Questions tagged [diode-clamp]
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97
questions
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1answer
45 views
Zener diode - Zener voltage vs reverse voltage specification
This may be a very simple question with a straight-forward answer, but I cannot get a clear answer on this.
Consider the following Zener diode. The table on page 2 lists a column for Zener voltage \$...
5
votes
1answer
52 views
TVS diode specs - clamping voltage lower than breakdown voltage?
Having read this app note (and a few others) and quite a number of TVS datasheets, I came across one that is bugging me a bit.
All of the TVS datasheets that I have read so far describe the the ...
0
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2answers
24 views
ADC Clamping Rrotection Circuit with Dual serial Diodes - Formula proof
I am trying to undestand and calculate why in the first circuit we measure 5.7Volt (if forward noltage diode is 0.7Volt) and not 12V. I used the Superposition Theorem which first I replaced the Vcc ...
0
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1answer
30 views
Troubleshooting DTL NOT gate circuit design
My guide says that the following diagram is a DTL NOT gate. Its output is a LED.
For learning purposes, I tested it via a simulator. The measured current is not really significant to power on the ...
0
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2answers
42 views
DRL AND gate circuit design
I have a guide stating that the following diagram represents a DRL AND gate:
Suppose that both A and B have 5-V inputs with a corresponding switch. I tried to simulate it for learning purposes and ...
0
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1answer
100 views
Is there any way to have a diode that have very small resistance from reverse path?
I'm trying to find a way so I will always have close to 0V at the measurement point (above the diode), when I have 0V as input. ...
0
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1answer
98 views
Do they make anti-parallel diodes in 2-lead packages?
Sometimes diodes in an anti-parallel configuration are used on the inputs to high-gain instrumentation amplifiers in order to protect against large differential voltages.
Does anyone know if the ...
0
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2answers
68 views
How do I create a secure clamping circuit?
Clamping is good for transients, e.g voltage peaks. But two issues with clamping is that if you have a linear voltage regulator attached to 3.3v and 3.3v is the voltage regulator output, then that ...
0
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0answers
42 views
A circuit that can clip a high voltage/ low current signal input to an Esp32?
I have a program for an Esp32 development board which detects the ignition spark from an engine and converts the frequency of the ignition to an engine RPM reading. The high voltage input peaks at ...
0
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0answers
57 views
Feedback on converting signal from 3.5mm jack to ADC on STM32 Bluepill
I'd like some feedback on my circuit. My goal is to convert an audio signal coming out of my laptop's 3.5mm jack (using a sin generator at max volume gives me about a ±1.5V wave) to digital using the ...
0
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2answers
70 views
Is ADC over-voltage protection needed when input isn't external?
In a situation where an ADC is measuring an internal voltage node rather than an external input (where one has little control over input voltage), does one need to implement some over voltage ...
3
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1answer
429 views
How to create an LTspice model for 1N4733A Zener Diode?
I'm new to LTspice. I'm using EveryCircuit as a crutch and would like to run my circuit simulation in LTspice to compare simulation results.
I've built a basic circuit to understand how a zener diode ...
2
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1answer
182 views
Can I assume input protection diodes in all modern ICs, even when not mentioned in the datasheet?
I use the A3906 motor driver on a board supplied by 8V. The µC on the board is supplied by 3.3V and is connected to the A3906 via the logic pins. I realised this is a potential pitfall, when supplying ...
1
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1answer
90 views
Clamper Circuit Without A Resistor Analysis
simulate this circuit – Schematic created using CircuitLab
We were given this clamping circuit and were tasked to plot Vc and Vout for varying input. The only given quantities are the forward ...
1
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3answers
79 views
Best design practice for relying on IC input diode current clamping?
I have a question about what the "best design practice is" for using ICs with current clamping diodes. Take for example the following IC: CD74AC251M (datasheet : https://www.digikey.com/...
0
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1answer
70 views
How do these Zener diodes limit the maximum voltage seen by other circuit components?
This schematic is given in Texas Instrument's AN-1533 Application Note (Over Voltage Protection Circuit for Automotive Load Dump)
On page 4, the author says that the D3 Zener prevents the cathode of ...
1
vote
1answer
72 views
Use of clamp diode in ULN2003A
I'm planning to use a ULN2003A 7-channel Darlington driver (datasheet) to control 4 to 7 LEDs in common-anode configuration from a Teensy MCU:
(The "trident" is a common-anode RGB LED).
The ...
0
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2answers
64 views
How to select clamping diodes
I have a current sense amplifier (TI INA303, the 50V/V gain version) that I want to read with a microcontroller. I've looked all over the place trying to find how to select the proper clamping diodes ...
0
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3answers
101 views
Class C Amplifier: Calculating the base resistor
I've built a Class C amplifier for educational purposes and believe I understand the major concepts on how it works. The only piece I'm struggling with is how to calculate for the base resistor. From ...
0
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1answer
44 views
USB supply protection using shotkey diode
Here is the atached schematic of the clamping diode condition. Isolated the connection to contoller and kept the end open. When USB input is varied above 5V the expected output is diode cathode ...
-2
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1answer
27 views
Diode voltage for small signal model what is the small signal component v_d [closed]
What is the small signal component v_d in this graph? Since they say \$V_D = v_D + v_d \$
0
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1answer
57 views
Understanding TVS diodes in this application
From this Reference Design you can see they use two TVS diodes at the gate of the first FET to clamp voltages greater than 500V. They do the same in this other Reference Design.
So basically my ...
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0answers
128 views
Electrostatic protection - input and output ESD protection added to op amp w/built-in ESD
I have an op amp circuit using the OPA2626 that has a built-in input/output ESD protection of +/-3000V human body model. The circuit is 3.3V single supply, non-inverting, with only an external ...
0
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2answers
144 views
How to protect an input from ESD?
I would like to protect the input of a sensor (reference : MAX30001) from ESD.
In the datasheet, they say that the absolute maximum rating of this input is -0.3 V < Vinput < 2 V.
Do I have ...
0
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1answer
29 views
Understanding this clamp network
The circuit below is from this Reference Design.
I want to understand the clamp network at the input. How is VGS of Q1 kept at a safe level?
2
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2answers
914 views
What is the purpose of clamping the gate and source of a mosfet
Is clamping the gate and source of a MOSFET really important? I have seen this in some articles and some datasheets of MOSFETs where they have built in clamping.
As far as i know they are used for ...
1
vote
1answer
39 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.
0
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1answer
99 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 ...
0
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1answer
120 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 ...
0
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2answers
98 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. ...
0
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1answer
94 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 ...
5
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1answer
1k 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 ...
0
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1answer
72 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 ...
1
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1answer
234 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 ...
0
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1answer
115 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
votes
1answer
95 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 ...
1
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1answer
532 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 ...
3
votes
1answer
3k 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 -...
0
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0answers
135 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
523 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 ...
0
votes
1answer
271 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?
...
1
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3answers
192 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 ...
0
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2answers
232 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 ...
0
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2answers
470 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
vote
4answers
869 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
118 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 ...
1
vote
3answers
385 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
176 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 ...
0
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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
229 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-...
