Brief NPN BJT timed off fade circuit- RC time constant

Capacitors take time to discharge. Using them with a resistor at the base of a transistor allows them to slow down the time it takes a BJT to turn off.

Brief circuit schematics with short video – List of pages

2N3904 NPN BJT pin layout schematic symbol and current paths diagram by electronzap electronzapdotcom
2N3904 NPN BJT pin layout schematic symbol and current paths diagram by electronzap electronzapdotcom

The 2N3904 is very popular NPN Bipolar Junction Transistor (BJT). Therefore, I use them in many of my videos.

The pin layout and direction of voltage and conventional current flow (positive to negative) is shown in the first diagram.

Diagram

Simple NPN BJT RC time constant fade off switch circuit schematic diagram by electronzap electronzapdotcom
Simple NPN BJT RC time constant fade off switch circuit schematic diagram by electronzap electronzapdotcom

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Video

Quick timed fade off NPN BJT switch circuit using 2N3904 bipolar junction transistor by electronzap

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