Velleman K7203 is a beginner-friendly power supply kit that provides a stabilized DC voltage between 3 and 30V, with a maximum current of 3A. It is designed to be used as an auxiliary or permanent power supply for common Velleman kits or other projects that require a stable DC voltage within the specified range. The kit includes all the necessary components and a detailed assembly manual to guide you through the construction process. Once assembled, the power supply provides several features and use cases:
- Adjustable output voltage: The output voltage can be adjusted between 3 and 30V using a potentiometer, allowing you to customize the power supply to meet the specific requirements of your project.
Velleman K7203 is a beginner-friendly power supply kit that provides a stabilized DC voltage between 3 and 30V, with a maximum current of 3A. It is designed to be used as an auxiliary or permanent power supply for common Velleman kits or other projects that require a stable DC voltage within the specified range. The kit includes all the necessary components and a detailed assembly manual to guide you through the construction process. Once assembled, the power supply provides several features and use cases:
- Adjustable output voltage: The output voltage can be adjusted between 3 and 30V using a potentiometer, allowing you to customize the power supply to meet the specific requirements of your project.
3 TO 30VDC / 3A POWER SUPPLY
K7203
ILLUSTRATED ASSEMBLY MANUAL H7203IP-1
Total solder points: 57
Difficulty level: beginner 1 2 3 4 5 advanced
A power supply for all our kits, based
on a stabilised DC voltage of 30V.
2
This kit is meant as an auxiliary or as a permanent power supply for all common Velleman kits based on a
stabilized DC voltage between 3 and 30V provided that the consumption does not exceed 3A.
Of course this power supply unit can be used for other purposes, as long as the maximum specifications are
taken into account.
Technical data :
Short circuit protected
Overload protected
Heatsink included
Output voltage: adjustable 3 to 30V stabilized.
Output current: max. 3A
Output ripple voltage: 0.5mV.
Input: 9 to 30V transformer, depending on the desired output
Dimensions (LxWxH): 130x91x50mm
Transformer not included
Features
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.
⇒ 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
.0
0
0
4
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 !
AXIAL COMPONENTS ARE TAPED IN THE CORRECT
MOUNTING SEQUENCE !
You will find the colour code for the resistances and the LEDs in the HALG
(general manual) and on our website: http://www.velleman.be/common/service.aspx
5
R1 : 8K2 (8 - 2 - 2 - B)
R2 (Uout = output voltage)
Uout 3...8V : 5K6 (5 - 6 - 2 - B)
Uout 8...30V : 2K2 (2 - 2 - 2 - B)
R3 : 680 (6 - 8 - 1 - B)
R4 : 1K (1 - 0 - 2 - B)
R5 : 82K (8 - 2 - 3 - B)
1. Resistors
R...
Construction
IC1 : 14P
2. IC sockets, Watch the
position of the notch !
C1 : 470pF (471)
C2 : 100nF (104)
C3 : 100nF (104)
3. Capacitors.
C...
RV1 : 10K
4. Resistor trimmer
RV1
C4 : 100µF
C5 : 10.000µF
8. Electrolytic Capacitor.
Watch the polarity !
C...
D1 : 6A2 or 6A6
D2 : 6A2 or 6A6
D3 : 6A2 or
6A6
D4 : 6A2 or 6A6
D5 : 6A2 or 6A6
D6 : 6A2 or 6A6
5. Diodes. Watch the polarity!
D.
CATHODE
R6 : 0.18E
6. 5W resistor.
R...
2mm
J1 : 2 x 2p
7. Screw connectors
6
Construction
IC1 : UA723D
9. Power transistor
M3 NUT
M3 BOLT
LOCK WASHER
TRANSISTOR
HEATSINK
PCB
Fig 1.0
T1 : MJ3001 or 2N6284G
Apply some thermo-conducting
pasta to the bottom side of the
transistor and mount it on the
PCB simultaneously with the
cooling profile following the
instructions in the figure 1.0.
10. IC. Watch the position of
the notch!
7
Assembly into a housing
Depending on the transformer used, one may chose one of two housings with the following reference nr. for
ordering: L750 or L760.
If the circuit is to be integrated into another housing, it must be provided with ventilation holes (one may
make these holes oneself), necessary for the release of the heat developed.
If a metal housing is used, it must be earthed for security purposes.
Make sure the cooling body does not touch the housing. This might cause a short circuit.
When mounting a toroidal transformer, it must be seen to that the fixation bolt does not touch the cover. This
might cause the burning of the transformer
11. Assembly into a housing
8
Depending on the output voltage needed, one should chose the right transformer for connection to the circuit
according to the table in the parts list. If one choses too high an input voltage, it may well be so that the
power transistor is overheated.
The secondary winding of the transformer is connected to the AC points. It may be that the transformer has
two secondary windings which should be connected either in parallel or in series. The colour code can be
found on the packaging.
For safety reasons, the primary winding of the transformer is connected to the mains voltage via a mains
switch and a fuse. The rating of the fuse can be selected from the table in the parts list.
Connect a voltage meter to the points ‘GND’ and ‘+OUT’ and adjust ‘RV1’ until the desired output voltage
is reached.
Connect the circuit to be supplied by the present unit between the points ‘GND’ and ‘+OUT’. Watch the
polarity!
12. Connection
Connection
9
TRANSFORMER
+OUT
AC
GND
AC
K7203
MAINS
LOAD
N
F
L
Desired
regulated
output voltage
R2 Desired transformer
ordercode
only @230VAC
Desired fuse
230VAC
Desired fuse
110VAC
3...5V 5K6 9V / 30VA - 309 160mA Slow 315mA Slow
5...8V 5K6 12V / 50VA - 5012 250mA Slow 500mA Slow
8...13V 2K2 15V / 50VA - 5015 250mA Slow 500mA Slow
13...15V 2K2 18V / 80VA - 8018 400mA Slow 800mA Slow
15...18V 2K2 22V / 80VA - 80220 400mA Slow 800mA Slow
18...22V 2K2 24V / 80VA - 8024 400mA Slow 800mA Slow
22...30V 2K2 30V /120VA - 12030 800mA Slow 1.5A Slow
Connection
- +
10
13. PCB layout.
PCB
11
14. Diagram
Diagram
VC
10
AC
7
R3
680
V-
NON INV
VOLTAGE ADJUST
RV1
10K
IC1
REF
513
723
64
NC
NC
NC
NC
14
93
1
82
AC
C5
10000u
D2
6A6
D1
6A6
D4
6A6
D3
6A6
V+
C2
100n
12 11
MJ3001 T1 D5
6A6
C3
100n
R1
8K2
R2
2K2
C1
470p
COMP
INV
R6
0.18/5W
CS
CL
C4
100u
D6
6A6 GND
+
OUT
I
NPUT
OUTPU
T
R5
82K
R4
1K
Modifications and typographical errors reserved
© Velleman Components nv.
H7203IP - 2010 - ED1 (Rev.1)
VELLEMAN Components NV
Legen Heirweg 33
9890 Gavere
Belgium Europe
www.velleman.be
www.velleman-kit.com
5
4
1
0
3
2
9
2
8
9
7
4
4
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
Velleman K7203 is a beginner-friendly power supply kit that provides a stabilized DC voltage between 3 and 30V, with a maximum current of 3A. It is designed to be used as an auxiliary or permanent power supply for common Velleman kits or other projects that require a stable DC voltage within the specified range. The kit includes all the necessary components and a detailed assembly manual to guide you through the construction process. Once assembled, the power supply provides several features and use cases:
- Adjustable output voltage: The output voltage can be adjusted between 3 and 30V using a potentiometer, allowing you to customize the power supply to meet the specific requirements of your project.
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