The HDD Synth MKII prototype was a big leap over the original, mostly because it fully worked as intended!

Having the hardware volume control on the card itself was a game changer in terms of usability for the device. Through software enhancements, having the ability to change to different sound packs was also wonderful to get working. Plus the real party trick being it playing a spin down sound when the PC is switched off.

Of course, there were things that I wanted to improve or add such as

• Adding a rear ISA bracket and ensuring the controls were accessible through it
• An RGB status LED to provide better feedback
• ISA based IDE activity detection so that it's a true plug and play device

Introducing the HDD Synth Prototype MKIII

This is intended to be the final prototype before going into production so the product can be released. It incorporates all of those enhancements, but it is also designed to be machine assembled using smaller surface mount components rather than through hole as I've used up to this point.

As I've learned more about how best to use KiCad the schematic design has become more refined and cleaner. So every element of the project has improved since the beginning. 

I've been speaking to a number of manufacturers about producing a custom metal bracket for the device. This has exposed me to a new world of creating STEP files by using 3D CAD modelling software and the costs and complexities of manufacturing such an entity. 

It's also got me worried about whether or not the mass produced PCB would perfectly match the mass produced metal bracket. How could I ensure everything would work together and fit into a PC?

It's time I finally bought a 3D printer...

After researching and speaking to some other people I decided upon the Bambu A1. For just over £200 it provided a very solid entry into this new world of 3D printing for a very acceptable price.

Seeing the PCB and bracket designs I'd created on the computer emerge into the real world through my 3D printer was a really unique experience. 

Thankfully after assembling the two pieces with two M3 x 4mm screws I was rewarded with a snug fit into my 386 test computer.

Most of the MKIII PCB design is completed, so I'm hoping to send it off for an initial manufacturing run within the next few weeks. Exciting times!

It's also been exciting because of a visit to see Neil at the Retro Collective recently where he kindly let me demonstrate the HDD Synth for an upcoming video on his YouTube channel. 

Getting the word out to a wider audience is equal parts exhilarating and nerve inducing as my little personal passion project goes under the glare of the public. Whatever happens, it's been a fantastic journey so far and I can't wait to see where it all goes next.