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Ten green rectangular circuit boards with adjustable voltage regulators and solder points

Vszerda

Vszerda LM337 Adjustable Power Supply Module XR-103 10Pcs

SKU CH-8F8H-2WASD

Pack of ten adjustable modules delivering ±1.25 V to 30 V at 1.5 A with short-circuit and thermal protection

  • ±DC 1.25V to 30V adjustable output for flexible prototyping
  • Guaranteed 1.5A output current powers demanding circuits
  • 01% line regulation keeps voltage stable under supply changes
  • 80dB ripple rejection delivers clean power for sensitive components
  • circuit, overcurrent and overheating protection safeguards your build

LM337 Adjustable Regulator Module

The Vszerda XR-103 is a dual-polarity linear regulator board built around the LM337 and its positive counterpart. Each module accepts a centre-tapped AC input up to 28 V and delivers a continuously adjustable output from 1.25 V to 30 V at up to 1.5 A. The pack contains ten identical boards for prototyping or small-run production.

Integration Into A Prototype Build

The three-wire AC input connects directly to a suitable transformer secondary, so no separate rectifier board is required. Each module provides both positive and negative rails from a single PCB, freeing bench space and reducing wiring compared with two single-ended regulators. Designers must provide adequate heatsinking for the pass devices when operating near the 1.5 A limit.

Thermals Noise And Power Draw

Linear regulation keeps output ripple very low, with a typical rejection ratio of 80 dB. Load regulation is 0.1 % and line regulation is 0.01 %, so voltage remains stable as current demand changes. Built-in short-circuit, overcurrent and thermal-shutdown circuits protect the silicon during fault conditions, but sustained high current will raise device temperature significantly.

Punti di forza

  • ±DC 1.25V to 30V adjustable output for flexible prototyping
  • Guaranteed 1.5A output current powers demanding circuits
  • 01% line regulation keeps voltage stable under supply changes
  • 80dB ripple rejection delivers clean power for sensitive components
  • circuit, overcurrent and overheating protection safeguards your build

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Domande su questo articolo

What is the guaranteed output current before the protection limits activate?

The module guarantees 1.5A output current with overcurrent and overheating protection.

How much heat or noise does the board produce when running continuously?

Linear regulators dissipate heat proportional to the input-output voltage difference and load current; no fan is included.

What external AC source must I already have to power these modules?

You need a dual AC supply below 28V with three wires to feed the board.

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