A mini-drill machine is
always needed in drilling the printed circuit board. It is usually
powered by batteries that limit the drill’s capacity.Using a power
supply adaptor with a speed regulator like the one featured here can
certainly improve the performance of the drill.
The speed regulator can maintain the speed of the drill no matter
what load is encountered by the drill.Potentiometer P2 controls the
speed of the mini-drill. P1 sets the maximum voltage allowed by the
Caution! Danger of electrocution!
Extreme shock hazard. You are working a line voltage of 220 Volts AC.