Brief 74HC14 integrated circuit IC controlling a higher voltage electronics circuit

Many integrated circuits can’t handle more than about 5V.  If your power supply and the rest of the circuit is more than 5 volts, then you will need a reliable way to reduce that voltage to the 5V for everything connected to the IC.

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Diagram:

5V 74HC14 hex inverter schmittt trigger output NOT gates IC controlling a 12V 3 series LED circuit NPN BJT switch schematic diagram by electronzap
5V 74HC14 hex inverter schmittt trigger output NOT gates IC controlling a 12V 3 series LED circuit NPN BJT switch schematic diagram by electronzap



74HC00 series integrated circuit kit that is similar to mine. Unfortunately mine isn’t available anymore. List of included IC’s is shown in the images.

  • 7805 limits voltage from a higher voltage source to only  5V for the 74HC14.
  • The 74HC14 NOT gate output uses it’s 5V output to control a NPN BJT transistor wired as a switch.
  • The transistor can switch a much higher voltage load than 5V without any of that extra voltage reaching the 74HC14 IC and damaging it.

Video:

7805 5V powered 74HC14 hex inverter schmitt trigger output IC controlling 12V LEDs load with 2N3904

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