Codan 8727 info

[VK3ZYZ]

The new front print is not quite as good quality as I'd hoped.

Still, it will have to do until I can get my better quality 3D printer working reliably again.

 

[VK3ZYZ]

Here is a board for the Codan 8727 band select drive.
See post #26. This also has other used as there are optional terminals so it is not just for the Codan. The board mounts upside down onto the Codan header.

I hope to get some boards made soon. This board could be a handy add-on for quite a few things.
See the MIC2981 data sheet for the chip.
Address selection....

 

[VK3ZYZ]

I've been having problems with bumping the encoder knob so shifting the frequency.
So, here is a mod.

Now, a front panel button toggles the LOCK/TUNE, and another toggles the USB/LSB selection.

An easy way to lock the encoder is to ...
step_size = 0; // LOCK
or..
step_size = 2; // TUNE

Originally, the step_size was 1000. I had 10 but now 2.
For some reason, a step size of 1 does not work correctly?????

If the encoder knob it turned rapidly, it still changes the tuning as the acceleration is still working, but this will do I think.
The LOCK/TUNE label may be moved to the top left, under the frequency display when I figure out just how the display positioning has be set up, but I may just keep it where it is.
FYI, here is the code.

 

[VK3ZYZ]

The new board works. I had to alter the address in the code as address A0 link was set while the proto used A2. And this board has a PCF8574A, (address range 0x38 to 0x3F), not the PCF8574, (address range 0x20 to 0x27).