Publicité
Les langues disponibles
Les langues disponibles
G
O P E R A T I N G I N S T R U C T I O N S
Alternating LED Flasher
(Assembly Kit)
Item no. 195146
Intended use
The product acts as the visual representation of an alternating blinking light, such as in a scale model project/
model railway layout. The flashing frequency can be adjusted by means of a trimming potentiometer.
Always observe the safety instructions and all other information included in these operating instructions.
Please read the operating instructions carefully and do not discard them. If you pass the product on to a third
party, please hand over these operating instructions as well.
Any use other than that described above could lead to damage to this product and involves risks such as
short circuits, fire, electric shock, etc.
This product complies with the applicable national and European requirements. All names of companies and
products are the trademarks of the respective owners. All rights reserved.
Package contents
• Assembly kit
• Operating instructions
Safety instructions
The warranty/guarantee will be void in the event of damage caused by failure to observe
these operating instructions! We do not assume any liability for any resulting damage!
We do not assume any liability for material and personal damage caused by improper use
or non-compliance with the safety instructions! In such cases, the warranty will be null
and void!
• For safety and licensing reasons (CE), unauthorised conversion and/or modification of the
product is not permitted. Follow the mounting instructions.
• The product is not a toy and it should be kept out of the reach of children.
• The product must not become damp or wet.
• In order to avoid short-circuits and their consequences, the ready assembled kit must be
installed in a suitable enclosure.
• Build the assembly only if you are sufficiently skilled to perform the relevant soldering tasks.
For assembling, use a suitable electronic soldering iron (small soldering tip, max. heating
power 50 W).
Improperly constructed kits are not covered by the warranty.
Circuit description
The LEDs are activated via the alternately switching transistors T1 and T2 (here, the components C1, C2,
and P1 determine the timing). The resistors R1 and R4 limit the current flow through the LEDs.
The flashing frequency can be continuously adjusted within wide limits by means of the trimming potenti-
ometer P1.
General information on assembling the kit pieces
For the alternating LED flasher to work after assembly, you must carry out the construction conscientiously
and carefully.
Double check each step and each solder joint twice before you are going to build the next component!
Adhere to the described building stage; do not skip any of the building stages! Tick each item twice, once
for building, once for testing.
In any case, take your time. Building an assembly kit is no piecework, because the time which you are spend-
ing here is three times less of the time you would have to spend on troubleshooting.
If the assembly is not functioning, an assembly error is often the cause, like incorrectly installed components
such as transistors, LEDs and electrolytic capacitors. It is also important to pay attention to the coloured rings
of the resistors, as some have ring colours that can be easily confused. If you cannot recognize the coloured
rings clearly, measure the resistance with a suitable meter.
If the circuit board's components assembly is all right, examine the board for "cold" solder joints. These
appear if either the solder joint was not heated up sufficiently so that the soldering tin does not have proper
contact to the wires, or if during the cooling process the connection is moved right at the moment of so-
lidification. Such mistakes can often be spotted by the matte appearance of the soldering joint's surface. A
corrective measure would be to reheat the solder joint in a proper way.
Building the assembly
All components are inserted on the side of the circuit board on which the component labels are
located. On the other side of the board (with the conductor traces), the components are soldered
up.
a) Resistors
www.conrad.com
First, the angularly bent resistors are inserted into the corresponding holes (acc. to component diagram).
Then bend the wires of the resistors by ca. 45° apart, so that they do not fall out when you turn the circuit
board. Solder the resistors on the back carefully to the conductor tracks. Now cut off the projecting wires with
Version 02/15
a suitable electronic side cutter.
The resistors used here in this kit are carbon film resistors. These have a tolerance of 5% and are marked
by a gold coloured "tolerance ring".
Normally carbon film resistors have four coloured rings. Hold the resistor in such a way that the gold-coloured
tolerance ring is located to the right of the resistor's body to be able to read the resistor's colour code. The
coloured rings are then read from left to right.
R1 = 470 Ω
R2 = 4.7 kΩ
R3 = 4.7 kΩ
R4 = 470 Ω
b) Capacitors
Insert the capacitors into the designated holes until they rest on the board. Bend the wires on
the solder side slightly apart so that they cannot fall out. Solder the wires neatly up with the
conductor traces.
Pay attention to the correct polarity (+/-) of the electrolytic capacitors. Depending on the manu-
facturer, the positive or the negative pole is marked with an appropriate symbol.
C1 = 47 μF
C2 = 47 μF
Note that the soldering process should not take too long, as this will heat up the electrolyte too
strongly, which may damage the capacitor.
c) Trimming potentiometer
In the course of this step, the trimming potentiometer is installed and soldered to the board.
P1 = 50 kΩ, imprint e.g. B50K (or 100 kΩ, imprint e.g. B100K)
d) Transistor
During this operation, the transistor is installed according to the component diagram and soldered on the
side of the conductor trace.
Mind the location of the transistor; the housing outlines must match those on the component diagram. Take
the flat side of the transistor package as a guide. On no account may the connecting legs intersect; also, the
component should be soldered at a distance of ca. 5 mm to the circuit board. Ensure a short soldering time,
to avoid damaging the transistor by overheating.
T1 = BC547, 548, 549 A, B or C
T2 = BC547, 548, 549 A, B or C
e) Soldering pins (connector pin)
To connect to the operating voltage, use flat or needle-nose pliers to press the
soldering pins from the components side into the corresponding holes on the cir-
cuit board (labelled "+" and "-" ).
Then, the pins are soldered on the side of the conductor trace.
f) Light-emitting diodes
Solder the LED with its correct polarity into the circuit board. The shortercontact leg
indicates the cathode.
Examining the light emitting diode against the light shows the cathode on the larger
electrode inside the LED. The location of the cathode on the component diagram is
represented by a dash in the outline of the LED housing. The LED also has a flat-
tened edge that must match what is printed on the component diagram.
Install the contact pins of the LED by inserting them in the holes on the circuit board
and then solder. The LEDs should be soldered to the circuit board with distance
of about 5 - 10 mm.
g) Final check
Recheck the circuit to see if all components are installed properly, prior to switching it on. Pay attention to
the correct polarity of the various components!
On the soldered side on the circuit board, look for any circuit traces that may have been bridged by solder
residues, which in turn can cause short circuits and damage to components. Also check whether cut wire
ends have been left on the board. This, too, can cause short circuits. Most kits which have been returned
for complaint handling showed poor soldering (disturbed solder joints, wrong solder, etc.) and incorrectly
assembled components.
Please note that assemblies cannot be repaired or replaced if acidic solder, soldering flux or similar was
used.
If you cannot see the coloured rings clearly, we recommend using an appropriate meter to de-
termine the resistance value. However, do not touch the two pins of the resistor with your fingers
(especially in case of high-resistance) during the measuring procedure, because skin resistance
will alter the reading.
yellow / purple / brown
yellow / purple / red
yellow / purple / red
yellow / purple / brown
electrolytic capacitors
electrolytic capacitors
low-power transistor
low-power transistor
Publicité
