TDA1517 bridging... Possible?

[edvard]

I have a "junk box" (don't we all?) that has a few old ISA soundcards in it that happen to be populated with TDA1517's (couple TEA2025's too, but let's pretend they don't exist ) and I can't resist putting salvage parts to good use.
I had the bright idea to bridge the outputs to get more watts out of them, but because of the super-simple construction of these little chipamps, you don't have access to both inverting and non-inverting inputs.

SO... I'm planning on running the inputs from a FET phase-splitter circuit; say a 2N3819 with 4.7k at source and drain.
Pretty sure that part will work, but before I blow something up, what do you guys think?
Would bridging be too much for the part?
It's the DIP package, so I'll have to get creative with heat management...

[Gurner]

Yes, that'll work....I'm sure you're aware that a bridged amp sees half the load, so you might want to up the impedance of the speaker you're using (or as you say, get creative with the heatsinking arrangments)

[edvard]

Oooh... so I could just use TWO speakers and make a mini-twin 

The datasheet says that pins 10-18 on the DIP package are all internally connected, the SIP package has a tab for connecting to a heat sink.
Consequently, the junction-to-pins thermal resistance is twice that of the SIP package.
Ya think If I just soldered all 9 of those legs to a large copper pour on the board, and bolt a heatsink to that, it would be enough?

I'm still learning a lot about heatsinking, it's apparently an arcane black art that requires blood initiation to master...