PowerSupply. - Here is Circuit Schematic Power Supply Failure Indicator using IC LM741. Many circuits, especially digital systems such as random access memories and digital clocks, must have a continuous power supply to ensure correct operation. If the supply to a RAM is interrupted then the stored information is lost, as is the time in the case of a digital clock.
The supply failure indicator described here will sense the interruption of the power supply and will light a LED when the supply is restored, thus informing the microprocessor user that the information stored in RAM is garbage and must be re-entered, and telling the digital clock owner that his clock must be reset to the correct time.
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| Figure 1. Schematic Power Supply Failure Indicator using IC LM741 (Source: www.electronicecircuits.com) |
When the supply is initially switched on the inverting input of IC1 is held at 0.6V below positive supply by D2. Pressing the reset button takes the non-inverting input of IC1 to positive supply potential, so the output of IC1 swings high, holding the non-inverting input high even when the reset button is released. LED D1 is therefore not lit.
Component List
- R1 100kΩ
- R2 10kΩ
- R3 10kΩ
- R4 680Ω
- C1 10nF (103)
- D1 LED
- D2 1N4148
- IC1 741
- PB1 Push Button Switch
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