| 摘要 |
PURPOSE:To eliminate the need for trimmer condenser by making rate adjustment with a frequency divider. CONSTITUTION:A frequency divider 2 is constituted by binary-ternary changeover circuits K1 thru K4, T type flip-flops FF1 thru FF11. Then, the frequency divider 2 normally acts as a binary counter. Each time when two input pulses are inputted to its input terminal 2a from a reference signal source 1, it outputs one pulse at its output terminal 2e. When the output of the NAND gate G1 in a set pulse generating circuit 3 becomes ''low'' and the signal thereof is inputted to its input terminal 2c, the frequency divider reads the contents of the switches S1 thru S4 in a memory element 4 and when the output becomes ''high'', it changes to a ternary counter and the outputs thereof are displayed in a display means 5 via the flip-flops FF1 thru FF11. |
