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Full project name: Lithium-ion Battery Protection and Charger with CMOS 555 Dimmable Light with Touch Switch

PS. The thumbnail is the actual finished product.

In this video, a high-quality manual PCB trace drawing technique is demonstrated from beginning to end. However, a lot of hard work goes into designing the circuit and positioning the components. When that hard work has already been done, routing the board is a simple task, yet it still requires an elevated level of craftsmanship and attention to detail.

This board is mainly designed as a lithium-ion battery-powered LED light with a touch switch and dimmable control via a MOS 555 timer. The board has built-in battery protection and a charging circuit. For versatility, it also has a 12-volt DC input jack. This can be used to power, for instance, a 12-volt LED strip with dimmable control and a touch switch, making it easy, effective, and relatively inexpensive. Diode 2 controls the PWM range. It has a 10% to 50% duty cycle with its designated polarity. Reversing the polarity of Diode 2 changes the duty cycle to 50-90%. When powered by a lithium-ion battery, I don't need to power the LED at full brightness; a 10% to 50% range is sufficient for both battery life longevity and the LED light. When powering a 12-volt device with a 12-volt source, a 50% to 90% duty cycle is more useful. I designed the 555 timer this way so the brightness level is finely controllable and within a desirable range.