320x240 graphics display hardware photos

These are from my development rig which uses the following display.

EA W320B-8K3CTP white on blue

• Resistive touch panel
• CFL (fluorescent) illumination - needs EA CXAA-E005W inverter (15ukp)
• Cost 208ukp (including inverter)

See: Displays

Completed front panel      Dimensions are 130 x 330 mm
This panel will soon be on front of a box.     See:   box design PDF

This is made from doubled sided PCB. The rest of the case will also be double sided PCB.
It contains:

• Eight encoders on the left. These are user-assignable to DSP parameters
• The obligatory Menu Encoder to the left of the screen
• A 18 key pad - see Keypads
• A tuning encoder on the right (Agilent, 256pp/rev)
• Two potentiometers bottom right - these are user-assignable to DSP parameters.
• The display panel has a touch screen and the 'button labels' down the right side of the display are touch buttons.
  (The strip of eight hardware buttons has not been used)

Please note that the minumum configuration for TrxAVR-Picastar is:

• Tuning encoder
• Menu encoder
• 4x3 key pad and four other buttons (Menu, ESC, Display and Shift)
  Shift gives access to soft keys if you have no real plastic soft keys!

The front of my breadboard rig with the completed front panel. (Ian, G3VPX)
At the bottom is the 40x2 Optrex character display. For development purpose, TrxAVR-Picastar can simultaneously support
a NT3881 character display and one graphics display option. (Needs alternative control lines for the character display)

Side view of the breadboard rig. This is built using Glenn's Picastar boards.
TrxAVR-Picastar replaces PicNmix. The rest is Picastar technology.

Rear of EA320-motherboard
For a description of the motherboard's fucntion see : Displays
At the top is the inverter for the CFL (fluorescent) display illumination.
The unsed IDC connectors are for TrxAVR-B. (I am using TrxAVR-A)

Front of Motherboard/Display unit
This has the vertical strip of eight soft buttons on the right. I removed these as I have touch panel.

Top view of motherboard/display assembly
Initially, there was timebase interference from the EA display board.
This was completely cured by a thin brass shield between display board and motherboard (in the mounting pillars)
I went further and added brass sides - but probably not needed ... maybe I like soldering brass.
If the display is in a front compartment seperate from the RF circuits, then the brass shield may not be needed.
(I will not be able to answer this question because I'm not going to take it all to bits to find out!!)

Note the stacked, turned-pin SIL sockets to bring the button boards to front panel level.

Motherboard - front view with display removed
The cutout is for the display IDC cable. The four-way flying lead connects to the rather short touch panel ribbon cable.

Motherbaord - rear view with display removed.
The EA CFL inverter is at the top. The large heat sink is for the 5v supply to the inverter. The 7805s on TrxAVR-A do not have
heatsinks. These are ok with the LED display (190mA) but heatsinking is inadequate for the 410mA needed by the CFL inverter.

Detail view of button board mounting

Encoders8 board mounted behind the 8 encoders

TrxAVR-Picastar home page