[Earwax]

I was thinking about building a couple of the Sijosae buffers
http://www.head-fi.org/forums/f6/mon...er-pcb-345035/
http://www.head-fi.org/forums/f6/ic-...r-pcbs-380773/

I see about a dozen variations of the bc327 transistor on Mouser.com. all to-92. Some are just bulk vs. reel. So let's narrow it to just the bulk package, and there's still 6 from Fairchild and one from Vishay.

I see 3 Hfe grades, 16, 25 and 40. Which Hfe would be best for audio buffers? (just to drive average 50 to 300 Ohm headphones)

What other specs should I pay attention to? The data sheet isn't clear are what the other differences are (or I'm missing it). Like, what's the differene between the 15 cent BC32725 and the 6 cent BC32725BU? (both Hfe 160 class)

I decide to post a new thread instead of in the project thread because I'm hoping for general enough information to be able to apply it to other projects as well.

 

[digger945]

Each one will probably sound different.
I have two diamond buffers for a millet hybrid, each having different transistors, each sounding different.
I dunno which hfe is better for the sijosie buffer, maybe you can socket them and try more than one.

 

[Earwax]

I searched here before posting, I shoulda checked headwize too.
HeadWize: DIY Workshop > transistor differences - what's the difference?

and on mouser pricing
ordering transistors from Mouser - different types? confused

 

[Forte]

Thanks for posting those links. Often wondered about the Mouser pricing difference for what seemed the same part myself.