• Tutorial: 555 Timer, PWM LED Driver and Latched Switch – Part 3

    Posted in: Video

    More on 555 timers 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

    Electronic parts to get started playing with the 555 timer circuits:
    http://astore.amazon.com/m0711-20?nod…

    CSS555 Programmable 555 Timer:
    http://www.customsiliconsolutions.com…

    TS555 Low power single CMOS timer:
    http://www.st.com/web/catalog/sense_p…

    An Advancement in Micro-power 555 Timers
    http://blog.customsiliconsolutions.co…

    The 555 timer. A chip so versatile that it has been used in everything from toys to spacecraft. A chip that can act as an oscillator, a schmitt trigger, PWM driver, a siren/alarm, a light or dark detector, and much much more. It is the most popular IC of all time having been around since 1971 and now selling over 1 billion annually.
    http://www.instructables.com/id/Build…