The Servo Motor PWM Generator Part 1

Today I do some study on the Pulse Width Modulation (PWM). There are few methods to generate the signals :
1-Analogue method,
2-Digital Method,
3-Discrete Method,
4-Onboard MicroController.
As for the beginning I think I will start with the digital method using the 2 input nor gates since this is the easiest to assemble. This is the circuit that I'm going to assemble after raya break.
This circuit board components requirement are listed below :
1-Variable resistor (potentiometer) 47kohm, 560kohm
2-Ceramic capacitor, 36nF, 100nF
3-Electrolytic capacitor, 10uF
4-2 input nor gates IC4001 with IC base
5-Discrete 1/4W resistor, 1 Mohm, 80.5 kohm, 46.3 kohm
6-PCB with 10mm stands
7-Connectors, 2 set of 2p for DC input and PWM output

I also continue doing the PCB for the USB Port Tester Board. Now all components are soldered already. However, the wiring I guess would only be completed by next month after raya break as well. Once the wiring is completed, it would looks something like this one.

As for Mr Khow, today he already started with the hardware programming using Borland Turbo C Compiler. To jumpstart, I advised him to simply rewrite the old 8255 working program and learn it while doing it hands on. Yet, to understand better for port assigning, I advised him to learn how to use the keyboard key first as it is easier to understand.