摘要： 下面是 [显示数字轮盘电路图]的电路图　　材料BOM表R1= 10Kohms R2-9= 1Kohms C1= 0.47 until 2.2uF 16V C2= 100uF 16V C3= 47uF 16V Q1-8= BC550 DSP1= Display 7 segment common cathode IC1= 4011 IC2= 4026 D1-2= 1N4148 TR1= 470Kohms trim. or pot. lin TR2= 100Kohms trim. or pot. lin S1= 1Χ2 Switch S2-3= Push Button normal open BATT= 9V Battery οr ext. supply(责任编辑：电路图)