VK5TM


News, Updates and Other Minutiae

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.

February 2018

Updated Australian Band Plan page with the latest info (under 'Misc' heading).

November 2017

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'.

October 2017

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).

September 2017

Noise Canceller kits now available.

July 2017

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.

May 2017

New project added - my version of the X-Phase noise canceller. PCB available and a kit of parts to follow soon

Model Railway Electronic Project - Camp Fire simulator - Under construction - Dec 2017

All the Model Railway Electronic Project web pages are a work in progress at the moment, so they may ramble a bit or be a bit disorganised while I refine the various pages. Most of these projects were done quite some years ago without much documentation, so I'm in the process of documenting them, which may take a little while. In the mean time, what I have is being put up here. This is a little circuit that can be used to simulate a campfire or any other type of simulated fire. It uses red, yellow and orange LEDS, which, along with the adjustment pot on the pcb, can simulate anything from the glowing embers of a fire to a roaring camp fire by changing the rate of flicker.

Campfire simulator schematic Click pic for a larger image - opens in a new window.

I have designed a 'Universal' pcb that can be used for several different projects (that is why the 'Not fitted' references in the schematic above), but have not yet made one to make sure there are no problems with it. In the meantime, below is a preview of the pcb.

Universal Model Railway project pcb

To do: Expand this webpage with more info. Make a small diorama and video it to show how it operates. More as I think of it.