Homemade CPUs, A Clock Source [Part 3] (EP 68)

Doctor Plague takes you on his journey of designing an adjustable clock source which uses a 555 timer that must adjust from about 1 hertz up to about 10 kilohertz by using a 10 Kilo-ohm potentiometer. Please check out the other parts to this video series: https://youtu.be/j_CMNkEFPso https://youtu.be/_U2SOoNPb5o ERRATA: Around the 9:50 mark there is mention of using a 6.8K resistor...this did not take into account the internal 5K resistors of the 555 timer. We would need to use about a 2.7K - 3.0K resistor to bring the control voltage to no lower than about 2V. With the 6.8K resistor and potentiometer turned to the extreme there would be an internal 555 5K resistor in parallel with the 10K, and 2 internal 555 5K resistors in series (for 10K) that would be in parallel with the 6.8K therefore creating the 2.7V seen on the scope. See if you can find J.S. Bach before the end of the video! Be sure to watch to the end to see if you were correct! Category: Electronics, Technical, DIY Please subscribe, and peck at the bell to be notified of new videos as they become available.