Velleman projects K2570 Assembly instructions - Manual (Page 6)

6
8. PCB
Use & PCB
To use the circuit without problem, take into account
the power dissipation in the regulator.
The transformer voltage must always be 2V higher
than the maximum desired output voltage.
If, for instance, you need an output voltage of 12V,
then you need to fit a transformer of 14V.
If, as an output voltage you only need 6V, use a trans-
former having 8V and not 14V, because with an 8V
transformer the dissipation in the regulator will be of
approximately 5W when drawing a current of 1A. With
a 14V transformer, the dissipation will be higher than
10W. In the second case the regulator will die in a few
minutes.
The transformer should be connected to the points “AC
IN” and the output voltage is connected at points + and
- (Vreg).
7. Use