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STD 12v Lead Acid Battery Backup Circuit
License: CC-BY-SA 3.0
Mode: Editors' pick
- 1
Update time：
2021-06-26 08:46:40
Creation time：
2018-08-16 21:13:49
Description
Battery backup circuit for a 12v lead acid battery with a LM317 for an additional 9v output
Video on how you can build it:
[https://youtu.be/Ga5kFAkoAoQ](https://youtu.be/Ga5kFAkoAoQ)
Design Drawing
schematic diagram
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| ID | Name | Designator | Footprint | Quantity | Mounted | |
|---|---|---|---|---|---|---|
| 1 | Input | J1 | H2-5.0-10.5X8.0MM | 1 | Yes | |
| 2 | Battery | J2 | H2-5.0-10.5X8.0MM | 1 | Yes | |
| 3 | 12v output | J3 | H2-5.0-10.5X8.0MM | 1 | Yes | |
| 4 | 9v Output | J4 | H2-5.0-10.5X8.0MM | 1 | Yes | |
| 5 | 1N4007 | D1,D2 | DO-41 | 2 | Yes | C84641 |
| 6 | 1k | R1 | THRU030 | 1 | Yes | |
| 7 | 2.2k | R3 | THRU030 | 1 | Yes | |
| 8 | LM317T-DG | U1 | TO-220(TO-220-3) | 1 | Yes | C18718 |
| 9 | 360 | R2 | THRU030 | 1 | Yes |
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