| ??? 04/01/08 16:33 Read: times |
#152845 - Think about it! Responding to: ???'s previous message |
Winston Hoon said:
http://www.iguanalabs.com/sound/
I wonder how this person can make it the speaker work by just connecting a 510 ohm to the port pin directly. Think about it: What voltage will be across the combination of speaker+resistor when the port pin is high? How much current will flow? What voltage will be across the combination of speaker+resistor when the port pin is low? How much current will flow? Hint: Ohm's Law |
| Topic | Author | Date |
| driving a speaker | 01/01/70 00:00 | |
| Amplifier needed | 01/01/70 00:00 | |
| 8051 Output port drive current | 01/01/70 00:00 | |
| current | 01/01/70 00:00 | |
| Links | 01/01/70 00:00 | |
| links | 01/01/70 00:00 | |
| Think about it! | 01/01/70 00:00 | |
| speaker | 01/01/70 00:00 | |
| ... or higher-impedance speaker | 01/01/70 00:00 | |
| impedance | 01/01/70 00:00 | |
| Speakers are what they are ... | 01/01/70 00:00 | |
| impedance answer | 01/01/70 00:00 | |
| piezo | 01/01/70 00:00 | |
| The reason you're in school is to learn | 01/01/70 00:00 | |
| Library? | 01/01/70 00:00 | |
| research | 01/01/70 00:00 | |
You can use a transistor, but if you read ... | 01/01/70 00:00 |