Questions tagged [diode-clamp]
The diode-clamp tag has no usage guidance.
60
questions
3
votes
1answer
77 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
44 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
votes
1answer
93 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
63 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
vote
3answers
86 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
votes
2answers
60 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
votes
2answers
133 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
184 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
votes
1answer
46 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
votes
1answer
130 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
vote
0answers
146 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
votes
1answer
669 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
votes
2answers
125 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-...
1
vote
2answers
96 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 ...
3
votes
4answers
362 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
votes
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 ...
0
votes
1answer
500 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 ...
1
vote
0answers
119 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
vote
1answer
140 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 ...
0
votes
2answers
145 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 ...
1
vote
2answers
456 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:
...
0
votes
3answers
739 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
votes
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
votes
1answer
456 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
votes
1answer
889 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
votes
2answers
781 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
vote
1answer
306 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
vote
1answer
102 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
votes
1answer
933 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
vote
3answers
902 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
vote
2answers
439 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
votes
3answers
523 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
vote
3answers
121 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
votes
1answer
609 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 ...
0
votes
2answers
244 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 ...
1
vote
0answers
116 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 ...
-1
votes
1answer
259 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
vote
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 ...
5
votes
1answer
605 views
Over voltage and reverse voltage protection of multiplexed ADC with voltage follower
I am designing a protection circuit for the ADC section of a design I am working on.
There will be 8 analog signals being read by a single pin of the MCU via an 8 channel multiplexer. The analog ...
1
vote
2answers
489 views
How can I protect a sensitive Component from voltage spikes?
I have some Deep UV LEDs that are about 100$ a piece. They are Very sensitive to voltage spikes, a nano-second spike could destroy one. I am building a USB powered Device with a battery, and I'm ...
0
votes
1answer
975 views
Flyback converter losses
i have been designing flyback converter of a 5Volt 5 ampere specifications output deriving from 220v ac mains. But i have been stuck at one point and can't seem to get out it. Efficiency is ...
0
votes
1answer
383 views
How does the capacitor push up the voltage in a diode clamp?
I am having a hard time understanding how a capacitor is able to charge to a higher voltage level than the peak of the input source, like in a clamp circuit. I've been reading articles on clamp ...
2
votes
3answers
233 views
Protection of the system power supply?
Modern days, almost any CMOS chip has input clamp diode to clamp their input to the power supply, such as below:
So, in worst input over voltage situation, all energy will finally go to the power ...
2
votes
2answers
754 views
How does this clamper circuit work?
simulate this circuit – Schematic created using CircuitLab
I am doing a clamper circuit as shown in the above figure, I am confused regarding its operation when diode is forward biased we have ...
3
votes
2answers
1k views
How to bias a diode clamp with a voltage divider?
As you know a diode clamp is a circuit to protect sensitive circuits from excessive voltage. One approach to change clamping level is to use voltage dividers. most resources and textbooks represent a ...
1
vote
2answers
4k views
What happens when a TVS diode “burns”?
I am trying to use TVS diode to protect Integrated Circuits from surge voltage introduced from exposed connectors.
TVS will be attached in following way.
I wonder what happens if too much of voltage ...
0
votes
2answers
2k views
OP-Amp Diode Clamping Circuit
I'm working on updating our products, but there are a number of constraints. TL;DR I can't change the parts that would make this really easy.
We have devices that interface to our control panel using ...
3
votes
2answers
2k 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
...
2
votes
1answer
458 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 ...
4
votes
2answers
306 views
How does this PIC board achieve RS-232 communication without a line driver?
All the develooment boards I have seen yet with serial communication support usually have MAX232 line trasceiver. However, I have come across this Olimex PIC-LCD development board that does not have ...
