LED Flexi Strip

 This contact with a lead to a positive terminal of the stroke, the stroke which should be displayed. LED Bulb With this simple method can check out whether there is a broken pen digital tube (not shown a stroke), even the pen (some strokes together), and can compare the relative strength of different strokes luminescence properties. If checking the common anode LED, just remove the battery positive and negative lead to render it, as above.

        LED digital tube every stroke current ILED between about 5-10mA, if the current will damage the digital tube, so you must add the current limiting resistor, the resistance can be calculated as:

LED Module

        R-value = (U-ULED) / ILED

        Where U is added to the voltage across the LED, ULED for the LED digital tube pressure drop per stroke (about 2 volts).

  LED Flexi Strip

        HFE socket using digital multimeter can easily check the LED digital tube luminescence. Choose NPN gear when, C positively charged holes, holes month negatively charged. Such as checking LTS547R type common cathode LED digital tube, from the E-hole insert a single strand of thin wire, wire leads terminating 9 pole (first ③ ⑧ feet and legs in the internal connectivity, you can choose one as?); Then from C leads to a hole in turn contacts the pen wire segment electrodes, respectively corresponding to the pen display segments.