User manual

English WBA-1/WBA-2
Page 22
Operation overview
The module is a so-called "astable multivibrator". Two transistors on
the PCB serve as switches and alternately switch the power supply for
the connected LEDs on and off: When the one switch (transistor) is
opened, the other one is closed. As long as the switch is open, electric
energy is saved in the respective capacitor. As soon as the capacitor is
charged, the circuit is switched: The switch closes and the capacitor
belonging to the other switch starts to charge.
Depending on the value of the capacitors and the respective resistors
(RC-combination), the LEDs connected to the module, flash faster or
slower. By inserting the original components, the flashing frequency is 1
to 2 Hz. The frequency can be varied by changing the capacitors and
the respective resistors.
Two or more LEDs are connected in parallel or in series to the two
outputs of the module. The LEDs should be connected directly to the
module. Additonal series resistors are not required.
Technical specifications
Supply voltage 12-18 Volt a.c. or d.c. voltage
Current consumption(with loads) approx. 5 mA
Protected to IP 00
Ambient temperature in use 0 - + 60 °C
Ambient temperature in storage -10 - + 80 °C
Comparative humidity allowed max. 85 %
Dimensions (WBA-1) ca. 23 x 26 mm
Dimensions (WBA-2) ca. 10 x 10 mm
Weight (WBA-1) approx. 5 g
Weight (WBA-2) approx. 0,5 g