0-30 Volts / 2,5A Variable Power Supply
The described power supply circuit utilizes the LM723 voltage regulator IC, which is renowned for its stability and versatility in providing regulated output voltages. The output voltage can be adjusted continuously from 0 to 30VDC, making it suitable for various applications requiring different voltage levels.
The LM723 operates by comparing the output voltage to a reference voltage and adjusting the output accordingly. It drives the BD137 transistor, which acts as a pre-driver stage, amplifying the current to drive the power transistor, the 2N3055. The 2N3055 is a high-power NPN transistor capable of handling significant current loads, making it ideal for this application.
Short circuit protection is implemented within the circuit to prevent damage to the components. This is typically achieved through a combination of current sensing and feedback mechanisms that shut down the output when excessive current is detected.
For optimal performance, the circuit should be powered by a transformer providing 24 Volts at 3 Amperes. This input voltage is essential for ensuring that the LM723 can maintain the desired output voltage across its adjustable range. Additionally, the 2N3055 will generate a considerable amount of heat during operation, especially under high load conditions. Therefore, it is imperative to use an adequate heat sink to dissipate heat effectively and maintain reliable operation.
Overall, this power supply circuit design is robust, providing a reliable source of adjustable DC voltage suitable for a wide range of electronic projects and applications.This is a high quality power supply with a continuously variable stabilized output adjustable between 0 and 30VDC. the LM 723 is the heart of the power supply which drives the BD137 and then the 2N3055. The circuit provides short circuit protection. And has great stability at voltage changes.
Drive the circuit with 24 Volts 3A from a transformer. the 2N3055 needs a good heat sink.
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