Next thing we need to know is the pinout of our main components. The voltage regulator is packaged in a standard TO-92 package. This is the same package used for many transistors. As long as Vin on pin 3 is greater than 7 volts DC (with respect to ground), it will put out a regulated 5 volts DC on pin 1 (Vo). This chip can supply up to 100 milliamps of current (1 tenth of an amp.) One side of the Hall effect sensor has beveled edges and has the brand and part number etched into it. It is this branded side where the measurements are taken. We need to keep that in mind when we design the instrument.