Voltage regulator PCB kit H-TRONIC for LM317-T output 1.2–32 V DC (kit without regulator)

PCB kit by H-TRONIC designed to implement an adjustable LM317-T based voltage regulator with an output range of 1.2–32 V DC. The board is supplied as a kit without the LM317 regulator and provides a compact layout with pads for the regulator in TO-220 format, a trim potentiometer footprint for setting the output voltage, mounting holes and clearly labelled input, output and adjust connections. The kit includes a detailed assembly manual and is intended for electronics assembly, prototyping and power supply projects that require a manually adjustable DC output.

Advantages

The printed circuit board offers a ready-made layout for a proven LM317 regulator circuit, reducing time spent on designing and etching custom PCBs. Clear silk-screen labels and dedicated pads simplify component placement and soldering, while the trim potentiometer footprint enables fine adjustment of the output voltage between 1.2 and 32 V DC. Mounting holes make it easy to secure the board in enclosures or test rigs. As the regulator is not included, you can select the exact LM317-T device and thermal mounting method suitable for your application.

Suitable for

• Building adjustable bench power supplies for electronics testing
• Prototyping circuits that require a variable DC voltage source
• Repair or upgrade of existing equipment using LM317-based regulation
• Educational projects and hands-on learning about linear voltage regulators

Key specifications

• Output voltage range: 1.2–32 V DC
• Maximum recommended input voltage: up to 25 V AC (observe regulator limits)
• Regulator footprint: TO-220 package (LM317-T compatible)
• Board dimensions: approximately 50 mm (length) × 31 mm (width)
• Includes pads for trim potentiometer, input/output/adjust terminals and mounting holes
• Supplied as a kit without the LM317 regulator; assembly manual included

How to use

Assemble components on the PCB following the supplied manual: solder the trim potentiometer, terminal connectors and any required capacitors or resistors specified in the assembly instructions. Mount the LM317-T regulator into the TO-220 footprint and, if necessary, attach an appropriate heatsink using the board’s mounting provision and insulating hardware if isolation is required. Apply input voltage within the specified limits, adjust the trim potentiometer to set the desired output voltage, and verify the output with a multimeter before connecting sensitive loads.

Recommendations

Use an LM317-T regulator rated for the expected input-output voltage differential and load current, and provide adequate heat dissipation. Observe correct polarity and grounding when connecting the input and output. Follow the assembly manual for recommended capacitor placement to ensure regulator stability. For persistent or high-power loads, choose a regulator with suitable thermal characteristics and mount it on a heatsink; consider fusing the input for added protection.