voltage question

Brainbanana · 06-05-2006, 05:09 PM

Hi there,
I wonder if any of you may be able to help me?
I have a Pedalboard which includes:
Boss TU-Tuner
Homemade A/B Box
Dunlop CFH Wah
Visual Sound Jekyll & Hyde
ISP Decimator Noise Gate
Yamaha DG Stomp Multi-Effects

I am using a DC Brick Power Supply, which has seven 9-volt power jacks, and three 18 volt power jacks. I use the DC Brick 9-volt cords to power everything but the Yamaha DG Stomp. The Yamaha uses a 12 volt wall wart adapter. My question is, can I use one of the 18 volt power cords from the DC Brick to power the Yamaha DG Stomp? I need to know if it will damage the unit by doing this.

Again, the Yamah unit uses a 12 volt adapter. Can I use the 18 volt section of the DC Brick to power the Yamaha, or will that cause damage to the unit?
Anybody got any input???
Thanks-

Luijo · 06-06-2006, 05:45 AM

Most probably your DG is not capable of taking 18 volts.
But if you're handy with electronics you could build a voltage divider with a few resistors and get the 12 volts you want. Maybe something just as simple as a drop down resistor, but I like the idea of the dividing network better.
You can also use a properly rated Zener diode and you'll not only get your 12 volts but they will be regulated to boot!

Brainbanana · 06-06-2006, 01:38 PM

Hey thanks!
OK, so I posted this stuff on another board. Maybe it will help.
Uhh, I'm kind of not worth a crap at most of this terminology. I did build my own A/B Box, but that was only jacks, power, and led's. That much I can do. It does sound like I could do the step down converter thing. I would like to do away with the giant wall wart. Here is a link to the parts manual for the DG stomp. It may tell you some information that helps? I don't know.

http://www.yamaha.com/yamahavgn/Docu.../dgstomp_1.pdf

The service and parts manual

http://www.yamaha.com/yamahavgn/Docu...DG-Stomp_E.pdf

Of course, they say DON'T use any other adapter.
I think I could probably build a converter for one of the 18v spots on the DC Brick. I am a little bit lost as far as how to do it, though. Can anyone show me a parts list, and a wiring diagram for this? I am terrible at reading symbols, so if it could be in layman's terms, that would be awesome. I am mechanically inclined, and can solder halfway decent, so if I get some direction, I think I could do this.

Then someone posted this

It's 12V AC. And looking at the circuit, it's half-wave rectified to give + and - which is then regulated to give the +-15V analog rails.
You are out of luck, you will have to live with the 12v AC wart.

So, does this mean I am SOL?

I think I can make a voltage divider with some help.

If not, I am willing to pay someone to make one, if they're that easy to make, y'know? I guess I just really need to know if I can or can't fix this. The DC Brick is a regulated power supply, if that helps...

Thanks

Luijo · 06-07-2006, 09:43 AM

You forgot to mention the DG's wall wart is 12 volts AC...that's a whole different ball game!
There's no easy way out of this problem...no way to use the DC Brick (or any other single polarity power supply) for this purpose....sorry I can't be of any more help.
I guess you'll have to learn to live with the extra wall wart on your pedalboard.

Brainbanana · 06-07-2006, 04:45 PM

Thank you so much for your help my friend.
I will accept defeat, hahaha!

06-05-2006, 05:09 PM	#1
Brainbanana Junior Member Join Date: Jun 2006 Posts: 3	voltage question Hi there, I wonder if any of you may be able to help me? I have a Pedalboard which includes: Boss TU-Tuner Homemade A/B Box Dunlop CFH Wah Visual Sound Jekyll & Hyde ISP Decimator Noise Gate Yamaha DG Stomp Multi-Effects I am using a DC Brick Power Supply, which has seven 9-volt power jacks, and three 18 volt power jacks. I use the DC Brick 9-volt cords to power everything but the Yamaha DG Stomp. The Yamaha uses a 12 volt wall wart adapter. My question is, can I use one of the 18 volt power cords from the DC Brick to power the Yamaha DG Stomp? I need to know if it will damage the unit by doing this. Again, the Yamah unit uses a 12 volt adapter. Can I use the 18 volt section of the DC Brick to power the Yamaha, or will that cause damage to the unit? Anybody got any input??? Thanks-

06-06-2006, 05:45 AM	#2
Luijo Member Join Date: May 2006 Posts: 63	Don't! Most probably your DG is not capable of taking 18 volts. But if you're handy with electronics you could build a voltage divider with a few resistors and get the 12 volts you want. Maybe something just as simple as a drop down resistor, but I like the idea of the dividing network better. You can also use a properly rated Zener diode and you'll not only get your 12 volts but they will be regulated to boot!

06-07-2006, 09:43 AM	#4
Luijo Member Join Date: May 2006 Posts: 63	Too bad... You forgot to mention the DG's wall wart is 12 volts AC...that's a whole different ball game! There's no easy way out of this problem...no way to use the DC Brick (or any other single polarity power supply) for this purpose....sorry I can't be of any more help. I guess you'll have to learn to live with the extra wall wart on your pedalboard.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A question about Sunn amps	david	SUNN	10	11-18-2008 08:52 AM

06-06-2006, 01:38 PM	#3
Brainbanana Junior Member Join Date: Jun 2006 Posts: 3	Hey thanks! OK, so I posted this stuff on another board. Maybe it will help. Uhh, I'm kind of not worth a crap at most of this terminology. I did build my own A/B Box, but that was only jacks, power, and led's. That much I can do. It does sound like I could do the step down converter thing. I would like to do away with the giant wall wart. Here is a link to the parts manual for the DG stomp. It may tell you some information that helps? I don't know. http://www.yamaha.com/yamahavgn/Docu.../dgstomp_1.pdf The service and parts manual http://www.yamaha.com/yamahavgn/Docu...DG-Stomp_E.pdf Of course, they say DON'T use any other adapter. I think I could probably build a converter for one of the 18v spots on the DC Brick. I am a little bit lost as far as how to do it, though. Can anyone show me a parts list, and a wiring diagram for this? I am terrible at reading symbols, so if it could be in layman's terms, that would be awesome. I am mechanically inclined, and can solder halfway decent, so if I get some direction, I think I could do this. Then someone posted this It's 12V AC. And looking at the circuit, it's half-wave rectified to give + and - which is then regulated to give the +-15V analog rails. You are out of luck, you will have to live with the 12v AC wart. So, does this mean I am SOL? I think I can make a voltage divider with some help. If not, I am willing to pay someone to make one, if they're that easy to make, y'know? I guess I just really need to know if I can or can't fix this. The DC Brick is a regulated power supply, if that helps... Thanks

06-07-2006, 04:45 PM	#5
Brainbanana Junior Member Join Date: Jun 2006 Posts: 3	Thank you so much for your help my friend. I will accept defeat, hahaha!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)