I have, for quite a while, provided modified versions of the code for my projects free of charge. However, the cost of webhosting for this site has tripled in the last couple of years and the little I make out of the pcbs I sell goes nowhere near covering this cost.
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.
A modification plus software to allow the Simple DDS VFO to be re-calibrated as often as you want without having to re-program the PIC has been added to the Simple DDS VFO page. Simple DDS VFO bug problem fixed. Code uploaded to webpage as version 'c'.
There is a bug in the Simple DDS VFO code. See Simple DDS VFO page for the problem and updated code. Included an add-on for the Simple VFO project to indicate which step size has been selected. Simple DDS VFO project updated and software file uploaded. The pushbutton on the encoder is used to change step size (step sizes 10Hz, 1kHz and 10kHz).
Noise Canceller kits now available.
Updated both the DDS Xtal Substitute and DDS Xtal Substitute Mark 2 projects into one project. The original webpages are available to download as PDF's.
New project added - my version of the X-Phase noise canceller. PCB available and a kit of parts to follow soon
A programming adapter for use with the PicKit 3 programmer
When the PIC programmer that I have used for several years finally bit the dust, I had to decide what to replace it with. Because I needed it in a hurry, I decided to purchase PicKit 3 programmer from Microchip. Also needed was an adapter to program the PIC's in, which, of course, doesn't come with the PK3. As I had already made an adapter for the previous programmer, I had a look to see if it could be adapted for use with the PK3. The result is shown below. It is mounted on a piece of scrap chipboard to make it easier to use. Note that I have only tested this with 12F and 16F series PIC's only, so I'm not sure yet if it works for any of the other PIC series. The only thing I had to add was a switch to select between VPP and VPP2, as the old programmer was smart enough to switch between different VPP lines depending on the size (28/40 or 8/14/18/20 pin) of the PIC being programmed. I used a very small switch that could be soldered to the pcb. You could use any handy SPDT switch and make a small mounting bracket for it, of course. Don't forget to label which position is which, otherwise it is very easy to kill a PIC if it is in the wrong position. As you can see, I used a bit of ribbon cable with marker (to identify pin 1 on the PK3 connector). For the other end, I used a piece of single in line header and sealed the connections with some hot melt glue. The pcb layout is pretty straight forward and as is usual with my projects, you can download the layout file at the bottom of this page. Since the photo's were taken, I have marked the top of the pcb with the position of the various size chips. Below are some small graphics that you can use to make labels for the positions, they are available to download in the zip file below as well. I have been using the standalone PK3 programmer software and some enterprising person might like to have a go at including these into that piece of software. (The source code is available on the Microchip site.)
These files are provided free for personal use ONLY. I retain all copyright on all works published on this website. They may NOT be used in any commercial or profit making enterprise of any kind without the express WRITTEN permission of the copyright holder.
(Right click and 'Save as..' or what ever is required by your browser) VK5TM PicKit 3 Prog Adapter.lay6 The Sprint Layout 6 pcb file. See the PCB Info page for information on using this file. Adapter PIC placement graphics The graphics from above re placement of the PIC's in the zif socket.