velleman K8042 Symmetric 1A Power Supply User Manual

: June 3, 2024
: Velleman

Table of Contents

velleman K8042 Symmetric 1A Power Supply
Features & Specifications
Assembly (Skipping this can lead to troubles
Construction
Connection
PCB layout
Diagram
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velleman K8042 Symmetric 1A Power Supply

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. input voltage: 2 x 24VAC
very good line and load regulation
low ripple
short circuit protection
thermal protection
optional heatsink: HS4003 (for maximum 20W dissipation)
dimensions: 78 x 52 x 24mm (3.1″ x 2.0″ x 0.9″)

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.

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. When solder rolls off the tip, it needs cleaning.
- Thin raisin-core solder. Do not use any flux or grease.
- A diagonal cutter to trim excess wires. To avoid injury when cutting excess leads, hold the lead so they cannot fly towards the eyes.
- Needle nose pliers, for bending leads, or to hold components in place.
- Small blade and Phillips screwdrivers. A basic range is fine.
  For some projects, a basic multi-meter is required, or might be handy.
Assembly Hints :
Make sure the skill level matches your experience, to avoid disappointments.
Follow the instructions carefully. Read and understand the entire step before you perform each operation.
Perform the assembly in the correct order as stated in this manual
Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
Values on the circuit diagram are subject to changes.
Values in this assembly guide are correct*
Use the check-boxes to mark your progress.
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.
Soldering Hints :
Mount the component against the PCB surface and carefully solder the leads.
Make sure the solder joints are cone-shaped and shiny
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 !

Construction

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Heatsink

When you want to use the maximal 20W dissipation mount the optional heat sink, order. : HS4003.

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.
Then apply a little heat conducting paste to the component itself, fit the component onto the heatsink and fix it by means of an insulation tube, an 15mm M3 bolt and a nut.
Fit the components and heatsink onto the PCB and fix it by means of two 5mm spacers and two screws.
Solder now the connections of the voltage regulators

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.

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