Voltage-freezer
This circuit reads and stores voltages, thereby freezing the meter reading even after the probes are removed. The operational amplifier (op-amp) is configured as a unity-gain voltage follower, with capacitor C1 located at the input to store the voltage. For improved performance, it is recommended to use an LF13741 or a TL081 op-amp instead of the 741. These two options are JFET devices and provide a significantly higher input impedance than the 741.
The circuit operates by utilizing an op-amp in a voltage follower configuration, which ensures that the output voltage closely follows the input voltage. This configuration is particularly useful in applications where it is necessary to isolate the measurement circuit from the load, thereby preventing the loading effect that can distort the readings. The capacitor C1 plays a critical role in this circuit; when the probes are connected to the voltage source, C1 charges to the input voltage level. Once the probes are removed, the charge stored in C1 maintains the voltage at the output, effectively freezing the reading on the connected meter.
The choice of op-amp is crucial for achieving optimal performance. The LF13741 and TL081 op-amps are preferred due to their JFET input stage, which provides a higher input impedance, reducing the current drawn from the voltage source and minimizing the impact on the measurement. This characteristic is particularly important when measuring high-impedance sources, as it ensures accurate voltage readings without loading the circuit under test.
In addition to the op-amp and capacitor, the circuit may include resistors for biasing and stability, as well as additional components for filtering noise or protecting against voltage spikes. Proper layout and wiring practices should be followed to minimize parasitic capacitance and inductance, which can affect the performance of the circuit. Overall, this voltage storage circuit is a practical solution for capturing and holding voltage readings in various electronic applications.This circuit reads and stores voltages, tbus freezing the meter reading even after tbe probes are removed. The op amp is configured as a unitygain voltage follower, witb C1 situated at tbe input to store tbe voltage.
For better performance, use an LF13741 or a TL081 op amp in place of tbe 741. These two are JFET devices and offer a much higher input impedance tban the 7 41. 🔗 External reference
The circuit operates by utilizing an op-amp in a voltage follower configuration, which ensures that the output voltage closely follows the input voltage. This configuration is particularly useful in applications where it is necessary to isolate the measurement circuit from the load, thereby preventing the loading effect that can distort the readings. The capacitor C1 plays a critical role in this circuit; when the probes are connected to the voltage source, C1 charges to the input voltage level. Once the probes are removed, the charge stored in C1 maintains the voltage at the output, effectively freezing the reading on the connected meter.
The choice of op-amp is crucial for achieving optimal performance. The LF13741 and TL081 op-amps are preferred due to their JFET input stage, which provides a higher input impedance, reducing the current drawn from the voltage source and minimizing the impact on the measurement. This characteristic is particularly important when measuring high-impedance sources, as it ensures accurate voltage readings without loading the circuit under test.
In addition to the op-amp and capacitor, the circuit may include resistors for biasing and stability, as well as additional components for filtering noise or protecting against voltage spikes. Proper layout and wiring practices should be followed to minimize parasitic capacitance and inductance, which can affect the performance of the circuit. Overall, this voltage storage circuit is a practical solution for capturing and holding voltage readings in various electronic applications.This circuit reads and stores voltages, tbus freezing the meter reading even after tbe probes are removed. The op amp is configured as a unitygain voltage follower, witb C1 situated at tbe input to store tbe voltage.
For better performance, use an LF13741 or a TL081 op amp in place of tbe 741. These two are JFET devices and offer a much higher input impedance tban the 7 41. 🔗 External reference
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