| ??? 11/20/05 19:22 Modified: 11/20/05 19:24 Read: times |
#103929 - Battery Backup Trouble! |
Hi all members
I want to have a battery backup in my circuit it must be charged when needed and when power fails it must supplies the board also the system must allarmed the user when battery is disconnected! In my circuit i have used a 7.5 volt diode zener and a 7414 schmitt trigger! and with 3 diodes both autocharging and battery backup mode works proper! bust i can't find when battery is disconnected because my 7812 regulator goes through d5 and d3 and it never alarms the system 
Can any one correctme please! Thanks Beforehand Reza |
| Topic | Author | Date |
| Battery Backup Trouble! | 01/01/70 00:00 | |
| a suggestion | 01/01/70 00:00 | |
| Suggestion may not work | 01/01/70 00:00 | |
| Simple, or simplistic? | 01/01/70 00:00 | |
| and it will state "no battery" when one | 01/01/70 00:00 | |
| Sorry | 01/01/70 00:00 | |
| Some more details please | 01/01/70 00:00 | |
| Use a proper Supervisor | 01/01/70 00:00 | |
| More Details! | 01/01/70 00:00 | |
| Put a CMOS transistor in series with | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| What battery do you use? | 01/01/70 00:00 | |
| 8*1.5(NI-CD)! | 01/01/70 00:00 | |
| NI-CD is 1.2*N | 01/01/70 00:00 | |
| But when is full it is more than 1.2v | 01/01/70 00:00 | |
| Kai,when you say your idea? | 01/01/70 00:00 | |
| Now... | 01/01/70 00:00 | |
| Thanks Dear Kai, | 01/01/70 00:00 | |
| How it works... | 01/01/70 00:00 | |
| Your Time is for all of us,Kai | 01/01/70 00:00 | |
I would prefer the Pb-battery | 01/01/70 00:00 | |
| A/D? | 01/01/70 00:00 |