Adjustable power supply

• Adjustable power supply

  • As I carry out a lot of repairs on C.B. and audio equipment, I need a variable power supply with very good current limiting and protection. The circuit I designed for this purpose is shown in the diagram below. This power unit will deliver a current from zero to about 4.25A at a voltage from zero to about 23V. With the component values shown, the short circuit protection is 400 mA, but it can be set below this figure; for instance, an LED can be connected directly to the power supply and the current adjusted to light it without destroying it. The unit is not difficult to build, and in my opinion it outperforms many commercial power supplies. Mine has been in use for more than a year, and has given no trouble at all in that time.
    
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