Null-detector
In this indicating comparator circuit, R2 sets the hysteresis. If the 741 saturates at ±12 V, the current in R1 will be approximately ±10 mA if a 0.1 V hysteresis is desired. More: Then 0.1 V/10 mA ~ 100.
The indicating comparator circuit utilizes a standard operational amplifier, specifically the 741 model, which is configured to operate with hysteresis. Hysteresis is a critical feature in comparator circuits that helps prevent oscillation or noise from causing false triggering at the output. In this configuration, resistor R2 is responsible for establishing the hysteresis level, impacting the switching thresholds of the comparator.
When the 741 op-amp is powered with a supply voltage of ±12 V, it operates within this range to provide stable output levels. The current flowing through resistor R1 is approximately ±10 mA when a hysteresis of 0.1 V is set. This relationship can be expressed mathematically, where the voltage across R1 divided by the current through it yields the resistance value. Thus, with a desired hysteresis of 0.1 V and a current of 10 mA, the resistance R1 can be calculated as follows:
R1 = 0.1 V / 10 mA = 10 Ω.
This indicates that R1 should be approximately 10 ohms to achieve the specified hysteresis level. The design of this circuit is essential for applications requiring precise voltage level detection, ensuring that the output state remains stable despite small variations in the input signal. The careful selection of resistor values and the operational amplifier's characteristics are crucial for the effective performance of the circuit in various electronic applications.In this indicating comparator circuit, R2 sets the hysteresis. If the 741 saturates at ± 12 V, the current in R1 will be approximately ± 10 mA if 0.1 V hysteresis is desired. Then 0.1 V/10 mA ~ 100 🔗 External reference
The indicating comparator circuit utilizes a standard operational amplifier, specifically the 741 model, which is configured to operate with hysteresis. Hysteresis is a critical feature in comparator circuits that helps prevent oscillation or noise from causing false triggering at the output. In this configuration, resistor R2 is responsible for establishing the hysteresis level, impacting the switching thresholds of the comparator.
When the 741 op-amp is powered with a supply voltage of ±12 V, it operates within this range to provide stable output levels. The current flowing through resistor R1 is approximately ±10 mA when a hysteresis of 0.1 V is set. This relationship can be expressed mathematically, where the voltage across R1 divided by the current through it yields the resistance value. Thus, with a desired hysteresis of 0.1 V and a current of 10 mA, the resistance R1 can be calculated as follows:
R1 = 0.1 V / 10 mA = 10 Ω.
This indicates that R1 should be approximately 10 ohms to achieve the specified hysteresis level. The design of this circuit is essential for applications requiring precise voltage level detection, ensuring that the output state remains stable despite small variations in the input signal. The careful selection of resistor values and the operational amplifier's characteristics are crucial for the effective performance of the circuit in various electronic applications.In this indicating comparator circuit, R2 sets the hysteresis. If the 741 saturates at ± 12 V, the current in R1 will be approximately ± 10 mA if 0.1 V hysteresis is desired. Then 0.1 V/10 mA ~ 100 🔗 External reference