hi there all, i have been watching this group for a long time, and i now have a question that i hope some one can help..
I have a piece of equipment that needs a negative 48 volt power supply, dos any one have any idea how i would go about this.
Parts that i have is a transformer 50v 40A not center tap, the secondary only has 2 wires, i have a large asortmant of caps and high voltage diods and high curent diods..
But i am un shore of how to do this, the input to the telco equipment has group, common and -48v.
Thanks in advance..
Jason
I have a piece of equipment that needs a negative 48 volt power supply, dos any one have any idea how i would go about this.
Parts that i have is a transformer 50v 40A not center tap, the secondary only has 2 wires, i have a large asortmant of caps and high voltage diods and high curent diods..
But i am un shore of how to do this, the input to the telco equipment has group, common and -48v.
Thanks in advance..
Jason
What is the wall voltage in Barbados?
What is the input voltage of the transformer?
What kind of equipment are you powering?
What is the input voltage of the transformer?
What kind of equipment are you powering?
the wall voltage is 220, this input vlotage of the transformer is 210,220,230 or 240, the secondary is a 2 wire secondary no center tap, and the voltage is 50volts..
It is an ascend max modem bank.
It is an ascend max modem bank.
Probably best
to use a Texas Instruments TL783 high voltage adjustable regulator -- the transformer you are using will result in an output from the filters which will blow through an LM317HV. If you just require a "negative" voltage the "ground" becomes the positive output of the regulator.
You have to be very careful of grounds etc. when pulling a negative voltage from a positive regulator -- as all isn't as it appears!
See the TI website for details -- www.ti.com
to use a Texas Instruments TL783 high voltage adjustable regulator -- the transformer you are using will result in an output from the filters which will blow through an LM317HV. If you just require a "negative" voltage the "ground" becomes the positive output of the regulator.
You have to be very careful of grounds etc. when pulling a negative voltage from a positive regulator -- as all isn't as it appears!
See the TI website for details -- www.ti.com
the supply dos not need to be regulated.
and i do not know if you would do that easaly ether
as the equipment will draw about 20amps comstaly.
i know you are only going to use 2 diods insted of 4,
but i am not shore where to get the common signal from.
with a full wave bridge there is a + and a -
but with this there is a - where is the common (the other side)
that is where i am having my confusion.
and i do not know if you would do that easaly ether
as the equipment will draw about 20amps comstaly.
i know you are only going to use 2 diods insted of 4,
but i am not shore where to get the common signal from.
with a full wave bridge there is a + and a -
but with this there is a - where is the common (the other side)
that is where i am having my confusion.
no it is not ac, that would be a simple one then.. 🙂
and man you really mad me hope, but no dice.
it is DC
and man you really mad me hope, but no dice.
it is DC
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