Electronics

I am looking for a cheap (under $30) AC/DC Power Supply with the following specs:
Input: Should be in the 60Hz range and a volt range that includes 115VAC
Output 1: +12v @ A => 3A (equal to or more than 3A)
Output 2: -12v @ mA * (amout of mA doesnt matter)
Output 3: Regulated +5v @ => 1.5A
Output 4: Regulated -5v @ => mA*

I know the people into electronics are gonna say "That price is unreasonable" So some links to surplus stores or even schematics would be nice.

In case anyone feels that I don’t need these requiremens here are the main parts in the design the power supply will be used for:
1 +5 volt NE556
1 +5 volt 8Pin PIC
2 LED
1 38KHz Detector
1 highpower MOSFETS and a couple of transistors
1 +12 volt DC Motor\ Amperage req are unkown but are likely under 4 amps, as it is from a Milwakue cordless drill

So with these specs, are the two negative outputs even required? Or do I just need the two positive outputs and a GND?

Thanks in advance, sorry about the length of the question.
Geez! that Raidmax KY-550ATX Hybrid PSU is a bute! But please keep the answers comming.

As I see the compoents and the requirements of them, which the power supply is going to feed, i can clearly understand that
your
NE556 needs +5V only (and of course GND), drawing current in miliamps

similarly PIC needs +5V only (and of course GND), drawing current in miliamps

2 LED they can be fed only with +5 volt (or +12 Volt), again drawing current in miliamps

38 Khz detector, you did not give the part or details, but as I found in web it also need +ve DC bus dwaring minimal current.

1 MOSFET and transistors, again types to be known but it need not nescessary that you need a -ve bus. Think with +ve only your work will be done, if you are using it to break the power path of the motor.

MOTOR anyhow need +12 volt

so finally to answer, you CAN actully manage the situation with only the TWO +Ve and ONE GROUND. but will suggest verify the mosfet and transistor requirements.

I have some working experience with the power supplies. The price seems to be reasonable. You surely can get one in this budget, go through web to find a good deal

hope these help

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This entry was posted on Friday, May 21st, 2010 at 10:58 pm and is filed under surplus electronics. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.