| ??? 11/28/06 20:36 Modified: 11/28/06 22:28 Read: times |
#128635 - who can tell Responding to: ???'s previous message |
Pin numbers are meaningless when no package is stated.
a glance seems to indicate that someone believes that you can pull a lot of current when you parallel port pins - FALSE. To rely on paralelling pins for more current it would require that the Vce(sat) for all transistors was identical, just look at a datasheet for any transistor to see they are not. The net result (typically) will be that the transistor with the lowest Vce(sat) will handle most of the current and eventually give up the ghost and then another will be the one with the lowest ... and then another..... This is one of these stupid "tested" "designs" that will work when you are lucky and enough transistors are close enough. Erik |
| Topic | Author | Date |
| Unknown pinouts application | 01/01/70 00:00 | |
| who can tell | 01/01/70 00:00 | |
| i did wonder why the ports were paralleled | 01/01/70 00:00 | |
| Serial Converter | 01/01/70 00:00 | |
| more information | 01/01/70 00:00 | |
| To... | 01/01/70 00:00 | |
| Yes but | 01/01/70 00:00 | |
| Hmm... | 01/01/70 00:00 | |
| What tells the scope? | 01/01/70 00:00 | |
| Nothing | 01/01/70 00:00 | |
| Level? | 01/01/70 00:00 | |
| What will happen | 01/01/70 00:00 | |
| Improper load? | 01/01/70 00:00 | |
| Jez see this | 01/01/70 00:00 | |
| Hhm, but this paralleling is widely used! | 01/01/70 00:00 | |
| Parallel MOS transistors are fine | 01/01/70 00:00 | |
| Perfectly safe? | 01/01/70 00:00 | |
| Reasonably safe | 01/01/70 00:00 | |
| What is this circuit intended to do, Ralph? | 01/01/70 00:00 | |
| What's it to do | 01/01/70 00:00 | |
What it does | 01/01/70 00:00 | |
| Just out of interest lynn, | 01/01/70 00:00 | |
| FPGA conversion cost | 01/01/70 00:00 |