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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1answer
39 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
81 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
57 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
64 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
115 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
92 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
54 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
490 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
64 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
95 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
votes
3answers
92 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 ...
1
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0answers
57 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
56 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
178 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
63 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
34 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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votes
1answer
160 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
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1answer
72 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
80 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
85 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
138 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
votes
0answers
66 views

Power enable between USB and AC/DC adapter

I have two voltage sources an USB and an AC/DC adapter 5V-24V. The adapter is connected with a diode and the USB is connected by a power path controller (LTC4412). This IC has an enable pin which ...
0
votes
1answer
104 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
91 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
61 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 ...
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2answers
87 views

Zener diode as a Voltage regulator, where do the formulas come from?

I'm currently studying the above circuit and trying gain a better understanding of it, I found the following forumlas to calculate Rs Max and Rs Min: $$R_Smax = R_L(\frac{V_{in}}{V_z}-1)$$ Which I ...
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votes
1answer
116 views

Simple Regulated Power Supply

I was trying to make a simple regulated power supply using 4 diodes (0.6v), 2 Resistance, 1 capacitor, 1 transformer (15:1), 1 zener diode. My input is 240v 50hz. I have to get 12V 100mA output so i ...
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1answer
221 views

Floating LM317 (used at high voltage) protected by two Zener diodes

In Marty Brown's Power Supply Cookbook, I found the following variation of the floating linear regulator. I'm aware this topic has been discussed in at least one other question; the two-Zener wasn't ...
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votes
1answer
93 views

Can anyone please explain how this Zener diode circuit works?

I am learning how a Zener diode works. Can anyone please explain me how to analyze this circuit (with equation if possible)? Thanks.
2
votes
2answers
73 views

Adjustable power supply simulator/reality

Hi im a student of computer engineering and im currently doing a project of a adjustable power supply it should be doing 0-30V but im getting some problems with the word adjustable haha,i got this ...
0
votes
2answers
72 views

Feedback op-amp voltage regulator help

I have made a voltage regulator: simulate this circuit – Schematic created using CircuitLab And here is the zener circuit: simulate this circuit I have already tried to charge ...
0
votes
1answer
50 views

RS232-TX voltage translator

Would like your help to clear my doubt and confusion for this circuit http://nil.rpc1.org/wordpress/?p=31. I don't get a sense that how possible the RS232-pin3 TX signal is converted and transmitted ...
0
votes
1answer
57 views

Toubleshooting PCB circuit - strange Zener diode behaviour

I have two units of a device which I shall call deviceA and deviceB. DeviceB is malfunctioning. Therefore I compared the resistance values of the same components on the boards of both deviceA and ...
1
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4answers
1k views

Why does temperature modify the characteristics of a diode?

Everyone knows that temperature affects every semiconductor device you can think of, and diodes are no exception. From the below graph, we can see that the temperature has marked effects on pn ...
4
votes
5answers
1k views

Is there any advantage to biasing a transistor with a zener diode rather than a (resistor-based) voltage divider?

In the figures below, we see two methods of biasing a bipolar transistor: the first uses a voltage divider, and the second employs a zener diode regulator. Since the voltage regulator appears far ...
1
vote
2answers
81 views

Unexplained voltage drop in input clamping & buffering circuit

I'm designing a circuit consisting mainly of 74LS series logic. I am clamping and buffering several input signals using a zener diode and a 74HC7014 Schmitt trigger buffer. A relevant excerpt of the ...
2
votes
2answers
105 views

How improve temperature sensitivity of HP 721A DC Power Supply voltage reference?

I have a sentimental affection for my HP 721A DC Power Supply: http://hpmemoryproject.org/pict/wall_a/anim/721a_q90/viewer.htm Rugged, dependable, and roughly as old as I am, it is also pretty ...
2
votes
1answer
179 views

What type of zener diode is this?

What type of zener diode is this? The thin band is blue.
1
vote
2answers
67 views

Transistor not supply enough current

I am trying to run a 100W 32V Led with a DC-DC boost converter from a 6 volt battery, and I want to make it so it will shut off when the battery voltage gets low. So I am using a TIP122 transistor ...
1
vote
2answers
223 views

SMD vs THR Transistor for Relay

Designing a Relay control from a MCU's GPIO, there are some requirements to take into account. Coil Voltage: 3V Coil Resistance: [36-45]Ohm Relay Voltage: 250Vac // 30Vcc GPIO Voltage: 3V3 Max GPIO ...
0
votes
1answer
187 views

MOSFET gate protection zener diode math .please help

My circuit's voltage input can range from 6V to 12.6V. I want to use a p-ch mosfet for reverse bias protection. However, the FET I want to use has a maximum VGS of +/- 8V, so I have to protect it in ...
2
votes
1answer
531 views

What is the purpose of transistor in this circuit?

"A zener diode voltage regulator is inefficient when the supply is used with equipment that draws high current. When a supply must deliver a lot of current, a power transistor is used along with the ...
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1answer
274 views

Explaination of high current zener transistor regulator circuit

This is a high current zener TRANSISTOR regulator circuit. I want to know What does "high current" mean here? How is this circuit working as a zener regulator? What is the purpose of transistor ...
0
votes
6answers
304 views

3V6 Zener Diodes With Very Poor Accuracy

I have a question about the regulation accuracy (or lack of) of a 3V6 Zener diode. I wanted to confirm that I wasn't doing anything stupid. I set up the standard test circuit shown below. No ...
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votes
2answers
158 views

Can this circuit be called a 12v,5A zener regulator?

If this circuit can be called a 12v,5A zener regulator, then I know that 12v here is the varying input voltage. What is the 5A current here,I mean where can it be represented in the picture?
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0answers
89 views

How can I add redundancy to the flyback diode protection across an inductive load?

Dear StackExchange users, I want to add redundancy to a flyback diode system that is protecting an N channel MOSFET from flyback of an inductive load but I don't know how to accomplish this! I am ...
1
vote
1answer
164 views

How different is the performance of TVS vs Zener diode in flyback protection

So far I know that it is possible to protect a Switch, MOSFET, Relay from flyback with different kind of diodes: One diode: It is simple but it affects the speed of valve One diode + a resistor: ...
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votes
1answer
38 views

Zener voltage resolution at fixed current and load?

Under a fixed optimum current and negligible load (ie being used as a reference into an opamp) how steady is the voltage of a smoothed zener? The scenario is a zener carrying a current of 5mA in its ...
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1answer
52 views

Cant figure out a solution for 27V, 3A supply

I have a pretty weird situation I need to produce 27V, 3A from a supply of 27.5V, at first I thought of using a zener as the voltage regulator but I could not find a zener of over 81mW, with zener as ...