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发表于 2015-4-5 18:58:18
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http://stinkfoot.se/archives/726
So, all Boss compact pedals made after mid 1997 use the PSA (9vDC, regulated) power supply. But what about the ACA ones made before that (the ones that still have the ACA sticker)? Do I need to buy the ACA adapter for those?
Well, you can’t… for some inexplicable reason, Boss still sells the ACA adapter, but now it is 9 volts instead of 12… so we can’t use it. You can of course modify your pedal the same way Boss did – that’s what I do, and here’s how you can do it too. But there is another way:
The daisy chain thing
When powering a Boss ACA (old-style) pedal from a 9v PSA adapter, the LED barely lights up. This is normal and expected behaviour, since the 9 volts fed to the pedal really is too little – it wants 12 volts, remember? But when the power is being provided via a daisy-chain, with other PSA pedals in the chain and signal cables connecting them, the LED suddenly lights up as normal… What happens is that all the pedals in the daisy chain share a common ground, which bypasses the voltage limiting components in the ACA pedal(s), causing the pedal to receive the full 9 volts. This trick works with any power supply where the outputs share a common ground – daisy chain setups, DC Brick etc.
Obviously, this won’t work with an isolated power supply like the Voodoo Lab Pedal Power 2, since the isolated outputs prevent common grounds from forming. This is why that power supply has a 12 volt/ACA setting.
Conclusions
If it says ”PSA” on the bottom (or on the sticker next to the adapter jack), use a 9 volt regulated supply.
If it says ”ACA” on the bottom or on the sticker, it will need 12 volts on the adapter jack, rather than 9. Unless you are using a daisy chain or power supply with common ground for all outputs (DC Brick, Cioks, PowerPad etc). In that case, the pedal will work with 9 volts, as long as there’s a ‘proper’ 9 volt pedal in the chain with it. And provided that there are signal cables connecting the pedals as well. |
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