2N Datasheet, 2N NPN General Purpose Transistor Datasheet, buy 2N Transistor. Part Category: Transistors Manufacturer: Vishay Intertechnology, Inc. Description: Small Signal Bipolar Transistor, A I(C), 40V V(BR)CEO, 1-Element, NPN. December, − Rev. 4. 1. Publication Order Number: 2N/D. 2N, 2N 2N is a Preferred Device. General Purpose. Transistors. NPN Silicon.

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In this configuration, the transistor is biased to be in the linear region. It seems that you want an AC rransistor which diminishes in magnitude as the input voltage increases. Capacitors do not allow DC voltages pass through them.

As far as I understood, you are trying to make some kind of a sound level detector, which will let you detect if there is a sound with a certain volume or not. It will generate an AC voltage.

2N Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

This is because of the capacitors. Here’s what I want instead: If you use an audio transformer instead of a capacitor you could change the signal phase as you please.

IF you are talking about DC levels the question is still unclear. By using this site, you agree to the Terms of Use and Privacy Policy. Joan 5 6. The Arduino has 6 analog inputs, which read for 0V-5V.


You can do this with minor changes to the schematic you have. Perhaps I’d need a diode to not be passing negative voltage to the Analog comparator? But it is in the middle, which is called the linear region.

2N3904 Datasheet, Equivalent, Cross Reference Search

However, it will be a sine wave added with a DC value. This means that you will have an output voltage somewhere between 0 and 5 V, depending on the sound level. AC is what I’d be looking for gransistor, right?

Thank you for your interest in this question. If you take a car siren and put it near the electret microphone, it will be a sine wave from with transiator peak to peak amplitude of 5Vpp with a frequency of about Hz. Commons category link is on Wikidata. A biased electret microphone with a capacitor will output small changes with respect to sound.

That means it will go to 1V and come back to 0V. The transistor will 2n094 these small changes so they can be viewed easily:.

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But remember, we had some biasing to it which is a DC voltage. The transiator value resistors and capacitors, the same 2n transistor, added to the output of your existing schematic, would provide a second inversion. But someone correct me if I am wrong, but your schematic shows transistorr simple biased amplifier, so you would really have 2. If this is not the case, can you please explain “I’m not looking for a logicthe Arduino’s analog inputs have a bit ADC that gives for 0V-5V, respectively” in this context.


Simply invert the output a second time, transostor a 2 stage amplifier. When there tranaistor a whisper, the peak to peak amplitude will be about 1Vpp with changing frequency because of the speech. The 2N is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. However, my comment above ignores the DC offset. After getting results, just make an if-else condition in the software depending on the ADC value that you read.

Maybe you should try to make the supply voltage 5V. Ehryk Yes, you can add an output capacitor and an envelope detector.

What you’ll have at the output is AC, a capacitor blocks DC. But it will probably cost more than use two BJT.