It was me who designed the Say It Again Later board based on the Holtek chip and it's interesting to note that despite "strikesandspares" claiming they designed their version a year earlier, they seem to have used a near identical layout on the input section and shuffled the PSU components slightly.

But what's really interesting is that I didn't follow the Holtek datasheets examples since they used a lot of electrolytics and quite frankly we can do without those wherever possible. So I used completely different component values to allow the use of standard 100n decoupling capacitors wherever possible, and adjusted associated resistor values to match. I also deviated from the official Holtek design to keep the component count as low as possible and also shuffled the address lines between the echo and RAM chips to get the number of the links on the board down to just two. That way it can be built on a single sided PCB making maintenance and modification much easier than on a double sided PCB. I also modified the original Bally PSU design to reflect the lower power requirement and to reduce the loading and heat dissipation.

And it appears that strikesandspares have obviously redesigned the circuit identically to the exact non-standard component values, configuration and placement I came up with. And they did it exactly one year before I published the design. Isn't that just completely AMAZING.

But seriously... I put the design up as an open project to copy and replicate as desired. I don't even have a problem with people selling modules based on the design, because it's such a specialist board that nobody's exactly going to get rich selling it. I mean it would be nice if you did give me a wee mention on the PCB, but you could also just change the date of the design to one year earlier and put your own name on it instead I suppose.