| Low Pass Filter circuit (a) |  |
| Low Pass Filter circuit (b) |  |
| Low Pass Frequency Response |  |
| High Pass Filter circuit (c) |  |
| High Pass Filter circuit (d) |  |
| High Pass Frequency Response |  |
| Use Resistors and Capacitors at audio frequencies | |
| Use Inductors and Capacitors at radio frequencies | |
| (b) and (d) are known as Pi filters due to similarity of configuration to Greek letter π | |