Fired it up... it sounds OK, not good, not particularly bad... but not wonderfull... certainly very strong output... ideal for those with hearing damage or those who would like to have hearing damage...
I will when I get the time again play around with gain, maybe I find a sweetspot... lots of bass, lots of treble... hollow spot in the midrange... and DC offset is also quite high, about 115mV
Otherwise I will recycle the chips into power supplies.
I will when I get the time again play around with gain, maybe I find a sweetspot... lots of bass, lots of treble... hollow spot in the midrange... and DC offset is also quite high, about 115mV
Otherwise I will recycle the chips into power supplies.
Nordic said:
OPA544 directly "upgrade" for TDA2030 (power, THD)
but has a stranger sounds when use as audio amplifier, so its using as amplifier - inadvisable.
this is a best using for this chip (motor driver to) 🙂
For OPA548 you should try tone control .
That's a sad story trying OPA544 or OPA2544 for audio.
However one might be a kind of happy using these as a
headphone driver. When the load resistance is higher the crackles are gone.
On the other hand why to be so hard on trying with these if there is LT1210? It is very well suited for audio when set in unity gain.
Just add a sweet sounding tone control pre and enjoy.
Be a success!
However one might be a kind of happy using these as a
headphone driver. When the load resistance is higher the crackles are gone.
On the other hand why to be so hard on trying with these if there is LT1210? It is very well suited for audio when set in unity gain.
Just add a sweet sounding tone control pre and enjoy.
Be a success!
ybserge said:
there is separate subject for LT1210 on this forum
and link to yooree's site
(for the OPA544 the crackle disappears if amplifier unload on current, having added 2 powerful transistors on output. but sound becomes worse).
Daim blond said:
Yeah, I've been to yooree's site and have e-mailed to him a lot.
And we discussed a lot. The man he is great.
This helped me to be familiar with his works. The first one I tried was Tale3Ultra amp. A nice thing ever! Now thinking about Waft implementation for my future 5 and 1 amp. So good to be heard and to be assisted by someone!
Every success
Yes it does, it can be bridged, but high loads are recommended....
Last year I took the time to test it with a scope at uni....I've left it for a long time; and since I was needing a 6 channel amp I finished it and wanted to know If what every one was saying here was true....sadly it was...beyond 250Hz the chips starts to have a cross over distrotion....quite visible on the scope, but it's not that much audible, I don't recommend it if you are seeking high quality.
It's not all sad story here....the chip delivered 100W onto an 8 ohm load without getting hot like an LM3886 for example at 70W. I recommend it for subwoofer aplications since the signal does not suffer any distortion up to 250Hz and the chip works really cool, and has a really low quiscent current
Last year I took the time to test it with a scope at uni....I've left it for a long time; and since I was needing a 6 channel amp I finished it and wanted to know If what every one was saying here was true....sadly it was...beyond 250Hz the chips starts to have a cross over distrotion....quite visible on the scope, but it's not that much audible, I don't recommend it if you are seeking high quality.
It's not all sad story here....the chip delivered 100W onto an 8 ohm load without getting hot like an LM3886 for example at 70W. I recommend it for subwoofer aplications since the signal does not suffer any distortion up to 250Hz and the chip works really cool, and has a really low quiscent current
At subwoofer frequencies an opamp plus class B output stage with no quiescent current at all and a 2Vbe dead zone can measure quite well
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