Hey guys, i forgot to mention, i found something i was looking for 🙂
For a long time i was ignorant of PassLab and his First Watt designs (didnt know that existed in the first place 😀 ) which is exactly what i was looking for SE class A mosfet design.
My choice went to this
Babelfish M25 R.2/SET amp
Huge plus is, Zen is my countryman so getting parts from him is as easy as it gets, i would still need to buy larger parts, which shouldnt be that big of a deal.
Still haven't ordered anything, but i plan on it, at least to have something to do over winter 😉
For a long time i was ignorant of PassLab and his First Watt designs (didnt know that existed in the first place 😀 ) which is exactly what i was looking for SE class A mosfet design.
My choice went to this
Babelfish M25 R.2/SET amp
Huge plus is, Zen is my countryman so getting parts from him is as easy as it gets, i would still need to buy larger parts, which shouldnt be that big of a deal.
Still haven't ordered anything, but i plan on it, at least to have something to do over winter 😉
Yes, it will. One of the complementary output devices is disabled in this connection. It's still there, only never turns on. The same thing happens to opamp outputs when sufficiently current loaded.
lm3886 is designed as classAB for almost 68watts to 4 ohm load, little less to 8 ohm
in order to squeeze ~20 watts classA out of it, it would have to conduct more than amp all the time
it was never meant to, it would overheat and shut down, or burn eventually
i have no idea why thread starter requested that he wants to do it this way, but I guess we will never know, since he changed his mind already
in order to squeeze ~20 watts classA out of it, it would have to conduct more than amp all the time
it was never meant to, it would overheat and shut down, or burn eventually
i have no idea why thread starter requested that he wants to do it this way, but I guess we will never know, since he changed his mind already
I have built quite a number of amps (a dozen or more) with lm3886, because its so easy, and besides the normal circuit from the application sheet, I built inverted version with various buffers on inputs, and quite a number of transconductance circuits with current feedback. In ever case it was an improvement to the original circuit.
Building classA amp as first amp is not a good idea, in my opinion, but that is not my decision.
Tubes & The Gainclones
Building classA amp as first amp is not a good idea, in my opinion, but that is not my decision.
Tubes & The Gainclones
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Joined 2009
Paid Member
I don't think running this chip in Class A is going to bring any sonic benefit that stands the test of time. It's already a good sounding chip run as it was designed to be run. I've not found Class A amps to offer substantial benefit over very good AB amps and it doesn't take long to get a bit jaded by the heat output of a Class A amp. When I build Class A I mostly go in the direction of tubes, they are designed with integral heatsinks and that's a convenience that I like.
I think Class A does best at low power requirements, which means highly sensitive speakers (95dB or more).
If I had to use a chip for Class A then perhaps I would wire it as a constant current source and use a good power FET as a no-gain Follower. For gain I'd use a pre-amp and there are so many choices there.
I think Class A does best at low power requirements, which means highly sensitive speakers (95dB or more).
If I had to use a chip for Class A then perhaps I would wire it as a constant current source and use a good power FET as a no-gain Follower. For gain I'd use a pre-amp and there are so many choices there.
At the time of writing this post, i didn't fully understood the concept behind lm3886, specifically as IC, i viewed it as a transistor. Now i know it is in fact Push Pull amp in itself, awesome for many budget builds, but not for my usage.
That is why i have built this 🙂 Class A SE LM3886
Member
Joined 2009
Paid Member
Have you listened to other, better, Class AB amps ?
I ended up making my own AB amp and it gives me very good sound.
TGM8 - an amplifier based on Rod Elliot P3a
There are some independent sound impressions from builders. Not that you should rush out to build this one (it’s not a beginners project) but at least keep an open mind re: AB
