Total solder points: 18 Difficulty level: beginner 1 2 3 4 5 advanced UNIVERSAL POWER SUPPLY 5 - 14DC / 1A K2570 er your way to pow y s a e e h T projects.
Features & Specifications Features Suits all Velleman kits requiring a regulated power supply between 5 and 12VDC, and no more than 1A. Specifications : Input voltage: 7-16VDC / 1A Output voltage: 5-14VDC, regulated Output current: max. 1A Power limitation and thermal overload protection Max. dissipation: 7W PCB dimensions: 77 x 61mm (3.0" x 2.
Assembly hints 1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: • A good quality soldering iron (25-40W) with a small tip. • Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections.
Assembly hints 1.3 Soldering Hints : 1- Mount the component against the PCB surface and carefully solder the leads 2- Make sure the solder joints are cone-shaped and shiny 3- Trim excess leads as close as possible to the solder joint REMOVE THEM FROM THE TAPE ONE AT A TIME ! DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
Construction 1. Diodes. Watch the polarity ! D1 D2 D3 D4 : : : : 1N4007 1N4007 1N4007 1N4007 4. Trim potentiometer 6. Voltage regulator RV1 D... CATHODE 2. Resistor RV1 : 470 ohm R... 5. Electrolytic Capacitor. Watch the polarity ! C2 : 2200µF R1 : 270 (2 - 7 - 1 - B) 3. Capacitors C1 : 100nF (104) C3 : 100nF (104) C... C... VR : UA7805 Place the heatsink and the regulator on the PCB. Ensure that the hole of the heatsink and the one of the regulator correspond to the hole in the PCB.
Use & PCB 7. Use To use the circuit without problem, take into account the power dissipation in the regulator. The transformer voltage must always be 2V higher than the maximum desired output voltage. If, for instance, you need an output voltage of 12V, then you need to fit a transformer of 14V. If, as an output voltage you only need 6V, use a transformer having 8V and not 14V, because with an 8V transformer the dissipation in the regulator will be of approximately 5W when drawing a current of 1A.
Diagram 9.
Modifications and typographical errors reserved © Velleman nv. H2570IP - 2004 - ED1 (rev.1.
