Cmoy Headphone amplifier

Just finished with my Cmoy headphone amplifier inspired from Headwize.com.
Chu Moy made a very basic and simple headphone amplifier based on OPA2134 op-amp by Texas Instruments.

I was having OPA4134 so thought of using the 2 spare channels for a line out, may be to drive another pair of headphones.
Apart from running headphones crystal clear, another advantage is that it can act as gain enhancer for my gainclone when watching movies from PC. here are the pics.

Lm4780 Single Sided PCB v3

"A PCB can always be improved" is the thing i learned when i further modify my existing freezed single layer PCb for lm4780.
It has only 4 jumpers. 1 in +V, 2 in ground supply and 1 in mute circuit.

Rin1, Rin2 and RGnd will come on track side. And Ground connections for speakers will be taken from power supply board.

PCB - PCB layout
Parts layout - Parts layout

3 Way Amplifer Project . . . . .

Well, in bits and pieces i had 3-way filter and LM4780 modules, but i always wanted to make a compact and high power amplifier system. Progress is ON! and just the integration of modules is remaining... Check out the pics -->

3-way filter will also come inside. Front will be glass panel. And inputs will come at right front glass panel and the heatsink.

Power Supply is in seperate enclosure. Regulated to 30 V using a pair of LT1083 (free samples :) ). I plan to put a higher VA Transformer later.

3 Way Active CrossOver.

I made 3-way active crossover circuit based on a project published in 'Electronics World', it was basically a 3-way subtractive cross-over. Its online version can be found at - 3-way subtractive X-over.

I made its PCB but when i run it, to my dissappointment, the output signal level was quite Low. Meantime i compared a subtractive crossover design as compared to a 24th order Linkwitz-Riley X-over, i decided to make a new filter based on Linkwitz-Riley design by Rob Elliot Project 09.

Its PCB is ready, just a little soldering is pending. Very eager to see it sing.