Voltage Transformer help. Regarding a project.?

Question

Hey there I am working on a project for guitar amplifier. So project requires 25-0-25 step down transformer. What is this. I mean how will it output voltage. Would 25+ and -25, +25 and 0 or something that will result total pd of 25. Well testing my circuit in software simulation so i required help for it..I am beginner in electronic (Science student of A-levels).

Here is the description of project regarding transformers. I am bit confuse about output 25-0-25 transformer but +/-35 output.?

The amplifier is designed for a maximum loaded supply voltage of +/-35V, and this must not be exceeded. Normal tolerance for mains variations is +/-10%, and this is allowed for. The transformer must be rated for a nominal 25-0-25 volt output, and no more.

Answer 1

You can use this transformer in two ways. Either providing a single supply voltage or providing a bipolar supply (+&-). You might use a bridge rectifier either way. If you use the bi-polar bridge, the output voltage (using a capacitor input filter) will be: +&-38.9v (i.e. 25+10% * sqrt2). This voltage will drop on load.

Answer 2

I think they are talking about a center tapped transformer.  Sort of two transformers put together.  So you will get voltages referenced to the center tap of 25 and -25 volts.

Answer 3

Pas is correct. Another way to express the transformer is 50 volts CT (center tapped).

Commonly used for DC supplies. Two diodes and a capacitor will give you about +35 volts DC. Two more diodes and another cap will get -35 volts DC.

http://www.geofex.com/Article_Folders/Po...

This has a schematic, look halfway down the page for a drawing labeled "Raw supply for regulators, bipolar.

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