20cm Display Kit "Common Anode"

To build-up large displays, LEDs seem to be the most inexpensive versus quality and this, in opposition to bulbs, plasma, TL tubes, etc... This kit contains a 7-segments display consisting of 12 leds per segment, respectively, and 4 leds for the decimal point. With the aid of a supplementary power supply with a little requirement, it is possible to connect this kit to any existing circuit equipped with simple common anode displays of any brand and any dimension. Just remove the small displays and connect the segments and anode of this 20cm display to the corresponding connections on the print. If the digit and segment drivers of the circuit can supply enough current it will be possible to connect in parallel two or more displays, or even, leave the small display of the circuit and to add the 20 cm display in parallel. This latter will not affect the brigthness of the 20 cm display due to the special concept of the driver's circuit (see further).

Specifications

• Common anode
• Power supply : 22 to 26VDC non-stabilized
• Minimum anode input voltage (on) : 2V
• Maximum anode input voltage (off) : 1.2V
• Anode input current (on) and (U = 5V) : + 10mA
• Anode input impedance : 500 Ohm
• Segments input impedance : 10 K
• Segment minimum input voltage (off) : U anode - 0.5V
• Segment input voltage (on) : 0 to (U anode - 1V)
• Segment current : static (R6 = ~ ) : 40mA
  multiplex (R6 = 22 ohms) : 75mA
• Total absorbed current in static usage : maximum 400mA
• Maximum used power (U = 22V) : 8.8 Watt