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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60 views

Small solar panel + ultracapacitor + zener

I am buliding a very small and low power "intermittent" sensor, powered by a tiny solar panel and an ultracapacitor. It works with a voltage from 1.9V to 3.3V, but the transmitted radio range greatly ...
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4answers
68 views

When considering Zener current, is lower current generally better?

I'm creating a small assortment for my parts box, and I wonder about Zener currents. For example, a selection of 4.7V 500mW Zeners spans a wide range of Zener current values: BZX79C4V7 = 5 mA Zener ...
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0answers
19 views

Investigate methods for analog Input Overvolatge fault protection

I have 8 analog input coming from various 5v and 3.3v sensors that have to be interfaced to a 3.3v micro-controller. The main system voltage is 24v-48v , i need to protect the ADC inputs against over-...
3
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2answers
315 views

“A zener with series diode”?

So I'm still reading The Art of Electronics Third Edition. On P.39, when dealing with indicative "kick", I found this sentence: For the fastest decay with a given maximum voltage, a zener with ...
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2answers
40 views

Limiting resistor for zener voltage regulator driven by transistor

I have this circuit: simulate this circuit – Schematic created using CircuitLab And I would like to understand why I need a limiting resistor for the current flowing through D1. I know ...
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1answer
32 views

What decides the response time parameter requirement for zener diode

Assuming that a zener diode is being used to prevent over voltage condition from destroying an electronic component; how does the designer know what range of response time is required when choosing ...
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0answers
50 views

Circuit Partial Failure

We are working on a circuit which appears to be failing during operation due to heat (putting a fan over it keeps it running). We have narrowed the possible parts down to a power resistor and a zener ...
4
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3answers
113 views

With limited components, how do I emulate a reverse-biased zener diode?

I understand that reverse-biased zener diodes don't conduct at all until they've reached a certain breakdown voltage, after which their voltage drop remains constant. I want to use this property in a ...
5
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2answers
76 views

What use is a Zener diode's leakage current spec?

Consider this datasheet for a family of Zener diodes. All of the parts 3V and under have their leakage current rated as some current at 1V. I've seen this is multiple family datasheets, but it really ...
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2answers
428 views

How do zener diodes regulate voltage? [duplicate]

So i read about the Zener diode voltage regulator circuit in the The Art of Electronics book, it made no sense to me, then I read about it in this article which was ...
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1answer
123 views

Can I achieve debounce using a zener diode?

I am interfacing a 4x3 keypad with LPC1778 using GPIO pins. These pins are 5V tolerant. Can I use zener diodes in the debouncing circuit? Can I use zener diodes like this?
4
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6answers
663 views

Rationale for operating the diode in the (reverse biased) breakdown region

For the circuits I've studied thus far involving diodes (which admittedly are not that many), they have been nominally used in the forward-bias mode. For example, the LED only lights up when it's ...
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1answer
174 views

Why is the voltage across a Zener diode so dependent on current?

I was going to use a 3.3V Zener diode to protect the analog inputs of an Arduino Due, but I found that the voltage drop across it was only 2V. So I tested connecting it to my power source with a ...
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2answers
201 views

Which circuit best approximates a zener diode?

Above on the left side is the original zener diode circuit. I want to draw an approximation of this circuit, given the zener voltage Vz and zener resistance Rz (Rz is considered constant for ...
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1answer
95 views

Obtaining dynamic resistance of a zener diode in LTspice

Please left-click to enlarge Above is a circuit where: D1 is a 10V(breakdown) zener diode, V1 is a voltage source which varies from 11V to 5OV DC and R1 is a 1k resistor. My aim is to identify the ...
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3answers
120 views

Square wave at line frequency. How does it work?

I found the following circuit next to a switching power supply in an electrophysiology amplifier (AXOPATCH 200A, an instrument for a technique called "patch clamp"). References to power outlet: L:...
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3answers
314 views

Replacing zener diode with a resistor in current limiter circuit

Can we use a resistor to replace the zener diode in this current limiting circuit ? Why do you think using a simple resistance is not enough to trigger the base ?
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2answers
104 views

Voltage Clipping with Two Series-Opposing Zener Diodes

Theory Schematic for Voltage Clipping with Two Series-Opposing / Bidirectional Zener Diodes Consider the following schematic for voltage clipping with two series-opposing/bidirectional Zener Diodes \...
4
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2answers
415 views

Differences between TVS diode and Zener diodes, in diagrams and in practice?

I have been looking at circuit protection using TVS and Zener diodes. I have seen the following symbols used to represent TVS diodes in circuit diagrams: simulate this circuit – ...
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3answers
81 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 ...
0
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1answer
120 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
172 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
65 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
30 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 Transistor. ...
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1answer
24 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
30 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
226 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
67 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 ...
2
votes
1answer
267 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
134 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 https://www.quora.com/What-is-the-...
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0answers
39 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 ...
0
votes
1answer
114 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 ...
0
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1answer
139 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 ...
0
votes
2answers
63 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 ...
0
votes
1answer
97 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
222 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 ...
0
votes
1answer
62 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 ...
4
votes
1answer
158 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 familiar with ...
0
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1answer
30 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 ...
1
vote
2answers
64 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
364 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 ...
1
vote
1answer
74 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) ...
5
votes
4answers
1k 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 ...
1
vote
1answer
57 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 ...
0
votes
5answers
135 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 that ...
0
votes
1answer
71 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 ...
0
votes
3answers
172 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 ...
0
votes
1answer
161 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
58 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
4
votes
6answers
662 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 ...