How do I know if which leg is the emitter or the collector?
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 …
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 …
Simple circuit works with BC547, but not with 2N3904
May 27, 2023 · 19 The transistors can be used interchangeably and exchanged, yes, but they don't have the same pinout. BC547 has CBE and 2N3904 has EBC.
Wrong footprints in KiCad - Electrical Engineering Stack Exchange
I am designing an audio amplifier and I realized that the footprints that came with KiCad are wrong. I connected the transistor Q9 like this: But in the CvPCB, the transistor appeared like …
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 …
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. …
Finding the Base-Emitter Voltage in an NPN Transistor
The problem asks to find the the real value of base-emitter voltage, VBE V B E and the corresponding IC I C, and VOUT V OUT in the figure below: VCE(sat) V C E (sat) is given but …
Common Base amp gain problem - Electrical Engineering Stack …
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. …
voltage - Calculation of the capacitor value across the base and ...
Oct 10, 2020 · Your title talks about a base-emitter capacitor, but you show a base-collector capacitor, which is it? What is the application of the circuit, and the reason to 'avoid turn on'? …
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 …