Questions tagged [diode-clamp]

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35 views

This clamping circuit output is -ve compared to what is expected?

Clock Pulse of Vpeak =10. Providing that the first cycle is -ve why does the output in first is -20 then 0 then -20 and so on? I expected it to be 0 and 20.
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1answer
40 views

Polarity of input signal and capacitor in voltage clamper

I am stuck at understanding how voltages add up in a voltage clamper, reading through Learning About Electronics - Diode Clamper and All About Circuits - Voltage Clamper, and also YouTube a few ...
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1answer
40 views

Buck regulator maximum supply voltage VS. voltage spikes at input where we have a TVS diode

Currently I'm using a buck switching regulator AOZ1284PI of Alpha & Omega Semiconductor to generate a 5V supply from a 12V input of a lead-acid sealed battery, and I plan to use AOZ1284PI again on ...
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2answers
32 views

How is dc restorer circuit used for PWM demodulation/detection?

In the Microelectronics Circuits textbook by Sedra & Smith, it is said that: As an application, consider a pulse signal being transmitted through a capacitively coupled or ac-coupled system. ...
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1answer
42 views

Ethernet POE voltage measurement to determine Voltage clamping between line ot Ground

I am planning on using a tvs diode to clamp power peak to protect network switch; the Port is POE. The issue is that when I measure the voltage of ethernet line to ground, I get around 0.6V. When I ...
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1answer
149 views

How to choose the correct TVS diode and how to size it?

So I was thinking about transient suppression and I found TVS diodes. I was wondering how to choose the correct TVS diode since they have 3 voltage parameters: Vc --> clamping voltage, voltage I ...
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1answer
61 views

Designing a clipper circuit

Design a clipper circuit using 1N4148 general purpose diodes and a R = 1 kΩ to clip input signal voltages that are above 5.7 V or less than −0.7 V. Below is my schematic in which Vo<=Vdo + 5V and ...
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1answer
92 views

resistor placement for zener diode for over voltage protection

i have searched in over voltage protection (like mosfet ) , i wanted to use zener diode parallel so it wont dissipate power unless in over voltage protection , but its power is low so i read that i ...
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0answers
42 views

RC differentiator negative voltage clamp for comparator protection

I am building an RC circuit with the capacitor on high side and resistor at ground, connected to a voltage comparator. simulate this circuit – Schematic created using CircuitLab I saw this ...
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1answer
71 views

Voltage clamping for nixie tube driver

I want to design a nixie clock based on a high voltage shift register: the HV5530. I don't what to multiplex the tubes to avoid loss in brightness. My idea is to leave the anodes powered all the time ...
2
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1answer
71 views

Clamp a D/A to prevent output below 0V

I am using a USB D/A converter to drive a high-voltage op-amp with a signal between 0 and 3V at 10 kHz. The D/A I am using is capable of outputting between -10 and +10 and unfortunately seems to ...
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1answer
191 views

GPIO over voltage input protection

I want to design a circuit that can protect GPIO of the microcontroller from high voltages.the GPIO connects externally to mechanical switch. So my approach was to use zener diode to clamp the high ...
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1answer
740 views

Analog input over-voltage protection using Schottky and Zener Diodes. Can it work?

I'm developing an analog input module based on TI's ADS8668 and want to protect the input channels from over-voltage. According to the datasheet, each analog input channel withstands voltages from -...
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0answers
112 views

ESD Diode - clamping voltage

I'm trying to replace an existing ESD diode(PESD1CAN) in my application CAN circuitry due to some reasons, I've found an alternative ESD diode(RSB27C2), but compared to the diode that I already have ...
3
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1answer
222 views

How do I size a zener diode for use as a freewheel diode for a ZVS induction heater?

My electronics experience is "hobbyist" and I'm in some new territory with this question, so forgive me if this question turns out to have an easy answer or prove to be dumb. I have a basic ZVS ...
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1answer
145 views

Over voltage protection for a buck controller 24V in. 4-5V out

Please see Image below, if the output votlage here is 4-5V with current out 3A-15A(depending on LOAD). Could I stick a Zener diode to clamp any over voltages to protect the load from over voltages? ...
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3answers
154 views

Over-voltage protection system for a 7 - 20 A Load with 4 - 5.5 V output from PSU

The power supply used on the product, is a DC-DC buck controller 24 V in (3 - 5.5 V out). I need some suggestions to help protect a load (LED Display) which draws roughly 5 - 15 A the power supply on ...
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2answers
127 views

Question about diode clamper

I have 2 problems with diode clampers that I don't understand First, in this circuit for example: In the positive half cycle, the voltage across the diode is the diode drop of 0.7 V Then the ...
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2answers
206 views

How does diode clamp protection work?

I am not able to understand how diode clamp protection works. Considering the diode clamp protection as shown in Figure 1: When the input voltage (Vin) becomes more than power supply voltage (Vss = ...
1
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4answers
519 views

Clamping negative voltage on comparator input (LM393)

I need to compare a AC voltage against a reference voltage. I'm only interested in the positive part of the cycle so I need to clamp the negative part of the cycle to protect the comparator input. I ...
0
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1answer
66 views

During DC restoration of a video signal how is the first sync pulse detected?

DC restoration of an AC coupled video signal can be performed by clamping to some reference voltage, during the horizontal sync periods of the video. This all seems fine in a running system, when the ...
0
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1answer
183 views

If you were to add “DC offset” with a clamp, can you easily remove it afterwards?

I don't have a circuit right now, but let's say you wanted to add DC offset to a signal (ex. to prepare a signal for an Op amp stage) but then afterwards center that signal on 0v. Is this possible ...
1
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0answers
162 views

Use of DC source in Zener clamping circuit

A question in my engineering degree asked me to design a clamp circuit that gives a 10V 50Hz AC signal a +5V DC bias. I designed the following circuit as my answer: I assumed 0.6V forward drop for ...
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1answer
1k views

12V 12A resettable crowbar circuit

The idea is to protect the input stage of a control card from improper power supply connection. The power supply is a standard desktop AC-DC power adapter (Meanwell GST160A12) with inbuilt shortcut, ...
0
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2answers
178 views

Diode clamp circuit question

I understand the use of diodes as switches or "clamp circuits", however I needed a little clarification in this diagram, taken from the site https://www3.nd.edu/~lemmon/courses/ee224/web-manual/web-...
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2answers
120 views

OpAmp clamping circuit not working for a Pulse voltage reference in PSpice

So, we had an analog electronics lab exam today where we had to generate a waveform: I wrote the PSpice code, using a clamper circuit (in hindsight a summer was the best option, but whatever). The ...
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4answers
444 views

Learning the Art of Electronics - diode clamp

Working through Learning the Art of Electronics, Hayes T, I'm stuck trying to build the diode clamp in Figure 3L.7 on page 137, as below: The text says to, "Drive it with a sinewave from your ...
12
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3answers
2k views

12 V input on 3.3 V GPIO, TVS pulled down or Schottky pull up?

I am building my own PLC that has to accept permanent inputs of up to 30 V DC into a STM32F with 3.3 V inputs. The switched input will have to work with 8-30 V, but 90% of the time the ...
1
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1answer
618 views

Principle of diode in DRL AND gate

The explanation (from https://en.wikipedia.org/wiki/Diode_logic) states that R is connected to +12 volts to provide the forward bias current for the diodes and current for output drive. If all ...
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0answers
128 views

Conceptual confusion about voltage multiplier circuits

I can do circuit analysis of the half-wave series multiplier (also called Villard or Greinacher cascade or Cockcroft-Walton multiplier) and see that it works, but I have several conceptual confusions ...
1
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1answer
187 views

Clamper for easy DC-restore in video-composite

I'm unsure how to properly design a simple clamper in a video circuit like this: The capacitor should be there to avoid any DC offset flowing into the X1 primary loop. I don't know if I can treat the ...
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2answers
208 views

What is the difference between clamping a input signal at X volts and clamping a input signal by X volts

I know that the total swing of the signal remains the same.I don't know how the circuit will be designed when it's asked to clamp the signal at X volts. Will the lower peak be at X volts? Or the ...
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2answers
588 views

Clamping diode between supply and output of an opamp

I am trying to create a test board for Apex MP38. I am following their own evaluation kit design and noticed there are 2 clamping diodes between the OpAmp's output and the positive and negative rails: ...
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3answers
1k views

Internal clamping circuit at the input pins of an MCU

I understand that the internally two diodes exist at the input of a microcontroller and one end of it is connected to Vdd and the other end of the second diode is connected to ground and when the ...
2
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3answers
3k views

Connecting DIODE in relay circuit

Am a very beginner with electronic circuits and its components.. Im trying to turn on my water pump using Arudino nano. Ive got 25A solid state relay for that purpose. So according to little info I ...
2
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1answer
600 views

Voltage Multiplier Circuit Problem

I have gone through Volatge multiplier circuits like, doubler ,tripler, quadrupler. And seem to understrand circuits like them shown in the figure. With these in mind, I find it very difficult to ...
2
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1answer
1k views

What's the difference between Clamper and Rectifier

I have a doubt that instead of rectifier we can use positive clamper to get the DC voltage at output, because the clamper adds the DC voltage to the AC signal, but even the same thing is done by the ...
3
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2answers
992 views

Short circuit protection for digital input

In my question here: Review of my first ever PCB design for a watering control robot. it was pointed out that I should probably protect the LEVEL_ALERT line. So ...
1
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1answer
417 views

Is clamping a valid termination strategy?

This application note seems to suggest that for high-speed signals clamping diodes can be used to deal with overshoots instead of termination: To manage signal integrity issues and protect the ...
1
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1answer
122 views

Is the circuit a voltage doubler or not?

I'm not able to actually understand how the circuit behaves as a voltage doubler.From my understanding the circuit would behave as a voltage doubler if during the positive half cycle only D1 would ...
2
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1answer
1k views

Determining Dynamic Resistance of TVS Diode from Datasheet

I'm trying to determine the dynamic resistance of TVS diodes so I can calculate clamping voltage and peak current for a given input pulse (automotive load dump). This app note(1) from ST provides a ...
1
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3answers
1k views

Dealing with voltage spikes in BLDC motor drive

I drive a BLDC motor with an ESC. When using power from a LiPo battery everything works as expected. When I use a power supply, on rapid stops or slowdowns motor generates voltage spikes, which send ...
1
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2answers
573 views

How to remove the negative component of a sine wave?

The following is the schematics of a simple circuit I'm working on, It filters and amplifies an electret condenser microphone's signal to get an output ranging from 0 to 9V (to drive an equalizer like ...
5
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3answers
583 views

My IC keeps blowing up - PAC1720 current sense IC

I am using a PAC1720 current measuring IC to measure the current/voltage/power being delivered to a lead acid motorcycle battery that is being charged. Here is a newer datasheet and an older ...
1
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3answers
132 views

Circuit for connecting externally power instrument to MCU

I have externally powered instruments that I need connected to the ADC inputs of an MCU. They output 0-5V analog, and the MCU accepts 0-3.33V. There is no guarantee of the voltage difference in ...
0
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1answer
729 views

Signal buffer with op-amp clamping and voltage bias

I'm new to EE and have a question about signal buffering. I'd like to use two brief paragraphs to give some background and context. I live in the SE Asian country-side. Mains supply (230VAC 50Hz) is ...
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2answers
268 views

Art Of Electronics - Bypass capacitor across D1 in Figure 1.82

In the below picture, I am struggling with the text, in parenthesis, that says "You could similarly add a bypass capacitor across d1 in figure 1.82" Can someone explain this to me? What is the ...
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0answers
117 views

Identifying a input protection diode from a power supply by a photo

block schematic is . And connector photograph is . and broken element is . It seems to be TVS (Transient Voltage Suppressors) diode. Maybe, %20 unidirectional. Because, there is a mini hole in ...
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1answer
333 views

Working principle of clamped circuit with finite load resistance?

Please help me understand the output waveform for the clamper circuit to the following input. i do understand without load resistance, but with load resistance i cant seem to work it out
1
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1answer
2k views

Simple overvoltage protection

I'm looking at a very simple method for overvoltage protection of a load connected to a standard external switching power supply. The load is powered by a 12V power supply, but this could be mistaken ...