This is the Simple Alkaline Cell Charger Circuit Diagram. This charger works as two channel current limited voltage source 1.6 V. Low charge current allows charging deep discharged cells (0.7 - 0.8 V) and non-rechargeable cells. Charge current can be changed by R9 and R10. With 470 Ohm is approx 7 mA. LED1 and LED indicates when cell voltage reached 1.6 V and cell is fully charged.
If power supply is disconnected, reverse discharging current is negligibly (less than 1 microA). For this feature is operational amplifier type LM324 recommended or similar type with p-n-p transistor on input. Non-rechargeable cells can be charged, but their capacity will be significantly less than rechargeable cells
Parts list
| R1 | 2,2 kohm |
| R2 | 10 kohm |
| R3 | 2,7 kohm |
| R4 | 15 kohm |
| R5, R6 | 5,6 kohm |
| R7, R8 | 22 kohm (viz text) / depend on R9, R10 (approx. 50 times greater than R9, R10) |
| R9, R10 | 470 ohm (see text) / change charge current |
| R11, R12 | 1 kohm (See text) / change LEDs current |
| R13 | 1 kohm, SMD1206 |
| C1 | 100 nF, ceramic |
| D1, D2 | 1N4148 etc. |
| T1, T2 | 2SC945 etc. |
| IC1 | TL431C |
| IC2 | LM324 |
| LED1 until LED3 | Any LED 3 mm with low power consumption / any low power 3 mm LEDs |
| Housing Articles/ cell cases AA, AAA | |
| pcb bcs67 / PCB board see fig. 2 |
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