• Tutorial: 555 Timer, PWM LED Driver and Latched Switch – Part 1

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    Tutorial series on the 555 timer and demonstration on how it works as a PWM LED Driver and Latched Switch.

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  • This is also a follow-up to “A Look Inside #6 – Kelty LumaTech Cree LED Lantern”
    http://youtu.be/gopsOieG7ws

    In the demonstration I need to look at a leakage / quiescent current to see if it can be reduced.

    Topics coved in this video:

    * Some background and history on the 555 timer.
    * Pin layout and description of the 555 timer DIP IC
    * Explanation on how the comparator op amps work inside the 555 timer.
    * Explanation on how the RS Flip Flop works and the its logic
    * An explanation and demonstration of the 555 timer as a latched switch.
    * An explanation and demonstration of the 555 timer as a PWM (pulse width modulated) LED driver / dimmer circuit.
    * A look at transistors and a Darlington pair.
    * A look at how we can improve the quiescent / q-point current of the circuit.
    * 555 timer tutorial
    * Monostable and astable multivibrator