Circuit knowledge

This is a simple Battery charger schema diagram. A diac is used in the gate schema to provide work for the signal being applied to the gate. R1 a threshold level for firing the triac. C3 and R4 is selected to limit the maximum charging cur-provide a transient suppression network Rl, rent at full Totation of R2. R2, R3, Cl, and C2 provide a phase-shift net.