1:1:1 Transformer is outputting 1/2 the Voltage
1:1:1 Transformer is outputting 1/2 the Voltage
(OP)
Hi,
I am using a 1:1:1 transformer and I have +/- 3.25V going in and +/- 1.6V coming out. Why is this?? Shouldn't the voltage going in be the same as the voltage going out?? I have a differential op amp driving the transformer and 0 Ohm series resistors on the + and - output pins of the op amp and I have a 75 Ohm resistor across the output of the transformer.
Thanks,
swb1
I am using a 1:1:1 transformer and I have +/- 3.25V going in and +/- 1.6V coming out. Why is this?? Shouldn't the voltage going in be the same as the voltage going out?? I have a differential op amp driving the transformer and 0 Ohm series resistors on the + and - output pins of the op amp and I have a 75 Ohm resistor across the output of the transformer.
Thanks,
swb1





RE: 1:1:1 Transformer is outputting 1/2 the Voltage
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
swb1
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
swb1
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
An alternating voltage applied to a transformer causes an alternating magnetic field. This magnetic field induces EMFs in both windings. The induced voltage in the secondary winding is the open circuit terminal voltage. The induced voltage in the primary winding is the back EMF. The difference between the applied voltage and the back EMF is the voltage that drives the exciting current through the primary winding.
It will be interesting to view both applied voltage and primary current on a dual trace scope. I expect that you will see the higher frequency components of the square wave attenuated. There are too many variables that will affect the wave form of the current for me to guess at its shape, but I expect you will see a difference between the voltage trace and the current trace.
However if the two to one voltage ratio persists when you change the frequency or loading, I suspect that jimkirk is correct in suspecting a ratio error, and that your transformer has a good high frequency responce.
respectfully
RE: 1:1:1 Transformer is outputting 1/2 the Voltage
2.) Try the trafo with sine wave.
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: 1:1:1 Transformer is outputting 1/2 the Voltage