Velleman K1823 User manual

K1823
ILLUSTRATED ASSEMBLY MANUAL H1823IP-1
The easywayto power your
projects.
1 A POWER SUPPLY
Specifications
Great to power your projects and save money on
batteries
Suitable as an adjustable power supply for experiments
Control DC motors, low voltage light bulbs, …
Short-circuit, thermal and overload protection
Dimensions : 52x30mm (2.1” x 1.2”)

2
Features
Just add a suitable transformer (see table)
Great to power your projects and save money on batteries
Suitable as an adjustable power supply for experiments
Control DC motors, low voltage light bulbs, …
Specifications :
 Preset any voltage between 1.5 and 35V
 Very low ripple (80dB rejection)
 Short-circuit, thermal and overload protection
 Max input voltage : 28VAC or 40VDC
 Max dissipation : 15W (with heatsink)
 Dimensions : 52x30mm (2.1” x 1.2”)
Features & Specifications
Choose the right transformer
Max DC output voltage Transformer rating
3..5V 9VAC / 15VA
5..8V 12VAC / 30VA
8..13V 15VAC / 30VA
13..15V 18VAC / 30VA
15..18V 22VAC / 30VA
18..22V 24VAC / 50VA
22..35V 28VAC / 50VA

3
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. 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
1.2 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, the 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.
0.000
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

DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
ALWAYS CHECK THEIR VALUE ON THE PARTS LIST!
REMOVE THEM FROM THE TAPE ONE AT A TIME !

5
R1 : 120 (1 - 2 - 1 - B)
2. Resistor R...
Construction
D1 : 1N4007
D2 : 1N4007
D3 : 1N4007
D4 : 1N4007
1. Diodes. Watch the polarity !
D...
CATHODE

RV1: 4K7
3. Trim potentiometer
SK1
SK2
5. Terminal blocks
C1 : 0,1µF, 100nF (104)
4. Capacitors.
c... VR1: LM317
It has not to be cooled if used for
small powers.
7. Voltage regulator
IC
C2 : 1µF

C3 : 10µF
6. Electrolytic Capacitor.
Watch the polarity !
C...
C4 : 2200µF
8. Electrolytic Capacitor.
Watch the polarity !
C...

6
Connection example
9. Connection example
Execute the connection as
depicted in the figure. Connect
the alternating voltage of a
transformer with the ‘AC IN’
connections. Connect the
output voltage with the ‘+’ and
‘-‘ connections. Set the desired
output voltage with trimmer
RV1. Mount VR1 on a suitable
heatsink for applications
requiring more power.
Be sure to provide sufficient
electric insulation: fit an
insulator and a plastic
insulation ring between the
VR1 and the heatsink because
the metal side of the VR1 is
electrically connected with the
rest of the circuit.
Replace the trimmer with a
potentiometer of the same
rating if you want to use the
circuit as a permanently
adjustable power supply.
Fig. 1.0
FUSEHOLDER
FUSE 250mA T
STRAIN RELIEF
AC
POWER
ON-OFF SWITCH
TRANSFORMER
ENCLOSURE
Mica washer
TO220
isolator
DC OUTPUT
+
-
DC output adjust
SILICON
GREASE

7
PCB & diagram
11. Diagram
10. PCB layout.

5410329 310363
Modifications and typographical errors reserved - © Velleman nv. H1823IP’1 (rev.6)
VELLEMAN NV
Legen Heirweg 33, B-9890 GAVERE
Belgium (Europe)