First of all, the linear power supply refers to the DC regulated power supply in which the regulating tube operates in a linear state. The benefits are:
1, the output ripple is small
2. The noise generated by the work is low.
This is especially used on amplifiers. But there are also disadvantages: the fever is relatively large. The ripple is small enough to make up for this deficiency.
Because I often do some electronic production and play. When I was testing, I was looking for power everywhere, which was very troublesome. Find a charger at 12V. Look for a mobile phone battery at 4.5V.
Later I wanted to use the LM317 for adjustable voltage regulation. But the current is too small. It is only 2A at most. Someone would think that there is no need to expand the flow? But my transformer is rectified to be 45V. The maximum voltage of the LM317 is only 40V.
Later, the netizen said to help me design a circuit with a FET. This circuit output is continuously adjustable from 1.25-35V. Output 4A with protection.
The picture above is:
Circuit diagram
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