The circuit design here is inspired by National Semiconductor’s application. It starts with three voltage regulators, LM338 [IC1-2-3], connected in parallel. Each regulator can provide up to 5 amperes of current. The final output voltage ranges from +4.5V to 25V DC, which is stabilized. The regulation at the output is achieved using TR1. If continuous voltage regulation isn't required, the resistance value of trimmer TR1 can be measured and replaced with a fixed resistor proportional to the desired output voltage. The rectifier bridge BR1 should be mounted on a metal box to dissipate heat effectively. Conversely, IC1-2-3, which are in the TO-3 package, should be mounted on a large enough heatsink with mica insulation between them and the heatsink. There should be no direct contact between the components and the heatsink. Resistors R1-2-3 should be placed away from the PCB since they generate heat and could damage the board. Pay special attention to the thick cables carrying high currents, ensuring they have sufficient diameter, along with appropriately placed output connectors to avoid short circuits. In the second section of the diagram, there's a simpler circuit based on the LM350 voltage regulator, which can deliver an output voltage ranging from +1.25V to 25V DC with a maximum current of 3A. The IC5, being in the TO-3 package for better thermal conductivity, should also be mounted on a heatsink with mica insulation. The output is controlled via trimmer TR2. This circuit is powered by a power transformer larger than 450VA. The entire assembly should be housed in a suitably sized box that allows for adequate ventilation. A 12x12cm fan operating on 230Vac can aid in expelling excess heat. Voltmeters and Ammeters can be added to the outputs for monitoring purposes. Small Details: R1-2-3 = 0.1Ω 5W C3-5-8-10 = 100nF 100V MKT IC1-2-3 = LM338 [TO-3 case] on Heatsink R4 = 100Ω 0.5W C4 = 220pF 100V Ceramic IC4 = LM308 R5 = 150Ω 0.5W C6-11 = 47μF 63V IC5 = LM350 [TO-220 or TO-3 case] on Heatsink R6-8 = 330Ω 0.5W C7 = 4700μF 63V J1 = 3-terminal block computer type R7-9 = 4.7KΩ 0.5W C9 = 10μF 40V J2-3-4-5 = 2-pin connector 3.96mm step pin R10-13 = 1.5KΩ 0.5W D1-2 = LED Red 5mm F1 = Fuse 5A slow block R11-12 = 220Ω 0.5W D3 = 1N4007 T1 = 230Vac/22Vac 600VA transformer TR1 = 1.5KΩ trimmer BR1 = Bridge Rectifier >250V 35A on Heatsink Symbols: TR2 = 4.7KΩ trimmer BR2 = Bridge Rectifier >250V 3A uF = microfarad, R = ohms, K = kilohms C-2 = 10,000μF 63V Q1 = 2N2905
Heat Shrink Attachment-Air Pressure Diverter Clip
Heat Shrink Attachment-Air Pressure Diverter Clip
Heat Shrink Attachment-Air Pressure Diverter Clip,Heat-shrink tube,Heat shrinkable tubing,thermal contraction pipe,Shrink tube
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