I noticed this circuit of lm3886 not long ago. Here, the function of the 3886 is to buffer. All voltage amplification is responsible by the previous lm318. It is said that this circuit can achieve very low THD. I want to know the detailed operation principle of this circuit,
Now I can't buy 3886 chips. Can I use lm4766 tda7293 lm1875? Can the lm318 be replaced by opa1612, a modern low distortion amplifier? Can you recommend a circuit that can work normally? I don't want to use the recommended circuit in the manual, because I've done it. The timbre is too ordinary.
Now I can't buy 3886 chips. Can I use lm4766 tda7293 lm1875? Can the lm318 be replaced by opa1612, a modern low distortion amplifier? Can you recommend a circuit that can work normally? I don't want to use the recommended circuit in the manual, because I've done it. The timbre is too ordinary.
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a quick search finds this.
https://www.diyaudio.com/community/...iers-based-on-tda7293-94.379506/#post-6850255
there are many others as well here on this great diyaudio web site
https://www.diyaudio.com/community/...iers-based-on-tda7293-94.379506/#post-6850255
there are many others as well here on this great diyaudio web site
This is not really the case. It is a composite amplifier, where the lm318 acts as correcting element. Just look for "composite amp" on diyaudio.
It is very strange circuit here.Unesesary complicated. lm3886 works as howland current pump(current drive). But then lm318 makes all circuit back to valtage drive amplifier. So overall it is composite voltage amp. lm318 should improve performance of lm3886.
Then there is another problem in your setup.
You want flatter than ruler flat?
That´s an oxymoron.
Or maybe you want an effects box, not an amplifier?
You can't just substitute the power chip with another one and expect the circuit to work properly.
OPA1612 is a great op amp but the circuit needs to be properly compensated.
