Mall "Today the price of gold", the hotel's "house today," gas station "Today oil prices" and price, often with light-emitting digital display, the new chic, eye-catching. LED digital display card design unique, dynamic scanning and decoding technology, the IC driver with little more than just digital display tubes, and can easily increase or decrease the number of digital control, easy to adjust the settings, not afraid of power-down.
Circuit as shown. N1 ~ Nn for the nine mini digital toggle switch, set, each switch can only turn them one (1 ~ 9), the rest off. Disconnect all when 1 to 9, said "0." For example, to the first 3 digit LED display N1 ~ N3 "098", the N1 ~ N3 of the connected state: N1-not connected, N2-9th turn, N3-section 8 connected; remaining set the same way. DSP in the N1 ~ Nn screen 1.5-inch high-brightness LED common cathode, followed by correspondence with the N1 ~ Nn.