[eric343]

Hmmm......... I may have to build this

 

[dip16amp]

Here are pics of it on a 16 pin DIP socket and a penny heat sink soldered to it. It sounds quite good with a dual voltage +14v and -14v supply. Drives my Grado headphones with very good bass. The penny does get very warm so a binder clip keeps it cool.

 

[was ist los?]

dip, how does it compare to other amps you've built?

 

[dip16amp]

I'm amazed it how much power it can put out and how simple it was to put together. The 700 mA output current spec is what caught my eye and it certainly has more bass than my double buffered BUF634 X12 amp. Only my X16 (gilmore) amp has more bass.

 

[kevin gilmore]

3 penny opera anyone

 

[00940]

with audio quality going up with impedance and such a good current capacity, what about using it as a preamp ?

 

[Garbz]

i thought ur Gilmore V2 amp in DIP sockets was amazing but now you bring smd parts into the equasion, and with a penny as a heatsink! Now that is awesome

 

[JohnFerrier]

To try to find weaknesses of this part, beyond the noise spec that may not be the best it could be, I notice that the performance at low frequencies is not as good as at mid and high frequencies...


JF

 

[GainHead]

Mr. Gilmore, would you mind sharing the resistor values you used with your build? I think I am going to try a dead bug arrangement with this sucker and sure as hell do not feel like swapping resistors out. Thanks!

 

[was ist los?]

I believe he merely copied the schematic on the datasheet.

 

[null]

could someone build this for me?

 

[eric343]

Quote:

Originally Posted by kevin gilmore board picture http://gilmore.chem.northwestern.edu/micro.pdf Yes that is real size .9 x .9 inch. You solder the chip thru the backside of the board then solder on a piece of copper that is .3 inch wide and about 1 inch long.

I think that PDF's scaling is a bit off. I printed it out and there's no way you could solder the chip on that -- the pad spacing is off by a few mils, and the board is for a chip package .193in wide vs. the TPA's .292in...

 

[chillysalsa]

Looks really interesting..
Dip16amp (or anyone else) - how would one rank the sound of this with your X16 Gilmore amp or RA-1 with a pair of Grados? If bass is so good, everything else fall into place as well?

 

[kevin gilmore]

Correct, wrong package. Working on fixing that now. Glad i did
not have boards made yet. This whole heatsinking thing is a pain.
Nice thing however is that the chip is symetrical. So with a little
work you can solder it in upside down. Then you can attach a real
heatsink.

fixed file with same name uploaded. This is the top copper and silk only.

On my printer the vertical size is exact and the horizontal is ever
so slightly small.

 

[DCameronMauch]

Quote:

Originally Posted by kevin gilmore Nice thing however is that the chip is symetrical. So with a little work you can solder it in upside down. Then you can attach a real heatsink.

That's exactly what I was thinking. Going to pick up some random cheapo soic chips localally to practice bending the leads with some tiny needle nose pliers. I am somewhat worried about the mechanical strain this places on them. Mostly the output pin. Besides making it weaker, doesn't it also add a little resistance at the bend? With regular through hole stuff, when I need to bend it, I always use the shaft of a small screw driver to get a nice rounded bend, thus minimizing the strain. I am kinda suprise this chip is not available in any other type of package.

Started working on a PCB design myself. But I think I want to use two of these chips for balanced output. One chip per channel. One side inverting, the other non-inverting. Should do the trick nicely. Though this doesn't apply to my intended implementation, the voltage rails could be a lot lower this way too. Downside is you now have two protection output resistors in series with the load, thus slightly lower damping factor. I use HD650s, so with their 300 ohms, it shouldn't be a big deal adding 2x 10 ohms.