1. Semiconductor Devices I Filters Benchmark Companies Inc PO Box 473768 Aurora CO 80047

2. Time constant TAU = RC And 5xRC = the DISCHARGE time for the circuit. As RC changes the rate of discharge increases causing the ripple voltage value to be less Rectifier Circuit Regulator Circuit Filter Circuit

3. Time constant TAU = RC The variations in capacitor voltage levels (high to low) is called the Ripple Voltage. Rectifier Circuit Regulator Circuit Filter Circuit

4. Time constant TAU = RC The smaller the Ripple Voltage, the better the filter. Rectifier Circuit Regulator Circuit Filter Circuit

5. Time constant TAU = RC Filters are said to be satisfactory with a ripple voltage of no more than 3% of the DC voltage Rectifier Circuit Regulator Circuit Filter Circuit

6. The diode in this circuit allows only half cycles to pass. The value of the capacitor is too small to change the waveform. Half wave Rectifier Circuit with Capacitor =.001uF

7. Half wave Rectifier Circuit with Capacitor =.01uF As the Capacitor is increased 10 times the previous, We begin to see the affects of the time constant (RC).

8. Half wave Rectifier Circuit with Capacitor =.1uF As the capacitance is increased again, the discharge delay becomes more evident.

9. Half wave Rectifier Circuit with Capacitor = 1uF As capacitance increases another 10 times the previous, DC voltage Voltage levels increase, and the ripple voltage level decreases.

10. Half wave Rectifier Circuit with Capacitor = 10uF Soon the ripple voltage is negligible. The capacitor’s size may become an issue.

11. Half wave Rectifier Circuit with Capacitor = 100uF At this point, DC is predominant and ripple voltage is considered negligible.

12. End of Presentation