H5 A3 & B1 AMP UPDATE FOR X2 MODULE

[exxos]

Continuation from the previous thread.. https://www.exxosforum.co.uk/forum/viewt ... 602#p52861

You only need to do this mod if you plan to use the MIDI SYNTH X2 module. The amp board will correct the volume levels for the X2 and mix it correctly with the YM audio. The amp board will be added to future H5 revisions.


The 2 caps circled on the X2 board need removing and solder blobbing over. These caps create a lot of hiss in the audio and have to be removed.

IMG_5890.JPG (343.54 KiB) Viewed 6172 times

[exxos]

Assuming your not using the DMA internal headers.. Solder a header pin here..

IMG_5904.JPG (330.37 KiB) Viewed 6170 times

[exxos]

Remove the 2 caps C61,C59 .. Solder a bodge wire onto the 2 left pads as shown..

x2.jpg (396.65 KiB) Viewed 6167 times

Also solder a bodge wire on "3" on the header pins (top right of image)

[exxos]

NOTE: This "winamp board" fix should no longer be done.


Solder amp board on the GND header and solder the 2 bodge wires...

IMG_5902.JPG (430.83 KiB) Viewed 6166 times

[exxos]

Solder a small bodge wire onto 5V (I used the floppy power connector)

5v.jpg (383.57 KiB) Viewed 6166 times

[exxos]

Long bodge wire on OP as shown below......

IMG_5905.JPG (385.67 KiB) Viewed 6163 times

The other end goes to the H5 amp circuit. Remove the capacitor and solder the wire on the top pad as shown below.

op.jpg (227.36 KiB) Viewed 6163 times

[exxos]

A quick dump of a small midi player and some midi files to try it out with..

MIDI.zip

(109.59 KiB) Downloaded 214 times

[exxos]

AMP BOARD MOD - Should probably do this one first


Circled are 2 resistors which need to be "rotated" and resoldered in as shown below...

IMG_5908.JPG (307.41 KiB) Viewed 6159 times

EDIT:

I guess the people who do the above mod last didn't read the install guide fully before starting

[AndresPlazaR]

Just to double check: this amp board is only needed in the A3 boards, not the B1? Asking because of the post subject, and I thought it was also needed for the B1...

If, indeed, is needed for the B1, when it will be available in your store? Just to make one order/shipment with other products.

Andres.

[exxos]

Just to double check: this amp board is only needed in the A3 boards, not the B1? Asking because of the post subject, and I thought it was also needed for the B1...

Its needed for the B1 also, It should be the same install as A3...but maybe I forget something I don't know.. I will put B1 in the subject...

when it will be available in your store? Just to make one order/shipment with other products.

I am working on this now...