| ??? 10/23/08 16:04 Read: times |
#159287 - Datasheet? Responding to: ???'s previous message |
The transistor will "short" when it detects light. But you don't want a short circuit. So you must have a resistor in series with the photo transistor, to limit the current sent through the transistor.
Besides having a resistor to limit the current, you also have to make sure that you use the correct pins and with the correct polarity. In the Fairchild data sheet for the L14F1 transistor (you have the data sheet don't you?), there is a sample schematic "Figure 5. Test Circuit and Voltage Waveforms" that should give you a hint at how the transistor may be connected. It is also possible to move the resistor from the negative side of the transistor (the emitter) to the positive side (the collector). |
| Topic | Author | Date |
| tachometer | 01/01/70 00:00 | |
| schematic, please | 01/01/70 00:00 | |
| Datasheet? | 01/01/70 00:00 | |
| reply to tachometer | 01/01/70 00:00 | |
| Resistor to processor too. | 01/01/70 00:00 | |
| the schematic is | 01/01/70 00:00 | |
| Limitation of base current to 2N2222? | 01/01/70 00:00 | |
| in effect | 01/01/70 00:00 | |
| another option | 01/01/70 00:00 | |
| What is your part in this assignment? | 01/01/70 00:00 | |
| thanks | 01/01/70 00:00 | |
| Don't panic | 01/01/70 00:00 | |
| RE: dont have enough knowledge on microcontrollers | 01/01/70 00:00 | |
| CODE | 01/01/70 00:00 | |
| expecting a reply now | 01/01/70 00:00 | |
| Not BCD! | 01/01/70 00:00 | |
| how to solve? | 01/01/70 00:00 | |
| your task | 01/01/70 00:00 | |
| trying!! | 01/01/70 00:00 | |
| not found !!!! | 01/01/70 00:00 | |
| Trivial solution: compare/subtract | 01/01/70 00:00 | |
| thanks a lot!!! | 01/01/70 00:00 | |
| google or paper and pen | 01/01/70 00:00 | |
| something weird | 01/01/70 00:00 | |
| treading dangerous waters | 01/01/70 00:00 | |
Nothing weird | 01/01/70 00:00 |