The accuracy of the input voltage for your audio equipment can simply be set using a variac transformer. They are on 2,4,8,12,20, etc. ampere. How to choose the right one. The calculation is as follows: let's say your equipment is 500 watts and you are going to use it at a voltage of 100 volts. The choice of the correct variac model is determined by the current consumed. We divide the power by the voltage, we get the current, in our case it is 5A. Thus, the nearest model variak 8A will be the solution.
A variac as any other fixed autotransformer is capable of giving its maximum current when the tap set to the middle of the of the winding. Half current goes direct from tap to top (or viceversa depending on if it set as step up or step down) and the other half goes from bottom (lowest potential end) to tap. Any other setting of the tap used at full rated current may damage the winding wire.
Yes, you are right. Therefore, the size of the coil, the quality of the core and the quality of the winding are important, 100% copper is needed.
I know very well Variacs. I rewound the one inside this home made box. It was blown in 3 parts so I re-made it completely some decades ago.
The only issue is that I take the tap for 220V imput wrongly, so the knob operates increasing voltage counterclockise. It's not an issue becase I only use it.
Continue your business and my apologies by my meddling.
The only issue is that I take the tap for 220V imput wrongly, so the knob operates increasing voltage counterclockise. It's not an issue becase I only use it.
Continue your business and my apologies by my meddling.
