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15 Threads found on Noise And Zener
I have built this noise source and tried different zeners. I have used 8.2V battery. I cannot notice any noise in the scope. Why it does not work? What kind of noise power should I expect? Think about how zener's work near the threshold with low current. If you AC couple (...)
Yes I thought so, after an afterthought... What if I connect a single crystal after the zener noise source? Will the high Q of the crystal make the noise appear as a single frequency signal? The object of a radio is to tune to high carrier to noise ratios, not the reverse SSB requires filter shape to be matched
Hello. I'm stuck working on a circuit, and I need some advice. I have a protoboarded circuit with a bunch of dual-supply amplifiers, and so it happens that I need a stable adjustable voltage reference that can span a few volts around GND i.e. +/- 5V. I don't need accuracy up to a millivolt, the important part is that the voltage is constant, sta
hello everyone please can anyone help me i need a circuit for a noise generator for pspise that it can give me a randomly noise in a range of frequency and how to attach a power amplifier for it thanks in advanced
Is there any guide line? I put varistor and TVS at the enterance then EMC filter then capacitors then DC to DC converter and bulk and decoupling capacitors but the surge at the power line still passes to microcontroller. Now i will try to use zener diode but the frequency of noise above 1 Mhz (...)
Hey guys, I'm working on designing a noise generator, and I was hoping I could get some info on the characteristics of diode noise--specifically noise in a zener diode operating in reverse breakdown. Here are my basic questions: 1.) What are the characteristics of diode shot noise? (...)
There are projects that produce white noise, and from more than one type of device. Some use an NPN with emitter-to-base operated in zener mode, or a zener diode, or a cheap noisy op amp. This method may or may not be available in simulator programs. There are also commercial chips whose purpose is to generate white (...)
I would recommend this. Slightly more elegant than a zener and resistor. zener wants to be around 9.3 volts. NPN power transistor, heat sink it if you are taking out significant current. If you need low output noise, put a .1 uF in parallel with the zener.
Hi niloy2k, the circuit tries to amplify the noise generated by the reverse biased zener diode. But in order to not saturate the OpAmp and fix the gain, a C in series with a R should be placed between the point with the mark of node 4 and the - input of the OpAmp. The power supply for the OpAmp should be split (+ (...)
i want to use clipper circuit in my low noise circuit. the options are to use zener diodes or tvs. But thier noise dayta 9noise floor, etc0 is not quantified by suppliers nicely. Can anybody guide me pertaining to this?
I don't know the answer, but I would guess - you could use zener diode, or samples of noise(s) recorded into a file. You can also post your question here:
I've seen zener diodes and reverse polarised BE junctions folowed by amplifiers used as noise sources in some simple test equipment (home made). For better performance use a pseudo-random binary sequence (PRBS) generator connected to a DAC. Look in The art of electronics - Horowitz, a chapter is about PRBS generators (...)
i want to use clipper circuit in my low noise circuit. the options are to use zener diodes or tvs. But thier noise data (noise floor, etc) is not quantified by suppliers nicely. Can anybody guide me pertaining to this?
Please suggest some circuits or sites which have info regarding white noise generator. Thanking you all
Look for TL431 datasheet in the web (TI or other manufacturer!), there are several useful hints for your problem like using shunt regulator to control voltage like a zener diode, for this u need a band gap reference a wideband comparator and a NMOS! Maybe useful! also u can use two stage regulator; one for input (...)