Variable Current Source

I want to design a variable current source, voltage controlled - from 0.1mA to 2.5A. Do you have any tips, circuits, etc? Many thanks! May 19, 2019 2 S. summitville Member level 3. Joined Dec 16, 2009 Messages 54 Helped 15 Reputation 30 Reaction score 14 Trophy points 1,288 Location USA

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One-transistor current source. Due to the base-emitter voltage drop of the NPN transistor, the emitter voltage is about 0.7 volts below the base voltage Vb. The emitter current, Ie, equals VeR. If Vb is variable, Ie and Ic will vary proportionally. Figure 5 also shows two possible fixed voltage sources. The one using two resistors will

I am trying to design current source of 4-20 mA variable with 24 V DC input. The circuit can read one output at a time and variable from 4 to 20 mA. When input varies between 0 and 24 volts, the current source should vary from 4 mA to 20 mA correspondingly. The input voltage will be constant somewhere between 0 and 24 volts, at any given point

An ideal current source generates a current that is independent of the voltage changes across it. An ideal current source is a mathematical model, which real devices can approach very closely. If the current through an ideal current source can be specified independently of any other variable in a circuit, it is called an independent current source. . Conversely, if the current through an ideal

I need to build a variable current source that operates off a 36V supply, if possible using a single op-amp and a mosfet. I need to control current between around 10uA - 0.5mA ie very low current. This is for some iontophoresis research I'm doing. The design I envisage is attached. The zener should give a ref voltage of 2.5V and R3 should give

Variable Current Source A current source which supplies a variable amount of current in the circuit is a variable current source. This is used when we want to vary current depending on our needs. Characteristics of Current Source. To discuss about various properties of current sources, we will enlist some characteristics of Current Sources

the current source will source current to the load to ground which allows support for different kind of applications. Current sources can be used to charge batteries, LED driving, temperature sensor biasing, and multimeters. Current sources have the benefit of having the load referenced connected directly to an independent ground.

Variable current refers to an electric current that changes in magnitude or direction over time. This type of current can be periodic, like alternating current AC, or irregular, depending on the source and application. Understanding variable current is essential in analyzing circuits, as it affects the behavior of components like resistors, capacitors, and inductors.

2.4 Current and Voltage Sources Current Sources. An independent current source is an idealized source of current that maintains a specified current through its terminals independent of the voltage across its terminals and independent of any other circuit elements connected to it.The schematic symbol for a current source is a circle with an arrow depicting the current reference direction, as shown.

Stability in a constant or variable current source is critical for accurate measurements. Analog Devices offers a range of devices that can produce flexible and reliable current sources, either integrated as in Figure 1 and Figure 2 or discrete as in Figure 3, Figure 4, Figure 5, and Figure 7 for a wide range of applications.