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                                    This is variable DC power supply circuit, or we can call it adjustable DC power supply which give us a 1.2V-25V output voltage. The power supply schematic above is taken from the datasheet of regulator LM338K manufactured National Semiconductor. The circuit uses IC LM338K as the voltage regulator, so we will get the stable and regulated output. The regulator IC LM338K provides 5A output current max, and the voltage from 1.2 to 32V, it also featured the integrated thermal and short-circuit protection. Maximum voltage at input and output of the regulator is 35V . The transformer current value depends your needs. For example, if you need 120W power output then you’ll need 5A transformer. 5A x 24V (full power) will give you 120W output power. Since this power supply circuit described to give us 1.2-25V DC output, then you must have transformer with 24V AC output. Fo...

2V to 25 Power supply This project makes use of a LM338 adjustable three terminal regulator to supply a current of up to 5A over a variable output voltage of 2V to 25V DC. It will come in handy to power up lots of electronic circuits when you are assembling or building any electronic devices. The schematic and parts list are designed for a power supply input of 240VAC. Change the ratings of the parts if 110VAC power supply input is necessary. As shown in the figure above, the mains input is applied to the circuit through fuse F1. The fuse will blow if a current greater than 8A is applied to the method. Varistor V1 is used to clamp down any surge of voltage from the mains to protect the parts from breakdown. Transformer T1 is used to step down the incoming voltage to 24V AC where it is rectified by the diodes D1, D2, D3 & D4. Electrolytic capacitor E1 is used to smoothen the ripple of the rectified DC voltage. Diodes D5 & D6 are used as a protection devices to prevent capacitors...