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STD Simple, cheap and IC free float battery charger.
Simple, cheap and IC free float battery charger.
License
TAPR Open Hardware License
License: TAPR Open Hardware LicenseMode:
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Update time：
2022-12-22 15:09:17
Creation time：
2022-12-21 12:06:08
Description
Description
Made to be easy, simple and straightforward, this module will control the charge of a car or lithium battery, just adjust the maximum charge by the multiturn trimpot. Once the maximum voltage is reached, the charging is cut off and approximately 2.5V (hysteresis) below the maximum voltage it will resume charging.
Design Drawing
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 470uF | C1 | CAP-D10.0×F5.0 | 1 |
| 2 | 1N4148 | D1 | DO-35_BD2.0-L4.0-P8.00-D0.5-FD | 1 |
| 3 | Floating LED | NO1 | LED-TH-3MM | 1 |
| 4 | VCC IN | P1 | CONN-TH_2P-P5.08_JL500-50002G01 | 1 |
| 5 | BATT OUT | P2 | CONN-TH_2P-P5.08_JL500-50002G01 | 1 |
| 6 | BC548B | Q1 | TO-92-3_L4.9-W3.7-P1.27-L | 1 |
| 7 | 200kΩ | R1 | RES-ADJ-TH_3296W | 1 |
| 8 | 1k | R2 | R_AXIAL-0.3 | 1 |
| 9 | 10k | R3 | R_AXIAL-0.3 | 1 |
| 10 | RELAY | U2 | RELAY-TH_RELAY-SPST | 1 |
| 11 | 1N4739A | ZD1 | DO-41_BD2.8-L4.2-P8.00-D0.7-FD | 1 |
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