Boss DM-2 power supply

[atlas]

Can i run a Boss DM-2 whith a Boss PSA adaptor?

[Unadan]

No. ACA only. I run mine off a Voodoo Lab Pedal Power Plus - works great.

[Blakemore Effects]

Exactly what Unadan said. I run mine off my Voodoo Lab Pedal Power, but only the Boss ACA adapters will work with the DM-2. Great pedal though.

[dbx]

Check out this page...it describes the differences between the two power supplies very well. Is there something wrong with your DM-2?

http://www.stinkfoot.se/andreas/diy/articles/bossadapt.htm

[atlas]

Thanks guys!
Is the "new" Boss ACA 9V DC ok to supply the
DM-2 or do i have to get a 12V ACA DC adapter?

[VinceM]

This is very timely info for me as well. I'm borrowing a friend's DM-2 and I'm using a Godlyke daisy chain. In contrast to what is said in the link above about daisy chains, the light is still dim. However, the pedal seems to work fine.

So my question is similar to atlas: is it o.k. to run the DM-2 when it is powered this way (with a dim led)? Or is this bad for the device? Should I just run it off the battery? But then that's 9v, right?

What to do?

[VinceM]

Bump!

So is it o.k. to run a DM-2 with a Godlyke daisy chain (or PSA 9.6V adapter)? I don't care if the only issue is how bright the LED lights up. I just don't want to mess up the pedal!

[Youngpedals]

The supply for almost any analog delay depends on the supply voltage that it was calibrated with. This will ensure that the BBD gets the proper bias voltage so as to minimize distortion. This is a common issue because the bias is set with a potentiometer due to manufacturing and production variations. If the bias was set with a regulator it wouldn't be such an issue, but this is not reliable with the BBD topology. DM-2/3's were calibrated for 12VDC (ACA).

[VinceM]

Thanks Marcus for that info!

So if the DM-2 pedals are properly powered via a 9V supply (like Godlyke or Boss PSA), why did Boss specify the 12V ACA supply to be used with it?

[NB_Terry]

I've used a DM-2 for years using a one spot adapter.

I've had no problems, nor hear any difference compared to using a battery.

[Youngpedals]

The early ACA's were simply unregulated linear transformers with a bridge rectifier ("wall warts"), which were very cheap and readily available. Stinkfoot's link is very credible. Also, since a lot of DM-2's used an MN3005, the supply variation is much more forgiving (in my experience at least). Its with the MN3205 units that you begin to experience distortion from an improper bias much more easily.

[Niblos]

I have the MN3005 BBD version and the one-spot chain hums like crazy(urgh). Is it safe to grab something like this?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270522280349&ssPageName=STRK:MEWAX:IT

[atlas]

I did The daisy chain thing from a Boss PSA 9V DC and my DM-2 works perfect
the led light is shining bright:banana

[gitpa]

Pedal Power supply does not work with the Boss Dm-2. Am I doing something wrong?

[Catoogie]

Pedal Power supply does not work with the Boss Dm-2. Am I doing something wrong?

Are you plugging the one end into the pedal and the other end into an outlet?

[analogmike]

Use 12V setting on PP2 if your DM2 is ACA. See my FAQ for more info.

[gitpa]

I believe ASA power is the answer is the answer. I will try and switch the PP2 to 12v

Thanks all.

[jboyjams]

I've used a DM-2 for years using a one spot adapter.

I've had no problems, nor hear any difference compared to using a battery.
Same here - using all 8 plugs on the 1-Spot and the DM-2 is using one of them - sounds really good too.

[stinkfoot]

The DM-2 - as all the old-style ACA pedals - has a diode and resistor between the adapter jack negative and ground, to reduce the 12vDC it expects to see to around 9 volts. If you power it by itself (with its own adapter or from a separate output on a PP2+), you need to give it 12 volts. Giving it 9 volts will drop the voltage the circuit "sees" to 7 or so volts.

But if you run it from a daisy chain-type setup, where there are both power and signal cables connecting it to other pedals, it will work fine with 9 volts. The common ground setup defeats the diode and resistor, so the pedal will "see" the full 9 volts.

/Andreas

[esteban1966]

i have boss dm-2 and i recently bought a one spot daisy chain power supply but my pedal didnt work to 100% whit one spot, only works the bottons echo and intensity and the repeat rate dont oscillate, there are a really weak oscillate when i move the repeat button but at the end the signal get lose. i have several pedals plugged with the one spot. please help i dont know what else to do whit that freakin pedal. i bought the one spot with the hope that my pedal works at 100% but not. thanks i will aprecciate your help

esteban

[King Rat]

you can use a boss psa or any 9volt adapter, as long as u use a daisy chain with normal pedals and they will make it work.