Tuesday, July 22, 2025

Resuscitating the Donner octave pedal

On Sunday, I wrote1: [the pedal]showed exactly the same problems as the previous one! This led me to hypothesise that the pedal and its predecessor are fine - there's some other pedal that is causing interference.

I used the scientific method: first I took the pedal off the pedal board; I plugged the guitar into the input and plugged the output into the amplifier. The power for the pedal came from the power distributor on the pedal board. At first I was using the wireless connector; this did not solve the problem. Switching the wireless connector for cables made no difference. I'm not sure where the inspiration came from, but I decided to change the power cable. I was using a cable that had the same plug on both sides of the cable so I switched this for a cable that has an USB plug on one end - the power distributor has an USB plug - and suddenly the pedal was capable of transposing up! Presumably the pedal requires more power when transposing up than transposing down and the USB socket can supply that power.

The pedal is rated at 500 mA and the power distributor is rated at 2.1A; with several pedals being powered, it seems quite possible that the are overpowering the distributor. This is probably why the original pedal stopped working when I purchased the multi-function pedal2. At least I'll know what to do if there are problems in the future: either I'll remove the multi-function pedal or the tremolo pedal. So in a sense I was correct when I wrote there's some other pedal that is causing interference, but it wasn't in the way that I originally thought.

Internal links
[1] 1965
[2] 1942



This day in blog history:

Blog #Date TitleTags
26622/07/2010Porting the Amateur ReasonerProgramming, AI
26722/07/2010Beef ratatouieCooking
61222/07/2013Transferring cassettesPersonal, Old recordings
74122/07/2014Rice and beansCooking
74222/07/2014And now for something completely differentFilms
88222/07/2015Vinyl log 20 - 22 JulyVinyl log, Fotheringay
179322/07/2024Italian phrasesItaly

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