This one can be used, I think:
OPA567
Operational Amplifier (Op Amp) - Precision Amplifier - OPA567 - TI.com
OPA567
Operational Amplifier (Op Amp) - Precision Amplifier - OPA567 - TI.com
To build a discrete is very difficult, if you want some 1 Watt output.
It is not impossible, but difficult.
I guess so. Actually I'm limited by the battery, not the watt. I think 0.5W is still loud enough.
Or is it difficult to get an acceptable distortion? From what I have seen using 2 or 3 stage simple transistors, distortion is above 3%. This is too high compared to a chip amp but I don't know soundwise because that is probably second order. Need to try one to know and compare.
How about TDA2822M, bridge config?
Ah, I have plenty of that chip. Yes I will build the bridge version for comparison to get to the best one. Problem was/is there is a difference between the sample schematic and sample PCB, on the feedback arrangement;
and I don't know about bridge amp so I have no idea which one is correct (but I think the schematic is correct). Couldn't find time to ask question about the PDF. Maybe later.
What pcb? All you need is this
Okay I will ignore the sample pcb track from the datasheet
Attachments
TEA2025 , also from STMicro but with better perfs than TDA2822M.
Yes, it was my favorite. I wasn't sure about the battery but now I think it will do. With 7v3 I think I need to zener it at 6v8 or so.
No need for regulation. Just connect it direct.
Hmmm good idea. I was afraid of supply voltage reduction during playback.
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