| ??? 03/16/12 12:38 Modified: 03/16/12 12:42 Read: times |
#186725 - So, you need to make -15V, 0V and +15V? Responding to: ???'s previous message |
Hy Mehdi, how are you?
How precise must these voltages be fabricated? What load has to be driven by these voltages? How fast must the signal settle after a change? Your scheme is good but will only work, if both outputs have push-pull-stages, which the standard 8052 does not provide. So, you might need to use two separate 74HCMOS inverters for that job, like in the 74HC04 e.g. If the voltages have to be fabricated precisely you should increase the both resistors (R9) a bit because of the unwanted voltage drops within the inverters. Or take some inverters in parallel. If the signal has to drive a heavy load you could use the L165 or similar as driver. Kai Klaas |
| Topic | Author | Date |
| Making a pulse with 3 different voltage level! | 01/01/70 00:00 | |
| No best but consider a voltage divider | 01/01/70 00:00 | |
| derivative with a DAC? | 01/01/70 00:00 | |
| derivative with configurable ports | 01/01/70 00:00 | |
| Thanks Per And Erik | 01/01/70 00:00 | |
| which derivative | 01/01/70 00:00 | |
| with an OPamp | 01/01/70 00:00 | |
| Thanks Erik | 01/01/70 00:00 | |
| So, you need to make -15V, 0V and +15V? | 01/01/70 00:00 | |
| Hi Dear Kai | 01/01/70 00:00 | |
| 74hc series | 01/01/70 00:00 | |
FPGA | 01/01/70 00:00 | |
| I think you can do it wih one resistor. | 01/01/70 00:00 | |
| Most 8051 Systems????? | 01/01/70 00:00 | |
| Well add a pull-up resistor then | 01/01/70 00:00 | |
| Would prefer to not have to match internal resistors | 01/01/70 00:00 | |
| You cannot match the weak internal active pull-up! | 01/01/70 00:00 | |
| Being pedantic. | 01/01/70 00:00 | |
| Hi David | 01/01/70 00:00 | |
| maybe a couple of mosfets ... | 01/01/70 00:00 | |
| Thanks Richard | 01/01/70 00:00 |