2N2222A Mismatch between emitter and collector
I am trying to figure out what is going on here. I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2N2222A: This is the picture of ...
BJT high frequency analysis - Electrical Engineering Stack Exchange
Jan 19, 2020 · From what I remember, the Cbe depends on the emitter current. Higher current causes lower reac (1/gm); at 1mA, its 26 ohms. at 2mA its 13 ohms 2mA is 4 volts / 2Kohm (ignoring the …
How do I know if which leg is the emitter or the collector? (Transistor ...
Dec 6, 2011 · 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 way to check distributions as they …
CBE Schematic and Wiring - Electrical Engineering Stack Exchange
Sep 15, 2021 · I'm in the process of installing a circuit breaker between a power supply and an HMI device, but have some uncertainty when it comes to illuminating the rocker switch. The part number …
Finding the Base-Emitter Voltage in an NPN Transistor
Start by solving for the base current, treating the BE junction as a diode in series with Rb. The collector current doesn't really effect the base current. Then use beta to get the collector current and calculate …
pinout - Why transistor pin outs are not standardized? - Electrical ...
BC series transistors all use CBE pin order. Except for BC635-BC640, which use CEB order, presumably because Pro Electron just wants to watch the world burn. 2SA and 2SC transistors all …
C-E leakage current, breakdown voltage in 2N2222A
Mar 5, 2021 · Note the variants in pinouts (image from Wikipedia): I would also not be totally gobsmacked to see a "2222" made with Japanese-standard E-C-B pinout from some Asian source. …
transistors - How are C (OBO) and C (IBO) defined? - Electrical ...
I'm thinking that in an ordinary grounded emitter setup, where one rather wants to know cbe and cbc, one could approximate it to Cbe = Cibo C b e = C i b o and Cbc = Cobo C b c = C o b o. At least …
Common Base amp gain problem - Electrical Engineering Stack Exchange
Aug 27, 2017 · simulate this circuit – Schematic created using CircuitLab Here's a little schematic I built for my 27MHz colpitts oscillator, which outputs approximately 120mVpp. Since the common …
NPN transistor not switching 12V from microcontroller
Jan 21, 2017 · simulate this circuit – Schematic created using CircuitLab I'm at a complete loss over here. What I'm trying to do is switch 12V voltage with a NPN transistor (the switched signal later …