An effect in semiconductors, the name of a diode that uses that effect and more generally any diode that has similar characteristics to a zener diode. Zener diodes have the unique characteristic of a reliable reverse bias breakdown voltage. Often used as simple voltage regulators or level shifters. ...

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3answers
55 views

Zener Diode: Easing the load on a regulator

Summary: I am using a LM317 to drive a liquid pump that draws 1A. Unfortunately my regulator is dissipating way too much power and getting too hot. Currently my input voltage to the regulator is 12V ...
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1answer
99 views

Need To Understand Transistor Based Led Circuit

Which Transistor Topology Is Used in the Below Circuit & Why? Need to understand the purpose of zener diode (ZD2) with 12.5 Vz and R1 with 2k value? Why C1 & R2 is used for Q1 transistor? ...
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3answers
87 views

zener diode protection on input of op amp?

I saw a zener diode protection circuit on an Arduino analog pin, and it had a 1k ohm resistor in series. I want to protect an op-amp, and I don't see why I need the 1k resistor, so the question is ...
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2answers
55 views

Cut off low voltage lithium battery?

Working on a portable boombox powered by four 18650 Panasonic NCR 3400 mAh cells in series. I bought a PCB and I have a small 4s balance charger. The PCB will be secondary if anything fails and cuts ...
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1answer
27 views

AC circuit to act as a relay for another DC circuit

In this circuit, I have caused an AC current to power the gate pin of the Thyristor, which in turn should allow the 10v DC current to pass even after the AC current inverses - it is not a ...
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1answer
18 views

Zener VI Characteristics, noise reduction

Consider RIN = 1K, VI=9.5, vi=50m, given Zener characteristics by the graph. I have to find VO(DC output) and vo(small signal output. Case 1: RL = 2k for DC voltage : ...
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2answers
29 views

Zener V-I and V-T dependence

It's known that forward drop of diodes has exponential V-I dependence, and -2mv/°C V-T dependence. But what about reverse drop of Zener?
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2answers
148 views

what will happen at output current ? when two zener diode is in series? [closed]

"what will be the output current when we connect two zener diode in series " simulate this circuit – Schematic created using CircuitLab ?
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1answer
66 views

Why might a rectifier circuit not behave as expected?

I'm building a power supply for a guitar amp in order to replace the poor quality PS/amp circuit that it had initially. And after much deliberation and simulation this is what I designed: Output is ...
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1answer
242 views

Voltage regulator using bipolar NPN transistor

I came across a circuit, and I got some questions about it. What is the reasoning behind using the NPN-transistor? What part of the circuit draws the most current?
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1answer
76 views

What is the difference between rectifier/signal diode and zener diode?

I need to caution: I'm absolutely beginner in electronics! :) I'm stacked with the difference between rectifier and zener diodes. I've already read all the answers at ...
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0answers
19 views

Zener diode in LT3652

I am designing a circuit for a battery charger using the LT3652 chip. The datasheet states that the BOOST pin - BOOST (Pin 11): Bootstrapped Supply Rail for Switch Drive. This pin facilitates ...
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1answer
93 views

How do you solve for current through a zener diode once it has reached its zener voltage?

I am doing test prep for an exam tomorrow and ran into this problem. The question asks you to plot Vo in terms of Vs. It also provides information that the zener diode is ideal and that its zener ...
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1answer
100 views

Confused about battery voltage warning circuit with PNP transistor and Zener diode

Below is a circuit where an LED will light on when the battery voltage (Vcc) is below approximately 8.8V. However, I'm confused as to how it works. My understanding is that when the battery voltage is ...
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2answers
53 views

How to size a resistor for use with an unmarked Zener Diode?

I want to design a simple voltage regulator circuit using a zener diode along with a resistor to protect the diode from excess current. This is the classic zener circuit you see everywhere. The ...
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1answer
84 views

Can I put a zener diode *before* PTC to protect the supply?

I'm designing a small module that takes power from USB and provides it to a breadboard for prototyping. My target audience will just be hobbyists so I want to include some protection. I'm more ...
4
votes
1answer
122 views

How to model a noisy Zener diode in LTSPICE?

I'm trying to simulate a white noise generator of the Zener diode style. I'm going with current amplification, rather than the more traditional voltage amplification just because. My problem is that ...
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0answers
67 views

Zener diode,Mosfet protection

I am building a circuit in order to see how to protect a power mosfet with a zener diode. This is my circuit: I have used a 560 uH inductor, 28 V zener Diode, 1K ohms resistor and a square wave ...
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1answer
55 views

Is it possible to design a 4-pin to 24-pin atx molex converter?

first of all I am a real novice in electronics but according to my circuits and electronic classes I think this should be possible: I want to use a 4-pin ATX cable as a power input in order to ...
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1answer
135 views

What is the purpose of transistor and zener in this circuit?

simulate this circuit – Schematic created using CircuitLab (simulation will not be correct because the diodes are added just by its name.) Hello, I am a student who is not really ...
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1answer
26 views

Logic behind Zener regulator conditions

My electronics textbook says the following regarding a voltage regulator with a Zener diode: For proper operation of this circuit, the diode must remain in the breakdown re- gion and the power ...
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2answers
47 views

Voltage divider or zener clamp when coupling a comparator output signal to a DAQ?

As shown in above figures above, a comparator is outputting 16V pulse signal when it is ON. For some reason I want to lower this voltage around 8V pulse. In Config 1, it is coupled to a voltage ...
4
votes
2answers
277 views

Zener Diode for overvoltage protection

I am considering to use Zener diode for over-voltage protection for a digital input pin. The absolute maximum rating for the typical IC pin is given as from (GND-0.3V) to (VDD+0.3). I can use Zener ...
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1answer
67 views

Choosing series resistors for zener diodes

I'm planning to clamp an AC 12V volt signal with two 8.2V zeners (1N5344B). After the zener couple the signal will be fed to an opAmp as in the figure below. Do I need a resistor (Rz in the figure) ...
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4answers
777 views

Is using Zener diode with a voltage divider sensible?

I need to convert a floating 12 V voltage to more or less stable 3.3V. So I bought the appropriate Zener diode. Now, since there's such a difference in voltage, I want to make Zener's life simpler and ...
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1answer
49 views

audio circuit: zener clamp

I'm thinking about using this circuit to update an old Hafler amplifier. But, I'm curious about the purpose and configuration of the zener clamps in the circuit. I added the red box in the circuit ...
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5answers
114 views

What am i missing for this to work? (Zener Diode)

Since the zener breakdown voltage is set to 5v, i actually thought that the voltage would be 0, since it goes directly to ground, I just wanted to try a "simple overvoltage protection". How is it ...
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0answers
91 views

zener diode as rectifier in cheap mobile charger

Opened a very cheap mobile multi charger and find a zener (4.8V, 1/2W) diode is used as rectifier. Surprisingly it is giving ~ 4.9 V when no load and about 430mA to an old 3.8V torch bulb, almost ...
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1answer
66 views

Is this something a P.L.C. would be able to do?

I wish to replace the zener diodes with a programmable chip, so that I can program the chip to do exactly what the zener diodes do in this circuit. This will then make the circuit universal to all my ...
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3answers
142 views

zener diodes, different voltages, and using a relay to control its opperation…will this work?

Ok so I am going to admit that I am an idiot when it comes to circuits. However, some advice would be appreciated with regard to my idea. I am trying to control two seperate circuits, each with ...
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1answer
125 views

How to PWM-drive a N-channel non-logic level power MOSFET with a 3.3V signal?

Follow-up of Using IR21531 as a simple 1 channel gate driver After doing the above question (I'm very sorry, beacuse my question seems a XY one), I'll try to explain better what I believe that I want ...
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2answers
56 views

What is the function of this opamp circuit? [duplicate]

Hello ladies and gentleman, I'm trying to figure out how this circuit works : I was thinking it is a kind of charge controler where Rx is the load. Any help would be pleased
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6answers
565 views

Can I use a Zener diode to convert 14 V into 5 V in a small-current circuit?

I'm working on a microcontroller-based device, and I need it to detect an input voltage (distinguish between zero and non-zero). When it's not zero, it can be anything between 10 V DC and 14.6V with ...
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1answer
74 views

EDIT: Dropping voltage of high frequency signal using diodes

I have a high frequency analog signal that has to be as noiseless as possible, say no ripple of a few millivolts? Now, I need to bring it down by almost 9V. Is it reasonable to simply use a zener or ...
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2answers
168 views

Identify Zener diode

I need two 5.1V Zener diodes for a small project. My knowledge in electrical engineering are severely limited, but have some boxes with components that I have taken from various electronic equipment. ...
2
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3answers
115 views

Zener and Common Diode in series [closed]

I was looking at a Diagram, and I saw that a relay uses a Zener diode and a common diode in series between the coil ends. In the past I've seen a common diode being used in order to protect the ...
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0answers
63 views

Is a Zener and a fuse enough protection?

We have a power chain that runs from an alternator, to a 24->12 dc regulator, to a battery charging circuit, to a 12 v battery. We were thinking of using this circuit minus the ac-dc converter part ...
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1answer
59 views

Biasing an NMOS to get rid of \$V_{th}\$

So here's a common way of cancelling out the \$V_{th}\$ in an NMOS. Am I better of use a good quality zener (in series with a resistor) or stick with voltage divider R1 and R2 below. Assuming we can ...
6
votes
1answer
192 views

Multiple diodes, or single Zener diode?

In the datasheet for the MAX15500, it says I need to use several diodes in series: ... to ensure a voltage difference of 2V to 3.5V from AVDD to AVDDO and from AVSS to AVSSO. Is seems to be ...
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votes
2answers
69 views

Noise problem using zener protection on precision analog inputs? [closed]

I have a circuit input that I need to measure down into the nanovolts, so it gets fed to a 24 bit ADC via some buffer amps. However, in order to protect the circuits from overload I am thinking of ...
0
votes
1answer
41 views

Where to get stabilitron voltage current characteristics

I am reading Art of electronics of Paul Horowitz. Here is in 1.06 chapter is given is computation of voltage drop on zener diode while applying different voltage sources to them. So I wondered where ...
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1answer
360 views

Zener diode in comparator [duplicate]

I am designing a comparator circuit based on a simple opamp (not a dedicated comparator). But, I read that using an opamp as a comnparator is foolish and undesirable. Why so ? A comparator is nothing ...
0
votes
1answer
86 views

High power equvalient for a zener

Sometimes the power rating of a simple zener diode is not enough for some works, but their precious ability is needed. What to do? put two zeners in series? I heard that it will work in theory but ...
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0answers
62 views

Stabilize Vds with a clean voltage reference

I suppose we can simply stabilize V_ds using a voltage reference, like a zener diode (a very clean signal one) to stabilize a MOSFET and keep it from swinging it's Vds and therefore the Id and ...
1
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1answer
140 views

Finding output values in a circuit with a zener diode in parallel with a resistor

Find Vout for all possible values of Vin. In this problem, Vf is the forward voltage drop across the diode and Vr is the reverse voltage drop across the diode. (You must break the problem into 3 ...
1
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1answer
106 views

Power effeciency of Zener diode regulator

How to calculate the power efficiency of zener diode regulator? Is it correct to calculate it as the ratio of power delivered to load to the total power drawn from input source? If I am correct, ...
3
votes
1answer
161 views

Check for if I've picked the correct flyback and zener diodes for a solenoid valve driver

I want to use an arduino power driver shield which contains the RFP30N06LE MOSFET to drive the 12V version of a solenoid valve which has a power consumption of 2.0 Watts (so 167 mA current draw I ...
0
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1answer
134 views

Clarification about AC and DC coupling on oscilloscope

I was measuring voltage on zener diode and found unclear behavior of oscilloscope. So I have function generator which puts saw wave(or sine, doesn't matter) of 20 Vpp. It goes through 1k resistor to ...
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2answers
107 views

Inverter with capacitor and Zener diode?

Why author of this circuit used capacitor and Zener diode (see the part marked in red below)?
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2answers
63 views

What “LE3CA” component is?

After plugging the device to the wrong power supply, it doesn't work anymore. When I plug the good power supply, the alimentation voltage drop to 0V and the component LE3CA is really hot (shortcut ...