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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It seems that you want an AC level transistot diminishes in magnitude as the input voltage increases. This could be read by the ADC easily into ‘sound level’ without much work at all. Imagine that there is nothing else but the below schematic: This is relatively fixed with signal strength. The higher-power 2N is a very similar NPN transistor that can safely switch three times as much current as the 2N If what you want is a sound level sensor, one easy way is to add, after the output cap a circuit called “demodulator” or “peak detector”, easily implemented around a diode and a few passive components.

Then what is the simplest non-IC non-inverting amplifier irrespective of class or common-emitter? Home Questions Tags Users Unanswered.

The 2N is used very frequently in hobby electronics projects, including home-made ham radioscode-practice oscillators and as an interfacing device for microcontrollers. Here’s what I want instead: That means it will go to 1V and come back to 0V.

Yes, but a diode will drop 0. I’m looking to simply read the generic sound level from an Electret Microphone.

Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. However, it will be a sine wave added with a DC value. This is because of the capacitors. This transistor is low-cost, trasnistor available and sufficiently robust to be of use by experimenters and electronics hobbyists. But it is in the middle, which is called the linear region.


An AC signal will be centred on the DC bias point.

2N3904 Datasheet, Equivalent, Cross Reference Search

This means that you will have an output voltage somewhere between 0 and 5 V, depending on the sound level. The common emitter class A amplifier is always inverting even if you use a PNP, the only difference is you invert the power supply polarity.

If you have an oscilloscope, view the waveform on the output. If you do not, try lighting an LED if the analog read is higher than, for example, This page was last edited on 18 Octoberat Unfortunately, this circuit will not generate a DC voltage, if the output is taken on the right side of C2.

But before that, you should understand the circuit. What if we combine the two circuits mentioned above. I understand most of that, thank you. Then, read the analog value on the collector of Q1. Thank you for your interest in this question. In this configuration, the transistor is biased to be in the linear region. How do I make it vary the full 0V to 5V, 0V being ‘quiet’ and 5V being ‘loud’, with everything in between linear? Capacitors do not allow DC voltages pass through them.

Also, wouldn’t the peak detector vary between But someone correct me if I am wrong, but your schematic shows a 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.


Felice Pollano 5 The same value resistors and capacitors, the same 2n transistor, added to the output of your existing schematic, would provide a second inversion. This is what amplification called. Wouldn’t the capacitor do just that, if I then somehow reversed the negative portion of the wave and then smoothed it some?

Perhaps I’d need a diode to not be passing negative voltage to the Analog comparator?

First of all the part with the microphone. It is designed for low current and powermedium voltageand can operate at moderately high speeds. Can you give circuit diagram for this?

As far as I understood, you fransistor 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. But it will probably cost more than use two BJT.

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

It transiwtor like I want the above with an envelope detector, however that would only get me from 0V to 2. R1 is for supplying power that is needed by the microphone and this is called biasing the microphone. Think of a sine wave. Views Read Edit View history. You can use values up to uF. Here’s what I want instead:.

If it was fully OFF, it would be not conducting at all. From Wikipedia, the free encyclopedia.