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My first ultra small amp, sounds pretty good...

post #1 of 5
1/30/10 at 6:55pm
Thread Starter 
I wanted to build a powerfull yet small amp to go with My Clip+.

What I wanted was a digital POT, Lithium ion battery and enough oomph to drive a set of full sized cans...

So what I ended up with was this, its powered by a 7.4v (8.4 on a full charge) 430ma battery, uses a DS 1802 Digital POT with illuminated NKK push button switches for volume controll.

It is just a hair bigger than the Clip+, but initial impressions are that is sounds realy good! I wasn't sure how it would sound but I am plesantly surprised.

In the pics you will note that it is not fully assrmbled yet, I am still waiting on the DS1802 and a couple other parts for the volume control. So right now I have just been listening to it with the DPOT shorted.

The PCB was designed on Express PCB, and is a 4 layer board.
LL
LL
LL
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post #2 of 5
1/30/10 at 7:06pm
Very cool! keep us updated.
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post #3 of 5
1/30/10 at 7:45pm
nice job, especially with designing the pcb and getting it made, very professional ^_^
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post #4 of 5
1/30/10 at 8:57pm
Nice thumbnails. <grumble>

How hard is it to implement a digital pot?
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post #5 of 5
1/30/10 at 10:04pm
Thread Starter 
Quote:
How hard is it to implement a digital pot?
I'll try to scrounge up the sorce I used for the DPOT scem, I borrowed it from somewhere on the net. Only tric is that the D1802 needs a 5v power suply, So I am still a bit worried if there will be any "clicks" due to a possible ground referance diferential. There shoulndt be, as I used a couple of 2.5v shunt regulators to power it from the rail splitter chip, so it really sees +2.5 and -2.5. I think it should work flawlessly, but i too special care to rout the power suply all the way back to the rail splitter so as to lessen any impact on the main V+ and V- plains.
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