TS-520S VFO using the Arduino Nano VFO board.

VK3ZYZ

Moderator
Staff member
I had to install a pre-regulator as the Arduino reg was overheating.
This is a little switch mode reg set to 7V out. The PCB will be modified to add an external 7805 to drive the 5V so to bypass the Arduino regulator.
View attachment 2583
When I finish the testing, I'll clean the PCB. It looks pretty crook!
Latest circuit...
1720612821706.png
 

BillC

Active member
Nice work Denys. The matrix of 66 holes in the lower right hand quarter of the board, is that used for possible future mods.or sub circuits?
 

VK3ZYZ

Moderator
Staff member
Yes, as this is a proto board, I filled the spare space with hole for "Justin Case".

A second version to add a 7805 external reg may get made as the Arduino internal reg is not up to the load.
This is a change from the one that was posted here a couple of days ago.

1720846957538.png


This one will run as a counter when not being the VFO. My proto tests seems to work ok so now it is just a matter of getting boards and tiding up the code.

EDIT! I need an extra divider chip as the Arduino counter cannot keep up with the frequency.
 
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VK3ZYZ

Moderator
Staff member
1720852811313.png

The circuit is a bit hard to read so here too is a .pdf.


EDIT! I need an extra divider chip as the Arduino counter cannot keep up with the frequency.
 

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VK3ZYZ

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Staff member
Oh well, I have placed an order for the PCBs so let's hope they are ok!


EDIT! I need an extra divider chip as the Arduino counter cannot keep up with the frequency.
 
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VK3ZYZ

Moderator
Staff member
I had a bit of fun this AM. While hooking up the proto system to do a test. "something" went wrong. (I do not know what) but there was quite a flash and bang and a Tantalum capacitor let its smoke out with enthusiasm.
.
Photo on 17-7-24 at 10.05 am.jpg

It looks like now I have another dead Nano, Si5351 and OLED display :(
 
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