Cheaper way to get a Line 6 Variax Cabled Power Kit in James Tyler Variax Guitars / Workbench HD Posted December 7, 2021 Hello there! For everyone who wants an easy to understand diagram for the Variax power supply via stereo guitar cable, I made it. Here is the list of parts you need to build this box with a links to amazon. Links are just for example so you know how do that parts look. You can order not exactly the same parts (excepting DC-DC step-up board). You can use different TRS/TS jacks, button, USB cable and socket for it. Spoiler 1) USB to 5.5x2.1 mm — https://www.amazon.com/3-Pack-2-1mm-Power-Barrel-Connector/dp/B07JGR7JJQ/ 2) 5.5x2.1 mm socket — https://www.amazon.com/FILSHU-Socket-Threaded-Connector-Adapter/dp/B08272H1SR/ 3) Button — https://www.amazon.com/Coolais-Waterproof-Button-Latching-PBSL-02/dp/B07F9K3F82/ 4) LTC1871 DC-DC step-up board — https://www.amazon.com/HiLetgo-DC-DC-Converter-Supply-Module/dp/B071WW6Y4T/ 5) 1/4" TRS Jack — https://www.amazon.com/ZXHAO-6-35mm-Female-Socket-Headphone/dp/B07M62VBZR/ 6) 1/4" TS Jack — https://www.amazon.com/ZXHAO-6-35mm-Female-Socket-Headphone/dp/B07MR2TT3Q/ Here is the diagram. I use a box built in according exactly to this diagram with my own Variax 300 and it works fine. Spoiler Here is how my power supply looks inside and outside. There is a small difference between my box and the diagram: two more cables from a button. I used not a simple 2-pin button, but a 4-pin button with a built-in LED indication. But there is no need to use an LED-button, if you will mount your power supply in a box like mine: with a 'window' for a step-up board. There is an LED and a voltage meter on the board, they shine bright when you power-up the board. Spoiler I hope this will help everyone to build your own power supply and become free from batteries!