NAJDA Startup guide FW V1.3 - A NAJDA

VI. Customizing Hardware

Onboard opamps are mounted on sockets so that you can easily swap them with your favorite model. We have chosen the LM833 for its excellent performance to price ratio. If your budget is flexible and you believe the rendering could benefit from a different opamp model, feel free to replace these chips. Make sure to insert the new opamps with correct orientation.

With the same aim for allowing flexibility in selecting components on the analogue path, all the big audio capacitors are through-hole components so that you can easily replace them with your favorite model. Unlike opamps swapping, you will need here a soldering iron. See the silkscreen marks for the recommended capacitance values and for correct mounting orientation.

Before you replace opamps and/or capacitors, make sure to turn off the board and unplug the power chord.

WAF Audio – Najda Startup Guide FW V1.3 - A 18

Document/Firmware revision history

Version

V 0.1

V 0.5

Changes

Preliminary

Added DSP Overload led

V 0.6

V 1.0

V 1.1

Added individual IR keys for each source

Added Apple remote support

Official release – no change

Added volume rotary encoder

V 1.2

Added RC5 remote support

Added OLED and VFD support

Display bug fix V 1.3

V 1.3 - A Added changes relative to hardware revision 1.3.

Firmware unchanged.

Date

FEB 2013

APR 2013

MAY 2013

OCT 2013

DEC 2013

APR 2014

MAY 2014

DEC 2015

WAF Audio – Najda Startup Guide FW V1.3 - A 19

Table of Contents

I. Installing the Board

I.1. Board Sizes and Mounting Holes

I.2. Power Supply

I.3. Keypad Port Pinning

I.4. LCD Display Port Pinning

I.5. IR Sensor Port Pinning

I.6. Expansion Port 1 Pinning

I.7. Expansion Port 0 Pinning

I.8. Status Leds Port

I.9. Other Ports

II. Ins and Outs

II.1. Analogue Ins

II.2. SPDIF Ins

II.3. Analogue Outs

II.4. SPDIF Outs

II.5. External Relay Command

II.6. USB Port

III. Operating Najda Standalone

III.1. StandBy

III.2. Mute

III.3. Volume

III.4. Bass

III.5. Treble

III.6. Balance

III.7. Menu

IV. Testing Your Project Build

V. Connecting Najda with the PC Application

VI. Customizing Hardware

Revision History

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12

12

12

12

12

12

12

15

9

10

10

9

9

10

9

5

5

3

4

1

2

2

7

8

9

17

18

19

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