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Design help needed

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andrej33

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Brand new to your forum. Need help with a project. I am a musician and I am building a new rack for my synth gear. I need to save space and weight, so I would like to limit the transformers in my rack. I was thinking of having one 12 volt DC transformer power the top 4 and have a strip with + and - feeds on them and go to each device with the appropriate resistor and or voltage regulator on the feeds to step down the voltage. Am I thinking correctly? This is what I have in the rack:

Yamaha VL-70 Center Polarity + 12V DC 700 mA
Senheiser mic Center Polarity + 12V DC 300 mA
Roland JV-1010 Center Polarity - 9V DC 1000 mA
WIDI wireless Center Polarity + 5V DC Doesn’t say how many mA, but it also runs on 2 AA Batteries.

Alesis Nano Verb 5VA AC Obviously will need it's own transformer.



Would appreciate any suggestions.
Thanks!
Andre
 
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Roland JV-1010 Center - 9V DC 1000 mA

That uses negative 9 volts?

Ron
 
Hi Ron,
No, the polarity of the device has negative at the center vs positive on all the other DC devices.
 
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OK, I see what you are saying. You have a collection of wall warts (small transformers providing mostly DC voltages) to your devices. You would like to eliminate all the little units and have a single power supply deliver power to as many devices as possible.

You could build a single supply that could do that but it would take a small amount of doing and some parts. Most of the parts could be easily had if that is what you have in mind.

Ron
 
OK, I see what you are saying. You have a collection of wall warts (small transformers providing mostly DC voltages) to your devices. You would like to eliminate all the little units and have a single power supply deliver power to as many devices as possible.

You could build a single supply that could do that but it would take a small amount of doing and some parts. Most of the parts could be easily had if that is what you have in mind.

Ron

Hi ron,
Yes that is what I would like to do. I was thinking of having one 12 volt transformer power the top 4 and have a strip with + and - feeds on them and go to each device with the appropriate resistor and or voltage regulator on the feeds to step down the voltage. Am I thinking correctly?
 
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Hi ron,
Yes that is what I would like to do. I was thinking of having one 12 volt transformer power the top 4 and have a strip with + and - feeds on them and go to each device with the appropriate resistor and or voltage regulator on the feeds to step down the voltage. Am I thinking correctly?

Actually you have a few options and the first and simple route may be to go and buy a reasonable priced home computer power supply. With a few simple hacks easily done that will give you all the 12 volt and 5 volt power you will ever need. A cheap PSU (Power Supply Unit) can be had for about $29 USD. Minor problem with the 9 volts but not a big one. You need a LM7809 which is a 9 volt regulator from an electronic supply source. You run the 7809 off the 12 volts and you will have the 9 volts you need. A few .1 uF capacitors and maybe a 250 uF 25 volt cap and that would be about it. Rough guess about $40 USD and you are there.

Option 2 would be to build a power supply which would be more difficult and cost more.

Ron
 
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