Velleman K8021 Assembly Manual

⇒Please read the included information on safety and customer service * Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leaflet. 1.3 Soldering Hints : 1- Mount the component against the PCB sur- face 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 ! Assembly hints AXIAL COMPONENTS ARE TAPED IN THE CORRECT MOUNTING SEQUENCE ! ...

25 +15VR -15V 115 5 0 4 18 8 0 9 18 10 115 2 0 1 9 7 0 6 TR1 TR8021 D9 1N4007 D10 1N4007 D111N4007 D121N4007 D13 1N4007 D15 1N4007 D16 1N4007 D14 1N4007 C22 100n C21 100n A D C B 230V N B+C 115V L A+B C+D +5V C27 100n C28 100n C37 470µ C26 100n C25 100n C24 100n C23 100n C36 100µ C47 1000µ C45 1000µ C44 1000µ C46 1000µ C43 1000µ C42 1000µ C41 470µ C40 470µ C38 470µ C39 470µ R36 1R R35 1R R38 1R R37 1R +15V +15VL -15VL -15VR R51 1R SK10 SK11 SK12 R52 470R C29 100n Mains selection MAINS SK14 FASTON To Cover R53 1K5 I O GND VR1 UA7815 I O GND VR3 UA7805 I O GND VR2 UA7915 LD8 L-424YDT ...

is the left channel input section P8021L. First we will start with the small P8021L, then we assemble the P8021B. FTip: The pictures on the packaging can be used as a guideline. However, due to possible changes it is not 100% reliable. CONSTRUCTION q D1: 1N4148 q D2: 1N4148 q D3: 1N4148 q D4: 1N4148 q D5: 1N4148 q D6: 1N4148 1. Diodes (check the polarity) CATHODE D... q R1: 10K (1-0-3) q R2: 10K (1-0-3) q R3: 10K (1-0-3) q R4: 10K (1-0-3) q R5: 10K 1-0-3) q R6: 10K (1-0-3) q R7: 1K (1-0-2) q R8: 330R (3-3-1) 2. ...

-15VR +15VR RV2 100K R28A 1K5 R29 1K8/1% R27 560R/1% RY7 T7 ...

q RV2: 100K 12. Trim potentiometer q T1: BC557 q T2: BC557 q T3: BC557 q T4: BC557 q T5: BC557 q T6: BC557 q T7: BC557 q T8: BC557 11. transistors q SK13: JCF3.5 (3.5mm jack) 14. Phone jack. Mount him straight against the PCB surface ! J... L' R R' L q SW1: TS-04PV q SW2: TS-04PV q SW3: TS-04PV q SW4: TS-04PV q SW5: TS-04PV Remark: The metal part of these but- tons are used as jump wire. Be sure not to test or use the unit without soldering these push buttons. 13. Push button Mount them straight against the PCB surface ! SK.. Construction ...

-15VR +15VR RV2 100K R28A 1K5 R29 1K8/1% R27 560R/1% RY7 T7 ...

a knife or a screwdriver to scratch the paint from the aluminum fixation, from the hole closest to the back end. This fixation will be used later to connect the ground and earth. q Mount the 3, 5mm (0.14”) spacers like in the drawing. Us- ing three hexago- nal screws and a washer. Do not tighten the spacers yet. q Position the PCB in the enclosure and check if the position of the spacers is correct, if so, remove the PCB and tighten the spacers. q Using an ohmmeter, measure between the edge of the aluminum profile and the back spacer, if there is a good electric ...