Multifunction digital circuit teaching demonstration instrument

The invention discloses a multifunction digital circuit teaching demonstration instrument, the instrument comprises a function board, and a power switch, 13 key switches, 25 LED lamps and a function module which are arranged on the function board, a control circuit is arranged in the function module, and the control circuit can demonstrate a 8-3 priority encoder 74HC148 working principle, a 3-8 decoder 74LS138 working principle, an one-out-of-eight data selector 74LS151 working principle, a JK trigger 74LS112 working principle, a bidirectional shift register 74LS194A working principle and a 4-bit synchronization binary counter 74161 working principle. According to the invention, the design of the circuit is reasonable, the control is simple, the instrument has characteristics of high integration level, flexibility and variability, the specific circuit is used for helping students to understand and learn the knowledge related to the coursebook, the scientificity is strong, the process is lively and interesting, and the learning enthusiasm can be greatly generated.