[Heady]

Quote:

Originally Posted by amb Yes. The above, plus install 1KΩ resistors in place of the two input coupling caps, change R4 to 6.2KΩ, R3 to 1.2KΩ, and C3 to 10pF.

amb, thanks very much for your clarification. I also want to point out that in Tangent's list of parts, C3 is already 10pF. Just in case it mystify someone else beside myself.

 

[splaz]

I meant similar as in with the keeping the ferrite out of the feedback loop. But yeah I put up a ground one anyway.

Well I have two boards so this is definitely something I'm going to try. I'll make one with input caps first though to make sure I can get one that actually works.

If you do it Filburt, put up a pic of the C3 stacking. Sounds interesting.

 

[amb]

Quote:

Originally Posted by splaz put up a pic of the C3 stacking. Sounds interesting.

Here's ours. Each "C3" is actually R4 and C3 stacked together. Note that this is one of tangent's green prototype PINT pcbs.

 

[dhp]

so in addition to the normal positions of R4, you also stack an additional 2 R4's onto the C3s?

 

[amb]

Quote:

Originally Posted by DieInAFire so in addition to the normal positions of R4, you also stack an additional 2 R4's onto the C3s?

No. Leave the original R4 position empty. The purpose of doing this is to put the output ferrite outside of the feedback loop. See the schematic.

 

[mb3k]

For the people who came into this thread a little late, I compiled a summary to Mini³fy the PINT amp:

http://www.mb3k.com/hosted/mmmpint.pdf

Thanks to
amb, Morsel, Tangent, Filburt, and all other contributors

 

[Heady]

Quote:

Originally Posted by mb3k For the people who came into this thread a little late, I compiled a summary to Mini³fy the PINT amp: http://www.mb3k.com/hosted/mmmpint.pdf Thanks to amb, Morsel, Tangent, Filburt, and all other contributors

Excellent, mb3k.

 

[seanohue]

one question about the cut: is basically what your doing there is cutting the trace that connects pin 7 to L3? How deep does the cut need to be to do this?

 

[cire]

deep enough to sever the trace. less than a millimeter would be enough

 

[seanohue]

Ok, simple enough

 

[Teerawit]

Quote:

Originally Posted by seanohue Ok, simple enough

Remember to check for discontinuity after delivering the scalpel

 

[Jam_Master_J]

Quote:

Originally Posted by mb3k For the people who came into this thread a little late, I compiled a summary to Mini³fy the PINT amp: http://www.mb3k.com/hosted/mmmpint.pdf Thanks to amb, Morsel, Tangent, Filburt, and all other contributors

Good Work. I plan on Mini3ifying my PINT.

 

[dhp]

is it just me, or are the arrows in the PINT picture switched? In amb's before and after pics, the after picture has 2 arrows, but it seems like they're pointing to the opposite thing?

 

[amb]

Quote:

Originally Posted by DieInAFire is it just me, or are the arrows in the PINT picture switched? In amb's before and after pics, the after picture has 2 arrows, but it seems like they're pointing to the opposite thing?

If you're referring to the "cut here" and "jumper here" arrows, they are correctly oriented. Look at the before and after pics carefully -- red means "connected", black is not connected.

 

[dhp]

Quote:

Originally Posted by amb If you're referring to the "cut here" and "jumper here" arrows, they are correctly oriented. Look at the before and after pics carefully -- red means "connected", black is not connected.

doh, flipped the colors in my mind