| ??? 04/29/06 03:22 Modified: 04/29/06 03:23 Read: times |
#115222 - Please! Responding to: ???'s previous message |
Suresh said:
Here i saw the output of U4B(ramp+-) is being used for measuring PI,DO of FormB. What the hell means PI, DO?? The "manual" also mentions "CR", "VCR", "VPI", "VDO" and "HY". What do these mean???? Why using all these stupid abbreviations instead of concrete descriptions??? This manual is a shit! Suresh said:
I found that the DAC being the current o/p one, delivers .2777A when the input data are all logic 'high'.
So, the voltage at the output of LM412(U4A)pin 1 = Vo = .2777 * 33 = 9.1641 V NO, NO, NO! As explained in the datasheet the DAC works together with the LF412 and fabricates a voltage of 0V at "0000 0000 0000" and -5V x 4095/4096 = -4.9988V at "1111 1111 1111". And as I tried to tell you in my last post: THE LF412 OUTPUTS A NEGATIVE VOLTAGE, WHICH MAKES NO SENSE AT ALL!!! So, again: There's definitely a mistake in your schematic!!!! Try to find this mistake before continuing this discussion! Suresh, all this discussion makes no sense, if you don't have a look into the datasheets of used chips! PLEASE! Kai |
| Topic | Author | Date |
| Circuit Analysis | 01/01/70 00:00 | |
| it might be easier to help if we knew | 01/01/70 00:00 | |
| Reply | 01/01/70 00:00 | |
| last time | 01/01/70 00:00 | |
| I second that | 01/01/70 00:00 | |
| Erik, This is not the only work iam carr | 01/01/70 00:00 | |
| comments | 01/01/70 00:00 | |
| It amazes me | 01/01/70 00:00 | |
| old soldiers never die | 01/01/70 00:00 | |
| Sorry, mine has an electron gun! | 01/01/70 00:00 | |
| son of a(n electronic) gun | 01/01/70 00:00 | |
| Exactly. Its what iam trying ... | 01/01/70 00:00 | |
| HUH? | 01/01/70 00:00 | |
| LM412 source current for a particular .. | 01/01/70 00:00 | |
| Zilch | 01/01/70 00:00 | |
| The basics..... | 01/01/70 00:00 | |
| Reply to :comments | 01/01/70 00:00 | |
| Reverse engeering?? | 01/01/70 00:00 | |
| Let me give all the informations i have | 01/01/70 00:00 | |
| Well, I wasted my time then! | 01/01/70 00:00 | |
| Faulty design? | 01/01/70 00:00 | |
| Thanks and few more.... | 01/01/70 00:00 | |
| Please! | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| When "inheriting" a complex design, you | 01/01/70 00:00 | |
and sometimes ... | 01/01/70 00:00 |