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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63 views

What is the purpose of the zener diode in this circuit?

Related: What is the purpose of the resistor on this MOSFET's drain? This is a circuit taken from a TI reference design (http://www.ti.com/lit/df/tidr687/tidr687.pdf) to drive an LED matrix - ...
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28 views

Where do you put the gate-protection zener diode in an NMOS H-Bridge?

Do you even include it for an NMOS H-bridge? Because typically I've only ever seen them in NMOS/PMOS bridges, not full NMOS bridges. (Inductive load) The protection zeners would go here right?
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94 views

3v3 Microcontroller controlling a MOSFET that needs 5V

I'm designing a heater controller that has a primary input voltage between 12 and 24V. Everything except the heater runs on 3V3, including microcontroller, LED's, potentiometers and the MOSFET. The ...
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2answers
72 views

Please explain the circuit (current regulator test circuit with Zener diode)

my mind needs refreshing so could someone please help explaining analysis of this circuit. It is used for testing a current regulator (LED driver circuit) ('I' in the image). The regulator current is ...
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3answers
69 views

Fast 220v AC power failure detection

I'm building an AC-Detection circuit. I want to detect when the AC power has failed ASAP so that I can react very quickly. (like 1-3ms should be enough time) This was my first idea. It works in ...
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58 views

Are Germanium Zener diodes still obtainable?

I need a Germanium Zener diode for a shot noise generator circuit. If I am correct, Silicon replaced Germanium for use in diodes and other semiconductors because of the fact that Germanium diodes have ...
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1answer
26 views

Question about the operation of a zener for a rapid relay release

This is a follow up question to Zener voltage selection for relay?. The following image was taken from the previous question I'm trying to grasp exactly what is happening in this circuit. My ...
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36 views

Zener voltage selection for relay?

This question is similar to Zener Diode Selection for Relay but the focus is in how to select the voltage for optimum or near optimum release time. With the circuit below, how does one select the ...
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1answer
49 views

Waveform Clipper

I need help solving this circuit. It's supposed to be a waveform clipper and I already simulated it, however I want to know how the circuit works and so far I haven't been able to analyze it properly: ...
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2answers
81 views

Passive voltage drop from 6V DC to 5V DC for 3W circuit

I plan to put an Arduino onboard of my hub-generator powered bicycle circuitry. Currently, I have a circuit consisting of: 6V/3W AC hub generator (variable frequency and power); Rectifier bridge; ...
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1answer
50 views

What would cause a zener shunt regulator to have Vout < Vz?

I'm restoring a old motorcycle and the headlight is very dim. Upon inspection, there appears to be a shunt regulator. I infer that the part they call the 'regulator' in the diagrams is just a zener ...
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1answer
26 views

Zener diode in stepper motor driver with TPL7407L

In TPL7407L's datasheet, there is a stepper motor driver schematic as below There is a zener diode denoted as "optional". However the 'COM' pin is connected to 'VSUP' directly. The 'optional' means ...
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1answer
51 views

Single input terminal for multiple voltage inputs

I am designing a board for which I want to have single input terminal for voltage. Board is microcontroller based(Atmega328) so the voltage coming to uC(Vcc on picture) should not exceed 5V. How I ...
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1answer
28 views

BZY97C47 zener diode datasheet questions

The BZY97C47 data sheet (I found no direct PDF link) confuses me on several points. I fail to find straight forward information about the maximum allowed forward current from the data sheet. Also, ...
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2answers
77 views

Are my zener concepts wrong?

If a battery of 60v with internal resistnace 4kohm (in series) is connected to a zener diode of v_z=10v in parallel and a load resistance of 2kohm in parallel too, what will be the currents in ...
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1answer
40 views

Passive ringing on PCB causing noise

I have a PCB that is exposed to a sharp inductive-voltage collapse, around 100V/100nsec. The voltage collapse happens when the current through a transorb reaches zero. When this happens, the board and ...
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3answers
151 views

Virtual GND resistor dividor vs zener diode

I was having a discussion with someone about using a virtual gnd for an opamp circuit. One way to provide the VCC/2 voltage is with a voltage divider made of two precision resistors (and a capacitor ...
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1answer
103 views

AVR USB to Serial Converter; Quick Question

I have a TI86 calculator that I've had for over 7 years now. Well I'm letting a lady friend on mine borrow it, and I was going to load it up with some apps for her. And the tradeoff is happening this ...
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1answer
108 views

Reduce power supply voltage

I'm trying to build the power supply described here. R1: 1K8 1/4W Resistor C1,C2: 4700µF 25V Electrolytic Capacitors D1: Diode bridge 100 to 400V, 1.5 to 4A D2: LED Any type ...
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3answers
185 views

Lower Voltage With A Zener Diode

I am trying to lower the voltage from a 9V battery to 5V for use on an Arduino pin. I bought a 5.1V zener diode from RadioShack. Will this do what I want? Do I have to lower the amps as well? It looks ...
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3answers
298 views

Please explain this circuit (CNY70, Zener diode) [closed]

I am trying to build a new (Arduino based) controller for a machine that contains a circuit that uses a CNY70 to detect RPMs in a motor. The circuit takes a 5V input and I accidentally gave it 24 ...
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2answers
66 views

What are the electronics components that have characteristics like Neon Lamp?

Neon lamps have higher breakdown voltage than its operating voltage. When brokendown, it acts like a zener at its operating voltage.
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81 views

Alternative to V divider for high currents

I am looking for suggestions as to how to supply power to a gate drive optocoupler i am using. The supply being used is a 25V (rms) ac supply and intend to supply 10V DC at around 500mA+ from my ...
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1answer
49 views

Voltage regulation vs relative voltage tresholds?

There is a part of my circuit that uses resistance to output a voltage, in which is compared to a voltage threshold to output a digital signal. However +Vcc can vary and any voltages too far from 5V ...
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2answers
222 views

Zener Diode Selection for Relay

I am using a Zener diode along with a flyback diode with a relay in order to speed it up a bit. This works very well but I am currently using a rather over-sized zener from the inventory. For ...
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1answer
123 views

Why use two power sources when designing a voltage regulator using a zener diode

I am currently designing a voltage regulator using a 5V zener diode. I am wondering why some people choose to use two power sources instead of one, what would be the benefits of this ? the circuit ...
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1answer
147 views

What are the correct zener diode and PTC fuse size?

Noob here. I need to add overvoltage protection to a small, portable solar power system I'm putting together. The solar PV array has a loaded voltage in the 23-26v range and an open circuit voltage ...
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3answers
193 views

How a zener and a schottky diodes protect laser diode?

I purchased a strain relief wire SR9C which has a small protection circuit for a laser diode. It says to contain a zener and a schottky diodes which protect the laser diode from ESD. By looking at the ...
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4answers
112 views

Running 3,6V MCU on full 4,25V Li-ion battery

How can I run 3,6V MCU on a fully loaded 4,25V Li-ion battery? Normally the battery would be 3,6V, but on fully charged it is 4,2V, it would kill the microcontroller. Load is 10mA, minimum voltage is ...
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1answer
423 views

LED as Zener: is this a good way to lower the BOM cost?

I had an old AM radio board designed to operate with a 3V CR2032 coin cell. I want to revitalize this old junk with as few parts as possible and convert it into a USB-powered AM radio with a built-in ...
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1answer
124 views

Protecting resistor value for zener diode in parallel with load

I want to select x as resistance for the protecting resistor (upper). The zener diode can hold up to 4A If I was guaranteed to have current through zener lower than 4A, I could consider its ...
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2answers
50 views

Relationship between Zener voltage and current?

What's the relationship between the current flowing through the Zener Diode? I simulated the following for various values of R, and the voltage drops quite a bit with small currents. The 1N750 has a ...
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3answers
287 views

Protecting microcontroller from inductive loads

I'm working on a project where I will be controlling a variety of loads (relay, solenoid, motor) from an Arduino and I'd like to make sure I build in enough protection for the microcontroller and ...
3
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4answers
301 views

Why I=(V(in)-V(out))/R in zener resistor circuit

I am a hobbyist electronics student who try to study "The art of electronics" book. I am having trouble understanding below passage from the book? I am having trouble following what is going on ...
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2answers
228 views

How does a zener protect my microcontroller?

I'm connecting a 12V inductive limit switch for my 3d printer to a RAMPS controller (Arduino-based printer controller). The RAMPS board operates at 5V, and connecting the 12V signal from the limit ...
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0answers
103 views

Why use a zener diode when connecting a OLED display?

So I have this full color one inch OLED display from US Micro Products which has the driver SEPS114A. I am planning to connect it to an Arduino board using SPI, and the recommended schematics from ...
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0answers
118 views

Can a zener diode be used to slow down a fan?

I often use a resistor to slow down a fan in older PC's, because these old computers are too noisy. Can a zener diode be also used to slow down a fan in a PC? As far as I know these small fans are ...
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3answers
116 views

What is the Q-point of the zener diode?

Is the Q-point f the zener diode in figure equal to its breakdown voltage of 4 V ?
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0answers
38 views

Limit amplitude and isolate impedance of a clock signal, without introducing noise

I am trying to drive the clock of a sequential logic circuit from a high-impedance input that receives a clock-like signal of somewhat variable nature from an external source. Input in practice may ...
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2answers
165 views

What is the purpose of a Zener diode added to the output of a SMPS?

I studied circuit diagrams of some computer ATX power supplies. Some of them have got a Zener diode at the very end of 5V stand by line. The picture shows endpoint of the circuit - the SMPS is on ...
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1answer
109 views

Zener diodes in series

Hello, In this problem, i am not able to understand how I2 is getting replaced by I01. More over, will these zener diodes become ON as the applied voltage is less than Vz? Thanks in advance.
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2answers
140 views

Zener Diode Minimum Input Voltage

My question is with regard to establishing regulation using values taken off the characteristic curve. I have \$I_{kn}\$ = 1.8mA and \$V_z\$ = -8.2V. How can I determine the minimum input voltage for ...
0
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1answer
110 views

Use Zener diode to control an LED array?

I am trying to use an LED array to indicate a voltage level. For example, if the voltage is 3V, then 1 LED is lightened up. If 4V, 2 are lightened up. If 5V, 3 are lightened up, etc.. My previous ...
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1answer
403 views

Zener diode circuit

When I tried to find current flowing through 1.2k ohm resistor, I am finding 8.33 mA but there comes the problem: I am finding the current through the 1k ohm resistor is 6 mA. What am I doing wrong? ...
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1answer
109 views

Zener diodes comparison 12V vs 6V2

12V zener diode has the same series as 6V2. It also has same wattage of 500 watt but VZ of 12V. Will it handle the same maximum current IZT as the 6V2? Any proof?
2
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4answers
348 views

Anti-wind up scheme in the implementation of PID controller

I want to implement designed PID controller. But I am facing the problem of how to limit the saturation limit in both positive and negative direction? I tried using zener diode, but I would like to ...
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0answers
147 views

Simplest signal level/clip LED indicator?

I was looking to modify a circuit that would take a signal from a guitar, impedance-match, amplify and bias it so that it would be readable by the ADC of a micro-controller, effectively based off this ...
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0answers
95 views

Zener Diode exercise ,are my solutions correct?

We have \$V_z = 6.8\$ V \$I_z = 5\$ mA \$r_z = 20\$ Ω \$I_{zk} = 0.2\$ mA \$R = 200\$ Ω \$V_s = 9\$ V a) Find the output voltage when we have the input voltage \$V_s\$ with the nominal value of ...
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2answers
266 views

How does R5 bias the zener in this SMPS circuit?

In the description for the circuit below from this data sheet for TNY268 off-line SMPS switcher, it says R5 is used to ensure that the Zener diode is biased at its test current and R6 centers ...
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0answers
45 views

How do I find the maximum surge current of a zener from the given thermal resistance curves?

I'm driving a MOSFET, and I want to protect its gate with a zener diode. Here is the MOSFET data: ...