November 2003, 06:26 AM   #12
dhaen is offline dhaen  Europe
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Default Ssm2142 / Ina134

Transformers are best, but....
The best non-transformer, non valve solution:
http://www.analog.com/Analog_Root/pr...SM2143,00.html
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Old 13th November 2003, 06:31 AM   #13
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Quote:
Originally posted by Mad_K



This is one of the pages I read when making my bal. gainclone

I can't understand what all the fuzz is about. min. 45dB CMRR, and 0,00078dB signal imbalance (10 ohm SE output Z from source). Who needs higher performance than this for audio?

well, the circuit isn't balenced. while it is capable of canceling equal noise on both inputs, it is not capable of picking up the same noise on both inputs. if it were balenced, i would not be able to pick up all that hum on my crossover (which uses the circiut with less gain as an input buffer). i can pick up hum by moving the cables near a transformer.
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Old 13th November 2003, 06:31 AM   #14
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Default Re: Ssm2142 / Ina134

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Originally posted by Steve Eddy


Thanks. It's worked for me for quite a few years. Though it can be considerably more expensive than some of the others presented.

se
You're welcome. The initial cost is an issue, but there's all the advantages the Tx's have, and providing you don't toast them, will hold their value well for later resale.

Quote:
Originally posted by dhaen
Transformers are best, but....
The best non-transformer, non valve solution:
http://www.analog.com/Analog_Root/pr...SM2143,00.html
Well John, the 2142's had better have improves a lot since I last used them, because they sounded dire.
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Old 13th November 2003, 06:51 AM   #15
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Default Re: Re: Ssm2142 / Ina134

Quote:
Originally posted by Brett
You're welcome. The initial cost is an issue, but there's all the advantages the Tx's have, and providing you don't toast them, will hold their value well for later resale.
Perhaps in the pro audio market. With the exception of transformer-based attenuators and MC step-ups, transformers are almost unheard of in high-end home audio.

se
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Old 13th November 2003, 07:00 AM   #16
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Quote:
Originally posted by Steve Eddy


Perhaps in the pro audio market.
Absolutely, but if you bought some of the Jensens and decided to sell them later, they would sell readily on ebay.

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With the exception of transformer-based attenuators and MC step-ups, transformers are almost unheard of in high-end home audio.
That's their misfortune then isn't it?
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Old 13th November 2003, 07:36 AM   #17
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Quote:
Originally posted by Brett
Absolutely, but if you bought some of the Jensens and decided to sell them later, they would sell readily on ebay.
Let's watch:

http://cgi.ebay.com/ws/eBayISAPI.dll...&category=4665



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That's their misfortune then isn't it?
Hehehe. Naaaaaaah. Hey, if they're happy, I'm no one to argue.

se
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Old 13th November 2003, 04:45 PM   #18
Mad_K is offline Mad_K  Norway
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yep, a basic difference amp... very informative datasheet also

edit: was supposed to quote dhaen...
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Old 3rd January 2004, 04:07 PM   #19
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The only input transformers that are mentioned in these forums seem to be ones specially designed for music (pro-fi, or hi-fi) use, and are thus fairly expensive.

Has anyone thought of using cheaper alternatives like those made by Tamura or Hammond? The following transformers from Tamura look interesting, but what do you guys think of them? Can anyone suggest a good circuit using one of these transformers for making a bridged amplifier?

On page 3:
http://dkc3.digikey.com/pdf/C041/1160-1165.pdf
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File Type: jpg tamura_isoxformers.jpg (82.8 KB, 286 views)
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Old 3rd January 2004, 06:25 PM   #20
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Quote:
Originally posted by Mad_K
yep, a basic difference amp... very informative datasheet also

edit: was supposed to quote dhaen...
just out of curiosity, how is that IC balenced. i agree that it is a difference amplifer, but i don't agree that it has equal input impedances. as i understand it, the idea is to have equal impeances to pick up equal noise then use a difference amplifer to cancel it out.

no one has been able to show me that this circuit is balenced with any input signal. it is balenced without a signal though, so i guess during silence - when noise could be heard - the noise rejection increases.
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