Electronics > Beginners
voltage
nus:
Can i use -12v as ground to get +24v out of a -12 +12 ac to dc converter
nus:
Muti meter says +24v but was wondering if that was just the difference between the two points
helius:
You can do so if there are no other ground connections in the device or anything it attaches to.
For instance, an attached device with a "capacitive dropper" line power supply is referenced to ground, and could create a short when connected to your device.
tkamiya:
You have to make sure not a single part of your power supply is connected to ground either directly or indirectly.
For example, if casing is connected to the ground prong of mains connection, and ground of your output is connected to the same level, you've just created a dead-short.
Otherwise, you can.
Your multi-meter says it is 24V because it's the difference. Voltage is just a difference - most of the time, difference from ground. But doesn't have to be that way.
nus:
So no part of what im connecting it to is going to touch ground. However there is a virtual ground in between the -12v 12v regulators. Transformer is not center taped.
Lm7812 and 7912.
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