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Chip Amps Amplifiers based on integrated circuits

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Old 31st January 2005, 04:10 PM   #11
jcx is online now jcx  United States
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yes, repeating a ref to something without stating that it had no new info beyond how to bridge was annoying

but http://www.edn.com/contents/images/45890.pdf might help

"Bootstrapping your op amp yields wide voltage swings" shows how to use transistors to increase V handling
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Old 31st January 2005, 04:32 PM   #12
loong is offline loong  United Kingdom
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I don't know exactly what you looking for.

My friend made a brdiged amp using the DRV134 (as the diff driver) to drive 2 op amps (OPA54x) with very compact PCB, it produces very good result. With direct drive by the NAD521i and our taste, it clearly beats the NAD 320BEE.
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Old 31st January 2005, 08:06 PM   #13
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i think it was something like this: sorry about the schematic i don't have schematic programs installed on this computer. would this work?
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Old 31st January 2005, 08:12 PM   #14
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Quote:
Originally posted by soundNERD
would this work?
As a voicecoil burner, it would be great. As an amplifier, nope. See my last
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Old 31st January 2005, 08:39 PM   #15
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Quote:
Originally posted by richie00boy


As a voicecoil burner, it would be great. As an amplifier, nope. See my last
I think you are assuming that each chip's quiescent output is centered on it's rails and not at GND.
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Old 31st January 2005, 08:51 PM   #16
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Show me a chipamp that can swing right to a rail and I'll give you a dollar
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Old 31st January 2005, 08:55 PM   #17
azira is offline azira  United States
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This kind of what you were thinking soundNERD? I scribbled this down a while ago, still a lot of hurdles to clear before it'd be a usable idea though..

good part is that the chip wouldn't have to swing rail to rail, infact only being able to get within .7V of the rail would be ideal.

edit: I remember now, after posting why I scrapped this idea... diodes still don't isolate the outputs from driving eachother... damn...
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Old 31st January 2005, 09:21 PM   #18
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ouch.....
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Old 31st January 2005, 09:34 PM   #19
HDTVman is offline HDTVman  United States
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Quote:
Originally posted by soundNERD
i think it was something like this: sorry about the schematic i don't have schematic programs installed on this computer. would this work?

Sound heard if this is built.

BANG! Whats that smell?

Source of smell, Speaker, smoke from chip amps, any resistors connected to the circuit, power supply transformer if your not fast or the fuse didn't save you.

This is a bad idea, sorry.

BZ
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Old 31st January 2005, 10:22 PM   #20
azira is offline azira  United States
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Quote:
Originally posted by HDTVman


This is a bad idea, sorry.

BZ
Can you explain what is bad about it. It's not down on paper will all values listed... but is the idea really faulty? Is this circuit also a bad idea, it seems like sort of the same thing to me.
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