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Wiring diagram
Component diagram
Connection/Startup
After the board has been equipped and checked for possible errors (bad solder joints, solder bridges), an
initial function test can be carried out. Proceed as follows:
• Turn the adjuster control of the trimming potentiometer to the centre position, approximately.
• Place the board so that the contacts at the bottom do not contact any metallic surfaces; place it on a
magazine or a book, for example. Otherwise, this may cause a short circuit!
• Connect the terminal clamps marked with "+" and "-" with the correct polarity to the operating voltage
(9 - 15 V/DC). Incorrect polarity destroys the product; the warranty will be void!
Warning!
The alternating LED flasher must be powered by stabilized DC voltage of 9 - 15 V/DC, provided,
for example, by an appropriate power adapter.
• Now both LEDs must flash alternately.
• You can adjust the flashing frequency by turning the trimming potentiometer.
If the function test is unsuccessful, disconnect the alternating LED flasher from the operating
voltage. Proceed as described in the following check list.
Check list for troubleshooting
• Is the operating voltage polarized correctly?
• Is the operating voltage 9 to 15 V/DC?
• Are the resistors soldered right?
• Are the electrolytic capacitors soldered with respect to correct polarity? Compare the polarity printed on the
electrolytic capacitors with the component diagram or layout diagram attached to the circuit board. Note
that depending on the brand of electrolytic capacitors "+" or "-" may be indicated on the component!
• Are both transistors soldered the right way round? The housing form must match the component diagram.
• Are both transistors soldered the right way round?
• Is there a 'cold' soldering joint? Check each solder joint thoroughly! Check using tweezers to see if com-
ponents wobble. If a solder joint looks suspicious, you should solder it again for the sake of safety.
• Is there a solder bridge or a short circuit on the side of the solder? Compare conductor trace connections
that may look like an unwanted solder bridge with the trace image of the imprint placement and the circuit
diagram before you interrupt a circuit connection (supposed solder bridge)! In order to determine trace
connections or interruptions easier, hold the circuit board against a bright light.
• Check whether each solder point is soldered; it often happens that solder joints are overlooked.
• Always remember that a circuit board that is soldered using soldering fluid, soldering paste or similar
fluxes, or when unsuitable solder is used, may not function. These materials are conductive and cause
current leakage and short circuiting.
Practical tips
• To activate the alternating LED flasher, you may use a power adapter, for example, with an output voltage
of 12 V/DC. If you do not want to cut off the plug, use a suitable socket, which can be connected to the
alternating LED flasher's terminal clamps using a piece of wire.
The alternating LED flasher can also run on a 9 V block battery.
In that case, strictly observe correct polarity; use a suitable meter, if necessary. Reverse polarity ruins the
alternating LED flasher, the warranty will be void!
• The LEDs do not necessarily have to be soldered onto the circuit board; you may also use an extension
cord (max. cable length about 30 cm). However, ensure that the contact pins of the LEDs are insulated
accordingly to prevent short circuits. For example, use a heat shrink tubing slid over the contact pins or a
piece of electrical tape.
Disposal
Please dispose of the product according to the relevant statutory requirements when it is no
longer used.
Technical data
Operating voltage ........................9 - 15 V/DC (stabilised)
Current consumption ...................approx. 30 mA
Dimensions (L x W x H) ...............50 x 45 x 20 mm (ready built up assembly)
This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau
(www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited. This publication represent the technical status at the time of
printing.
© Copyright 2015 by Conrad Electronic SE.
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