Clockwise from the power supply are: my Akai Uni-Bass and Deep Impact pedals (no, they are not for sale!), my modified Ibanez compressor, my active ABY Box, and my EBS Chorus pedal. Thank god for velcro, because I often change the lineup. |
Pedal Board Power Supply |
Pedal Board Power Supply |
The ideal power supply for a pedal board has an indiviual supply for each effect pedal. This is to eliminate the chance of earth loops causing hum. In practice, you can usually get away with one or two 9 volt supplies for the typical board of half a dozen pedals or so. (Provided the polarity, and the current and voltage ratings are appropriate, of course.) Until I built this unit on the left, I used to make sure I had batteries in all my pedals, and simply disconnected the DC supply to any that seemed to be humming a little more than they should be at the sound check. The circuit is basic stuff - a rectifier, a fixed reg, and a couple of caps on each secondary. These particular PCB mount toroidal transformers not only have two secondaries (to give me a total of 4 isolated 180mA outputs), but they have two primaries, so I was able to put a series-parallel switch inside for a choice of mains voltages. (Great for touring.) Also the transformers are only 20mm high, so I was able to use the "double-decker" approach with two circuit boards and save a lot of pedal board space. I also like these IEC connectors with the integrated fuse. The drawer part that holds the fuse actually has a little space to keep a spare fuse - very cool. |
Clockwise from the power supply are: my Akai Uni-Bass and Deep Impact pedals (no, they are not for sale!), my modified Ibanez compressor, my active ABY Box, and my EBS Chorus pedal. Thank god for velcro, because I often change the lineup. |
