This circuit can be used to test whether infrared controls, such as those for TVs & video recorders, are functioning properly. If infrared beams fall on the special sensor, the LED lights up, thus indicating that the infrared remote control is working. ...

This very small, highly integrated flasher is connected directly to the light emitting diodes. It can simultaneously flash one or several light emitting diodes or flash 2 LEDs or LED groups alternately (alternating flasher). The module is short circuit proof & protected against reverse polarity. Connection option for 1–10 light emitting diodes. Due to its very small, slim design, this flasher is also suitable for sewing into outerwear as well as for use in models & toys. So you can decorate your clothing with flashing, coloured light emitting diodes for fancy dress parties or clubbing. ...

This tester can be used to test light emitting diodes for all kinds of function, brightness, colour & polarity. The LEDs can optionally be tested with the following currents: 1 m A, 2.5 m A, 5 m A, 10 m A, 20 m A & 50 m A. The test contact can accommodate desoldered LEDs with solder residue on their pins as well as br&-new LEDs. 2 test sockets with the same current (10 m A) are arranged side by side for selecting LEDs of the same brightness. ...