12V Battery Charge Nominal Discharge (Low) Indicator Circuit
This circuit monitors car battery voltage. It provides an indication of nominal supply voltage as well as low or high voltage.
| PARTS LIST | |
| R1 | 1.5kΩ |
| R2 | 1.5kΩ |
| R3 | 1kΩ |
| R4 | 1.5kΩ |
| R5 | 1.5kΩ |
| R6 | 10kΩ |
| R7 | 10kΩ |
| VR1 | 10kΩ Preset |
| VR2 | 10kΩ Preset |
| D1 | Green LED |
| D2 | Yellow LED |
| D3 | Red LED |
| IC1 | LM741 |
| IC2 | LM741 |
741 PIN CONFIGURATION
VR1 and VR2 adjust the point at which the red, yellow and green LEDs are on or off. For example the red LED comes on at below 10V, and the green LED at above 12V. The yellow LED is on between these values.
Circuit adjustment:
Turn both presets to ground side (anticlockwise) . Then Gives 10v to this circuit using adjustable power supply and adjust VR2 to yellow led comes on. Again gives 12v to circuit and adjust VR1 to green led comes on.
 |
 |
 |
 |
Please send your ideas, which are very important for our success…
Leave a Reply