Total solder points: 69 Difficulty level: beginner 1 2 3 4 5 advanced SYMMETRIC 1A POWER SUPPLY K8042 ic symmetr l a s r e iv t un Low cos wer supply po ILLUSTRATED ASSEMBLY MANUAL H8042IP-1
Features & Specifications Features low cost universal symmetric power supply just add a suitable transformer and a heatsink ideal for e.g. op-amp applications, amplifiers, ... trimmers can be replaced by potmeters to allow continuous adjustment of output voltage LED output indicators compact size Specifications : positive and negative output adjustable between 1.2 and 24VDC output current: up to 2 x 1A continuous (with suitable heatsink) max.
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 AXIAL COMPONENTS ARE TAPED IN THE CORRECT MOUNTING SEQUENCE ! REMOVE THEM FROM THE TAPE ONE AT A TIME ! You will find the colour code for the resistances and the LEDs on our website: http://www.velleman.be/common/service.
Construction 1. Jump wire 4. Capacitors. J 7. LEDs. Watch the polarity! C3 : 100nF (104) C4 : 100nF (104) C... 2. Diodes. Watch the polarity ! D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 : : : : : : : : : : 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 LD... 5. Trim potentiometers CATHODE 3. Resistors LD1 : 3mm Red LD2 : 3mm Red RV1 : 2K2 RV2 : 2K2 (2K5) (2K5) 6.
Construction 9. Voltage regulators VR1 : LM317 VR2 : LM337 VR... 10. Heatsink 15mm M3 bolt When you want to use the maximal 20W dissipation mount the optional heat sink, ordernr. : HS4003. 1 Apply a little heat conducting paste (obtain from your specialized dealer) to one side of an insulation plate and press it with this side against the heatsink, there were the component has to be fitted.
Heatsink construction 2 Fit the components and heatsink onto the PCB and fix it by means of two 5mm spacers and two screws. Spacer 3 Screw Solder now the connections of the voltage regulators.
Enclosure 11. Using a metal enclosure as a heatsink When mounting the Kit into a enclosure, you have to drill two holes in the backside of the housing to pass the 15mm M3 bolts trough.
enclosure 12. Connection VA 0 0 VB Req. output voltage Req. AC input voltage (transformer) +/- 1,2 ... 5V 2 x 9VAC +/- 5 ... 9V 2 x 12 - 15VAC +/- 9 ... 12V 2 x 15VAC +/- 12 ... 15V 2 x 18VAC +/- 15 ... 18V 2 x 22VAC Absolute max.
PCB 13.
diagram 14.
VELLEMAN Components NV Legen Heirweg 33 9890 Gavere Belgium Europe www.velleman.be www.velleman-kit.com Modifications and typographical errors reserved © Velleman Components nv. H8042IP - 2004 - ED1 (rev 1.