# the difference between CT and Non CT transformer

the difference between CT and Non CT transformer. In the previous article the admin has explained about the understanding and function of the transformer in the electrical circuit

As you already know the transformer serves to bring up or lower the AC voltage. Step-up transformer is utilized to raise the voltage while the step down transformer is used to lower the voltage

In this article the admin will discuss about step down transformer especially about the differences between CT and Non CT transformer and how to puzzle out of CT transformer

Also read the article about creating a simple step-up transformer from step down transformer

## the difference between CT and Non CT transformer

If you pay attention to the transformer on an amplifier, then you will get 2 types of transformer is a transformer with no sign of the CT and transformer without a mark CT

### non CT transformer

non CT transformer is a mono type transformer where inside the transformer body there is no sign of CT A non CT transformer is applied for the non symmetrical power supply that is a power supply which has only positive pole and negative pole only

The feature of a non symmetrical power supply is to use only 2 pieces of cable on the output

This type of transformer has only a single coil on its secondary coil

This case of transformer commonly used for electronic circuit that only requires a power supply with 2 poles only and is used in a series of amplifiers of the former type using IT transformers and OT

In the circuit of electronically non-CT transformers are often symbolized like a picture below

### ￼CT transformer

While the CT Trafo is commonly practiced to create a full wave symmetric power supply circuit as it is mostly used for current amplifiers that use positive, neutral and negative poles

The CT transformer is marked with a CT mark as read The easiest way to know the difference between the most basic CT and a non CT transformer is to look at the CT mark as indicated above

In the electronics circuit transformer CT symbolize as follows

But keep in mind the large current coming out of the CT transformer, compared to the non CT transformer is only half

Example on 10A transformer type CT then the current will be issued is 5A while in the transformer type non CT current is issued is 10A

The above happens because the coil of the secondary transformer is divided into 2 shares with a smaller wire cross section than the non-CT transformer

For article about symmetric power supply circuit please read my article The symmetrical power supply circuit (double output)

The main use of a CT transformer is because its function is used for symmetrical power supply

Actually, for non CT transformer itself can be created into a symmetrical power supply, but only half a wave only

### how the CT transformer works

In the CT transformer there is a CT terminal or also called Center tap which serves as a neutral point against the other 2 pins (D and E)

Let’s look at the picture below Pin D and E will change from positive to negative, and then become positive again periodically

The voltage difference between pins D and E is 180 ° means that if the pin D voltage reaches the point of the sine wave (+) then the pin E voltage will be in the sine wave valve (-)

The same holds true when the voltage D reaches the valley of the sine wave (-) Then the pin E voltage will be at the top of the sine wave (+)

while for the CT pin is a neutral point between pin D and E (no change of voltage)

Similarly an article around the difference between CT and Non CT transformer. Please also read the other articles about changing the stereo input to mono. May be useful