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Battery Monitor DDS Signal Generator DDS Auto Band Filter switching DDS Xtal Substitute-2017 Update DDS Xtal Substitute MK2-Retired DX160 Mods Frequency Dependant switch Noise Canceller - aka X-Phase Noise Canceller - 3d box PCB Info PicKit3 Programming Adapter pcb PSK Si5351 Local Oscillator module Pt1 Si5351 Local Oscillator module Pt2 Simple DDS VFO-2017 Update Simple DDS VFO-2021 Update Simple DDS Sweeper Simple SDR
Band plans Encoder Headaches FT757 Battery Replacement Desk Lamp LED Conversion NEW Old Radio's QSL Cards Tips & Tricks
G3OAG Filter/leveller for DDS modules F5ITU Simple DDS VFO Mods Philips PM5326 DDS Mod
Layout Electronic Project - Camp Fire Electronic Project - Flouro Simulator Electronic Project - Random Flasher Electronic Project - Welder
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Help wanted Can anyone help identify a piece of music from the 70's? See the home page for the details

November 2021 A desk lamp mod (well, more of a bodge) - halogen to LED conversion using LED strip. Find it under the 'Misc' category.

August 2021 The Simple DDS VFO has been updated to add band change functionality. It is on it's own page in the homebrew menu.

June 2021 Battery Monitor project updated and finalised.

May 2021 Added another Rant about the scabby manuals that come with stuff these days. Added page and files for a 3d printed box for the Noise Canceller courtesy of Gary VK6GS

January 2021 Paypal button added to Noise Canceller page. Updated the PK3 programming adapter - some spare pcb's available.

Privacy Policy uploaded. It may be viewed at the Privacy Policy link in the footer. As of October 2017, I will be asking for a donation in exchange for providing custom modified code for my projects to help keep this site available. GPDR and all that stuff In accordance with various bits of legislation around the world, either currently in force, about to come into force or proposed, you will now find that annoying "We use cookies" notice at the top of this website. The full Privacy Policy is available at the Privacy Policy link in the footer at the bottom of the page. (If you don't know what GPDR is, Google it. Real scary shit for ANYBODY with a web presence.)

F1ITU Simple DDS VFO Mods

Daniel F5ITU:- "I just finished the adaptation of your software to "Simple DDS VFO" for my personal use. It works well and I will soon install it on my "DC receiver". So, now I have a VFO (10Hz step) and which performs a 600 Hz shift when it receives a transmission command on GPIO-3. In addition, I added to the printed circuit, an amp to increase the output level so I can get the necessary 7dBm the SLB-1 RX."

F1ITU DDS amp schematic F1ITU DDS pcb top F1ITU DDS pcb bottom

Daniel kindly sent these images of the changes to the code, along with his actual ASM file as well as his Sprint layout file for his pcb. You can find them at the end of the page. Because the following images may be a little hard to read, I have put them in a zip file you can download, also at the bottom of the page.

ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods

Daniels code file. PIC12F629-08.asm And his PCB layout. See the PCB Info page for information on using this file. DDS_Dan-1.lay6 The coding images from above. F5ITU.zip

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