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Electronics Forum / Basics / October 2006Lowering PS from 15 VDV to 12VDC
I finally found out the power supply requirements of my ITS 2000S. It is +12VDC, -12VDC, +5VDC. I found a PS that is close but puts out 15VAC and -15VDC and 5 VDC. If I want to lower this 15 V down to 12 how would I do this? Just put a resistor in line with it? Is it that smiple? Can someone walk me through this so I don't fry this thing. Once more thank you. Russ > I finally found out the power supply requirements of my ITS 2000S. It > is +12VDC, -12VDC, +5VDC. [quoted text clipped - 5 lines] > Once more thank you. > Russ Those are standard computer PSU voltages !  SignatureBaron: > I finally found out the power supply requirements of my ITS 2000S. It > is +12VDC, -12VDC, +5VDC. [quoted text clipped - 4 lines] > Once more thank you. > Russ If the supply is regulated, you might find the voltage divider that measures the output voltage against a reference and provides the feedback that sets the output. Changing the appropriate resistor might change the + and - 15 to + and - 12, but it may also lower the 5 volts to 5*12/15=4 volts. A safer approach would be to add LM7812 and LM7912 linear regulators to the 15 volt outputs to waste the extra 3 volts from each. Here are the data sheets that show how to hook them up and the additional parts that are recommended. http://www.fairchildsemi.com/ds/LM/LM7812.pdf http://info.hobbyengineering.com/specs/FAIRCHILD_LM79XX.pdf These parts are common as dirt and very cheap. If you load them with anything near their 1 amp capability, you will also have to mount them on heat sinks to keep them from overheating. Changing > the appropriate resistor might change the + and - 15 to + > and - 12, but it may also lower the 5 volts to 5*12/15=4 Yes, there is a variable resistor on the thing but it lowers the 5 volts also. I tried a computer powersupply but there were so many lines on it and I think it needs a load so it wasn't as easy to work with. I found this PS from a an extra DSL modem so that is what I am trying to work with. Or I could just buy the correct one. Well, either way now I know. thanks Russ > Changing >> the appropriate resistor might change the + and - 15 to + [quoted text clipped - 4 lines] > lines on it and I think it needs a load so it wasn't as easy to work > with. (snip) Usually, only the 5 volt supply requires a minimum load. A 12 volt brake light is probably enough. > I finally found out the power supply requirements of my ITS 2000S. I see no link from this message to wherever that's mentioned... > It is +12VDC, -12VDC, +5VDC. I found a PS that is close but puts out > 15VAC and -15VDC and 5 VDC. is there a reason why a regular PC powersupply is unsuitable that'll get yoy +5VDC and +12VDC at a number of amps and -12VDC at a few hundered miliamps. sure it's possible to get +/- 12V from the one you describe but you'd be going half-way to building your own powersupply. SignatureBye. Jasen I see no link from this message to wherever that's mentioned... Yes, I just wasn't 100% sure about the voltages so I sat at the computer for hours and I found this old SEC filing for the ITS company that was 200 pages long and as I read through the thing and I came across a name of a company that bought the first demo unit that I recognized. So I called them and they managed to dig the unit up and read me the PS requirements. They paid $6K for it in 1999. They are selling something similiar at www.curvetrace.com A BK Proline PL 5030 and it is a good deal. I bought two of those. The only differnce between the ITS one and this one is the ITS has better software. I am going to try a Computer power supply tomorrow. The DSL PS won't workout. Not enough amps. > I finally found out the power supply requirements of my ITS 2000S. It > is +12VDC, -12VDC, +5VDC. What sort of amps? http://tinyurl.com/pxmu8 Put it in a case. |
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