Author Topic: Found a -24v power supply. ??  (Read 1415 times)

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Offline badjobTopic starter

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Found a -24v power supply. ??
« on: January 14, 2019, 12:41:09 am »
So I found a power supply with:
+3.3, +5, +12 and -24v

If I want to use the -24v to power a device do I hook up PS ground to the positive and then -24v to the negative? Will this work as a normal +24v power supply would have? And then using -24v with +12 or +5 would create higher voltages like 36v and 29v? I've never used negative sources and some googling seemed to imply this.   |O
 

Offline jcw0752

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Re: Found a -24v power supply. ??
« Reply #1 on: January 14, 2019, 02:39:45 am »
What you say is correct but you may be limited by the current rating of the different supplies. For example if the -24 V is rated at one amp and the + 12 V is rated at 5 amps the using them in series would provide you with 36 volts but the current would be limited to the one amp of the -24 volt source.

John
 

Offline registereduser

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Re: Found a -24v power supply. ??
« Reply #2 on: January 14, 2019, 02:58:59 am »
 

Offline badjobTopic starter

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Re: Found a -24v power supply. ??
« Reply #3 on: January 14, 2019, 05:37:58 pm »
I hooked it up and tested with dmm. +12 and -12 give 26v with no load. -24 gives 22ish volts with no load. There is no amp rating on the power supply but the model+ is 40-vp5120-PWD1X.

Hope its at least 1 or 2 A. Any way to figure that out?
 

Offline mikerj

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Re: Found a -24v power supply. ??
« Reply #4 on: January 15, 2019, 07:36:32 pm »
That PSU appears to be from an old Philips DVP3040 DVD player.  The power consumption of that device is specified at less than 10 Watts total, so it's very unlikely you will be able to pull 1 Amp out of the 24v rail.
 


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