014 NPN BJT switch improved 555 timer output NE555

Most 555 timers fail to output the full positive side of the power supply voltage. This results in less voltage to a load headed to ground while the output is high. However, by attaching an NPN BJT to the load, you can used the 555 timer’s high and low output to simply turn the switch on and off. In that way, the load will get virtually all of the power supply voltage.

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Electronics course 14 Improving 555 timer high output using NPN bipolar junction transistor 2N3904

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