transistors - How to invert a digital signal - Electrical Engineering ...
2012年4月18日 · BTW, a PNP is an option, but more often an NPN will be used. edit (re your comment) If the input signal is high there will flow current through R2 and the transistor's base …
Choosing the right NPN transistor - Electrical Engineering Stack …
2017年9月3日 · I need a transistor as a switch. I need to power a motor with a 9 v battery and on or off the circuit using a 5v signal (from an arduino board). I don't which NPN transistor to …
npn - How does the collector emitter relationship work with a ...
Think of the transistor as a valve or faucet. The base is the knob, the water tends to flow from the positive side (storage tank) to the ground (drain), if you follow the normal "current flow" directions.
How does the current flow through the collector-base junction of …
2016年5月14日 · Long answer: Imagine the same npn transistor in common-emitter configuration, emitter is connected to ground, collector to Vcc = 10V through a resistor R and base to a …
How to connect a npn transistor properly? - Electrical Engineering ...
2016年9月7日 · For an NPN (silicon) transistor to turn ON the base needs to be at least 0.6V more positive than the emitter. For a (red) LED to turn ON you need at least 1V8 across it. The …
npn - Sinking and sourcing current - Electrical Engineering Stack …
2013年7月2日 · But, that's not the only way to use a transistor. For example: simulate this circuit – Schematic created using CircuitLab. This configuration is called common collector or emitter …
What is the collector-emitter resistance of NPN Transistor?
When the transistor is biased such that that it is not saturated, it behaves like a current sink (recall that a perfect current sink has infinite impedance), so the collector-load junction looks like a …
bjt - How do I saturate an NPN transistor? - Electrical Engineering ...
2011年4月15日 · A transistor goes into saturation when both the base-emitter and base-collector junctions are forward biased, basically. So if the collector voltage drops below the base …
How to calculate the power dissipation in a transistor?
The total power in the transistor is the sum of these two: $$ P = V_{BE}I_B + V_{CE}I_C $$ Since the goal of using a transistor is usually to amplify, the collector current will be much larger than …
How do I know if which leg is the emitter or the collector?
2011年12月6日 · \$\begingroup\$ Off the cuff - for jellybean transistors I almost invariably use BC337 (NPN) and BC327 (PNP) - both CBE. A transistor selector book woul;d be the easy …