LM317 variable power supply
The circuit employs the LM317 voltage regulator, a popular choice for adjustable power supplies due to its ease of use and reliability. The LM317 can output a voltage range from 1.25V to 37V and is capable of delivering a maximum output current of 1.5A, provided that adequate heat dissipation is ensured. To achieve the desired output voltage, the circuit utilizes a 1k linear potentiometer connected to the adjustment pin of the LM317. This allows for fine-tuning of the output voltage within the specified range of 1.6V to 13.5V.
The basic configuration of the circuit includes an input capacitor (typically 0.1µF) to filter any high-frequency noise from the power source, and an output capacitor (usually around 10µF) to stabilize the output voltage. In conjunction with these capacitors, a heat sink is necessary for the LM317 to prevent overheating during operation, especially when delivering currents close to its maximum rating.
The transformer used in this circuit should be selected based on the required input voltage and current. A transformer with a secondary voltage rating slightly higher than the maximum desired output voltage (13.5V) is recommended to account for voltage drops across the LM317 and other components. Additionally, the transformer must be capable of supplying sufficient current, ideally rated for at least 2A to provide a safety margin.
Overall, this variable power supply circuit is well-suited for powering various small electronic devices, making it a valuable tool for hobbyists and professionals alike. Its simplicity and effectiveness in providing stable and adjustable output voltage make it an essential component in many electronic projects.It`s a variable power supply based on a lm317 voltage regulator the range of power is between 1.6 and 13.5 volt, you can get till 1,5 Amp. if supply the IC of a good cooler such as an aluminium plate. The range can be varied by turning the 1k linear potentiometer. This circuit is good for that kind of little home appliances like walkman, disc player, gsmcharger. Finally it` s a stable and affordable power supply always useful !!. Obviously the transformer should be adequated to the current requested from t 🔗 External reference
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