So related to my other thread.

I have to connect +V and -V (and ground) to a circuit (An amplifier)
so I suppose I need a Dual Polarity Power Supply.

Pardon my ignorance but... do they sell this? or it has to be built?

a clarification on this concept will be very much appreciated.

Kansai

 

Kansai,
You can either buy or build a dual rail supply.

You can spend a great deal of money on one off-the-shelf that will suit most of your needs for a good while, or you can build a "n00b" version that will suit your needs for a short while at least - and may indeed prove useful for a long time to come.

First, define your needs. Then start asking questions. Be realistic. If you want much more than 1/2 Ampere at much over 15v, you will have quite a challenge. Less will get you going much more quickly.

 

A quick one is to take a computer power supply. Most have + - at 12 volts, moderate current. Google or look on instructables.

 

thanks.

My needs... well that is kind of difficult as well since I dont understand the circuit. I want an output of ±10 V in the circuit so I guess I will provide ±10 V to it...so

basically a power source of +10 ground and -10v. If I can have one additional output of 12V that would be great.

the circuit that i will be using this power source on is below

the iC is Kyowa HSC-20BS ( a signal conditioner)

http://www.kyowa-ei.co.jp/product/acquisition/keiso/hsc_bs.html

(I am sorry there is no english homepage for this)

 

It is a long way from finished, but...

http://forum.allaboutcircuits.com/showthread.php?t=33444

 

Kansai,
Google "ATX Bench Power Supply" for lots of ideas on converting an ATX form factor computer power supply to a bench power supply. It is probably the least expensive and quickest way to get what you want.

I converted an old Compaq 250W supply to a bench supply. It has +12v @ 8A, -12V @ 0.8A, +5V, -5V, +3.3V. You have to use a power resistor to place a load on the 5V supply or you wont get proper regulation on the 12v supplies.