Line 6 Variax external power

[NickS]

So here's what I've put together. Much of this you will already have seen in my guitar thread.
The Variaxes can be fed external power through a TRS cable or the RJ45 VDI connector. I'm using TRS here as an alternative to the internal 6 x 1.5V battery pack. Current drawn by the Variax seems to be about 110 mA using the 9V internal battery pack.

These cheap DC-DC modules cost under a fiver, take a wide range of input voltage and have adjustable output.

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Lash-up to check it works with the Variax 300

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Boxed with USB input too.

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Got to have an LED at some point, but it's currently adjusted to provide 6.95V on the TRS cable, tested with +12V PSU, USB charger and USB power pack.

[NickS]

On load, my current USB power packs (2 x 5V 2.1A) shut down - probably inrush current or something. I'm not sure whether to try a more modern (5V 4.5A) PD-style power pack or try a different DC-DC converter. Or try some kind of current limiting. Oscilloscope out...