The JK trigger of this circuit can be a dual JK trigger of amateur T079 or a single JK trigger of amateur T078. The NAND gate can be a dual NAND gate integrated circuit of amateur T063, T067, 7MY23, etc. The light-emitting diode uses a red-emitting gallium phosphide or gallium arsenide phosphide light-emitting diode. The power supply should be a 5V regulated power supply. Other components are selected according to the requirements in the figure. As long as the whole circuit is assembled correctly, it can be used normally.
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