| ??? 08/11/06 13:12 Modified: 08/11/06 13:50 Read: times |
#122039 - elementary, my dear Watson Responding to: ???'s previous message |
The capacitor is charged to "5 V over the other end of the capacitor". Since the innards of the chip may depend on that it may be that the result is no 5V over ground, but something else.
Read a bit about "charge punps" you will find some discrete designs that illustrate the function nicely. I recall once using a discrete charge pump to produce 10mA. Another 'nugget': if you have a fairly frugal OP amp in a non critical application a MAX232 will nicely provide + and - volts to supply it. Erik |
| Topic | Author | Date |
| MAX232-alike pin 2 capacitor | 01/01/70 00:00 | |
| elementary, my dear Watson | 01/01/70 00:00 | |
| not so quickly, Holmes | 01/01/70 00:00 | |
| Oi. | 01/01/70 00:00 | |
| I sure can | 01/01/70 00:00 | |
| cheating IS allowed | 01/01/70 00:00 | |
| Jan please edit to this | 01/01/70 00:00 | |
| talking about cheating | 01/01/70 00:00 | |
| Erik, you\'re going to regret having said that ... | 01/01/70 00:00 | |
| I have done it for "is it there" | 01/01/70 00:00 | |
| Jan, that\'s been in the datasheet since day 1 | 01/01/70 00:00 | |
| that was not max | 01/01/70 00:00 | |
| You really do need to read the materials | 01/01/70 00:00 | |
| OK, I will behave :-) | 01/01/70 00:00 | |
| Different charge pumping methodes | 01/01/70 00:00 | |
| misleading | 01/01/70 00:00 | |
| Sure? | 01/01/70 00:00 | |
| sure. | 01/01/70 00:00 | |
Was a typo | 01/01/70 00:00 |