Current Limiting Power Supply

This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v and has the added feature that you can limit the maximum output current. This is invaluable when, for example, you power-up a project for the first time or soak-test a piece of equipment. More: SW3 is the on/off switch. It also lets you choose between the output with the current limit and the one without. SW2 provides a selection of three different limits. You can increase or decrease this number if you wish. The limits are fixed by R4, R5.

The described power supply unit (PSU) is a versatile device designed for various applications requiring adjustable voltage and current limiting features. The PSU operates within a voltage range of approximately 3 volts to 24 volts, making it suitable for powering a wide range of electronic devices and projects.

The current limiting feature is particularly critical during initial power-up or testing phases, where excessive current draw could potentially damage sensitive components. This feature allows users to set a maximum current limit, providing an added layer of protection for both the power supply and the connected load.

The operation of the PSU is controlled by two switches: SW3 and SW2. SW3 functions as the main on/off switch, enabling or disabling the power supply. Additionally, it allows users to toggle between two output modes: one with current limiting enabled and the other without. This dual-output capability offers flexibility in usage scenarios, allowing users to choose the appropriate mode based on the requirements of their specific application.

SW2 is responsible for selecting one of three predefined current limits. This switch provides the user with the ability to customize the maximum current output according to the needs of the connected circuit. The current limits are established through the resistors R4 and R5. By adjusting these resistors, users can modify the current limit settings to suit different testing or operational requirements. This adaptability makes the PSU an invaluable tool for engineers and hobbyists alike, facilitating safe experimentation and development with various electronic circuits.

Overall, this 1-amp variable-voltage PSU combines flexibility, safety, and ease of use, making it an essential component in any electronics laboratory or workspace.This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.

SW3 is the on/off switch. It also lets you choose between the output with the current limit and the one without. SW2 provides a selection of three different limits. You can increase or decrease this number if you wish. The limits are fixed by R4, R5 & 🔗 External reference