Help with battery powered amplifier choices

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Your suggestions for modern monolithic devices will not result in noticeably improved performance, they are the same kind of overoptimistic, unrealistic, fantastical approach that calls 200-4000Hz hi-fi, and leads ultimately to the purchase of silver wire mains cables.

Whose kidding who
My suggestions for using modern low cost op amps as audio building blocks will allow the OP to build something that can be fabbed easily without spending all his time chasing , cross referencing parts and ultimately trying to get it working. I have enough experience to know to the path you are showing him is a rocky road. Those discrete audio amps w/o any performance gains is a silly choice here. Try to present those designs as audio solutions anywhere else and you'll be the joke.
The OP would be better spending his time tuning the front end, and modding filters. LOL
 
Experience, right, your licence dates from when? Mine is in the UK M series.

I already took the time to establish that the parts are readily available from suppliers in the US.

If you knew anything about receiver design you would know why the discrete design does offer a true performance gain, in the context of DC.. I showed it only for completeness, to satisfy the request of the OP for low noise and high gain.

If you look at published designs of high performance DC receivers you will see that almost without exception the first stage after the mixer will be discrete. This is the easiest way of ensuring low noise and an impedance match.

As regards my own experience, here's a screenshot of a 2-metre packet transceiver card for IBM PC ISA bus I designed in the 90's. That's the ISA bus in the top left corner...

packet.jpg

...'course you can't make out much at that resolution, so here's the heart of the beast, a dual-conversion superhet, FM modulator, front end filtration and signal switching. There's a pll LO and modem lurking around in there too. I won't bore you with screenshots of the C++ Windows software I wrote for it.

dual_conv.jpg

A while after that I learned to write VHDL while working on a 3G phone base station radio card so my interest shifted to SDR. Not much in the way of hardware to show there, it all goes in the prog logic.

We have an engineering expression for the kind of 'improvements' represented by bolting on a low noise 'high fidelity' back end to a receiver with a 5k bandwidth and 86 dB of single-stage front end gain.

T*ts on a bull.

w

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So let me see if I understand your logic, you are saying that using easy to implement low cost op amps and pwr amp chips is not the way to go because they are too high in performance for the task at hand, and yet you offer up old discrete solutions because they could offer higher performance than monolythic chips.
 
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So let me see if I understand your logic, you are saying that using easy to implement low cost op amps and pwr amp chips is not the way to go because they are too high in performance for the task at hand, and yet you offer up old discrete solutions because they could offer higher performance than monolythic chips.

No, I would never say monolythic. It's monolithic.

Go find somebody else to pick an argument with, infinia.

w
 
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