| ??? 08/06/05 11:10 Read: times |
#98926 - Is this allright Responding to: ???'s previous message |
Dear Kai,
Thanks for your reply and detailed explaination. I have drawn a schematic with the help of your kind suggestions. 
I intend to use the comparators inside LPC922 for Zero cross detection of Supply mains. I will use a 220V to 2.5V step down transformer for feeding the signal shown. The Vcc = 3V for the system. Resistor values I have copied from a National AppNote. I have one doubt the app note shows Vcc = 15V. Do I need to change the resistor values with my Vcc=3V or its fine. Thanks & Regards, Prahlad Purohit |
| Topic | Author | Date |
| LPC9xx Comparators and Hysterisis | 01/01/70 00:00 | |
| Feedback resistor is not enough | 01/01/70 00:00 | |
| Is this allright | 01/01/70 00:00 | |
| Tested it. | 01/01/70 00:00 | |
| calculations | 01/01/70 00:00 | |
| Re: Calculations. | 01/01/70 00:00 | |
| step down rartio | 01/01/70 00:00 | |
| Values need a change | 01/01/70 00:00 | |
| Please show the analyses | 01/01/70 00:00 | |
| Re: Value Changes. | 01/01/70 00:00 | |
| my doubt is | 01/01/70 00:00 | |
| Answers | 01/01/70 00:00 | |
| 1N914 not Zener. | 01/01/70 00:00 | |
| Silent at many places | 01/01/70 00:00 | |
| Low pass filter | 01/01/70 00:00 | |
| Answer | 01/01/70 00:00 | |
| Zero crossing detection | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 |