Since we recognize what is a LED, we require some method for controlling it by exchanging it "ON" and "OFF". The yield phases of both TTL and CMOS rationale doors can both source and sink valuable measures of current in this manner can be utilized to drive a LED. Typical incorporated circuits (ICs) have a yield drive current of up to 50mA in the sink mode design, yet have an inside restricted yield current of around 30mA in the source mode arrangement.
Whichever way the LED current must be restricted to a sheltered esteem utilizing an arrangement resistor as we have as of now observed. The following are a few cases of driving light discharging diodes utilizing transforming ICs yet the thought is the same for an incorporated circuit yield whether combinational or consecutive.
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