9V Adapter Rehouse with Ground Switch

phi1

Well-known member
Recently I've been using more headphone setup, either using the Strymon Iridium or the Spark Neo (which I love for the convenience).

One issue is that if I'm testing pedals with a 9V wall wart adapter, not my regular pedalboard and not connected to the Amp, I have no connection to Ground. This results in a sufficiently annoying buzz sound.

One quick and dirty solution I've been using is this clip-ground cord from amazon. The 2 prongs into the outlet (hot & neutral) are just plastic, and the Gound prong is metal. You can then clip the alligator onto the pedal somewhere (jack, toggle switch) and the buzz goes away. This works but is kind of annoying to use.

So, I now did a re-house of a D'addario 9V adapter into a 1590A, with a switch to connect the negative of the 9V cord to the wall Ground. I used a 3 prong cord to connect to the outlet, with the added benefit that it takes up less space that the wall wart which has to hang sideways. Inside the enclosure, the 2 red wires (previously attaches to the 2 outlet prongs) are now connected to the WHITE and BLACK wires of the 3-prong cord (interchangeable). The GREEN wire is connected to the switch, and the negative 9V output wire is connected to the other side of the switch.

The input and output wires are secured with JB-weld, and the circuit is also secured to the HOUSING with JB-weld. I used double-sided foam tape to keep a cushioned barrier with the bottom of the enclosure, and some electrical tape on the sides of the enclosure just in case.

Tested it out and it works perfectly, no buzz when grounded. I wish there were off-the-shelf products already like this. (Maybe there are?) It could probably work just as well without the toggle switch (always grounded), but I like to be able to experiment and double-check the effect.

I wanted to try the new Tayda chrome green enclosure (and this seemed like a good project: GREEN = GROUND). It looks really cool. It does chip easily while drilling, so having Tayda predrill would be better. The interesting thing is I ended up with a bunch of cracks, which I assume is from the Epoxy drying and pulling on the finish.
 

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