The Electro-Harmonix S8 is a power supply with eight outputs to power eight individual guitar pedals. Seven outputs are rated at 9V DC at 250mA. The eighth output is rated at 18V DC at 150mA. Use this power brick to make sure your pedals are getting consistent current, doing so in a way that won't introduce noise into your effects chain.
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I don't own very many guitar pedals and rarely use more than 2 or 3 at any given time, so this power supply may be a bit of overkill for me. But the cheap power supply I was using didn't seem to have enough output to daisy chain more than a couple of pedals reliably. This power supply has a sturdy metal case and individual wires for each output, so you don't have a lot of extra tangled-up wiring. The 12 volt adapter is a little on the large size, but that's not really a problem for me. I'm not noticing any hum or other noise in my signal chain when using this power supply. The LED lights look pretty cool too.