X-PSU

[graphor]

Hi.. I have built a X-PSU using a Toroidal transformer. One problem I've got is that the output voltage of the transformer is not 12V but 13.7V. I have two transformers, and they all produce 13.7V even the spec says 12VAC. Is it normal or something wrong?

I remember that one of Mike's X-PSU projcet pictures shows the transformer produces exact 12V. Since capacitors in the X-Can power circuit are maximum 35V and the actual voltage inside X-can's circuit goes up to 37V, I am a little bit worried that this might burn my X-can again. Any comment would be appreciated. Thanks.

[thegreatroberto]

My X-PSU (the genuine artit.) kicks out approx.14V.
The voltage reg.will take care of that couple of extra volts.What the reg can't deal with is too few volts.So more (up to a point) is good.

As it is a transformer,it does depend on the voltage that goes onto the primary windings.If you live near a power company transformer you are more likely to be getting 245 or 250V coming into your house.

When you say the actual voltage in your can is 37V,where are you measuring this ?Normally (as I have discovered) caps are usually rated approx.2 times the max volts they are likely to see....................Most caps die from heat.However that heat could be as a direct result of overvoltage.

[graphor]

X-can's internal PSU circuit actually produces 30V DC and it does not seem to be done by a voltage regulator (but by a voltage amplifier circuit.. corerct me if I am wrong). I check this voltage and mine produces 37V which is about 7V higher than it supposed to be, but all internal caps have max 35V spec.

[thegreatroberto]

is this a V1,V2 or V3 ?

[graphor]

I am talking about v2 but v1 also produce +-30V as well as +-15V internally (in addition to 15V AC for tube heater)