1. Rise and rise again until lambs become lions 授課老師：伍紹勳 課程助教：邱麟凱、江長庭

2. Rise and rise again until lambs become lions Outline Generate clock by IC 555 oscillator Implement count up counter by JK flip-flop – 7476 JK flip-flop – count up counter

3. Rise and rise again until lambs become lions Requirement 220Ω 電阻 x 4 、 7476 x 2 、 7400(NAND) x 1(buffer) 、 LED x 4 、 7476 x 2 、 555x1 、電阻 470KΩx2( 黃紫黃 ) 、電解電容 1μF x1

4. Rise and rise again until lambs become lions 555 oscillator Refer to exp.11 555 Calculator (Website)

5. Rise and rise again until lambs become lions 555 oscillator You can connect output of 555 to a buffer – Oscillator would be more stable – E.g. connect output of 555 to an inverter or AND output of 555 with signal 1 Electrolytic capacitor( 電解電容 ) – With polarity (long pin should connect to VCC) + -

6. Rise and rise again until lambs become lions 7476 Dual Master-Slave J-K Flip-Flops with Clear, Preset, and Complementary Outputs Falling-edge Trigger JK Flip-Flop Reset Preset Toggle

7. Rise and rise again until lambs become lions Count up counter 0000 000100100011 0100 2 0 : 0->1 (Toggle) 2 0 : 1->0 (Toggle), carry to next digit 2 0 : 0->1 (Toggle) 2 0 : 1->0 (Toggle), carry to next digit 2 1 : 0->1 (Toggle) 2 1 : 1->0 (Toggle), carry to next digit 2 2 : 0->1 (Toggle)

8. Rise and rise again until lambs become lions 4-bits output – output=input+1 at falling edge Count up counter 00000001 1111 001000110100 11001011101010011000 0101 0110 0111 1110 1101 +1

9. Rise and rise again until lambs become lions Count up counter 題外話 : 在設計電路時，應盡可能遵守只用 ” 單一時脈 ” 及 ” 不要把時脈拿來做邏輯運算 ” 二個原則，以免產生 不必要的 Bug 。 ( 除非很有把握電路不會出錯 )