NE5532 front tone plate with high-school bass adjustment and volume adjustment

I also belong to the audio enthusiasts, of course, is a rookie, I bought a pair of more than 400 yuan horn box, the recent reference to the principle of the netizen, according to their own style on the drawing of a tone board, the schematic is as follows:

A good PCB is as follows:

In the choice of capacitors using the ring Wima capacitor, resistance is also used 781 military resistance, with the Nikon filter capacitance, LT's 317 and 337, the final effect is very good, sound open to the maximum, the noise is very small, in the acceptable range, no self-excited phenomenon.

and other similar to different places mainly in the design of the power supply, I gave 317 and 337 using a relatively large radiator, generally do not need a radiator, in order to be more stable in the summer work, add a radiator is very good, do not add the words 317 and 337 is relatively hot.

The welded picture is as follows:

Proofing more than 10 pieces, and now have a lot of boards, after all, they can only use a piece, O (∩_∩) O. Need friends I can send free PCB, but the courier costs need everyone to bear.

The specific method of obtaining this can be seen here. Http://www.dowellbbs.com/forum.php?mod=viewthread&tid=53&extra=page%3D1

NE5532 front tone plate with high-school bass adjustment and volume adjustment