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Questions tagged [diode-clamp]

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Would this diode clamp work in real application?

I am reading the book The Art of Electronics and came across the diode clamping section. It has this circuit using a diode to clamp the voltage to specific power supply voltage (my example is 5.6 V.) ...
Dominykas's user avatar
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0 answers
27 views

Verify whether the Motor Driver has PWM Support

I was looking for a single channel motor driver with a supply voltage range of 6V - 12V and a continuous current range of 2A. I came across a motor driver IC called SS6285L. This motor satisfies the ...
Kailash Kumaravel's user avatar
1 vote
3 answers
142 views

Damaged ATMEGA328P despite clamping diodes and current limiting resistor

I have a custom PCB designed to interface an Arduino Nano's ADC pin that had 12v from a bench power supply inadvertently connected to a header pin meant for 5v input. The ATMEGA328P now gets extremely ...
Robert Susmilch's user avatar
0 votes
2 answers
68 views

Am I using the Zener Diode Correctly?

I am building a custom atmeta328 board that I want to make sure handles the bootloader properly. I have DTR from my FTDI chip going through a .1uF capacitor to the Reset pin on the MCU. I also have ...
Kevin McQuown's user avatar
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0 answers
53 views

Biased Clamper Circuits

I have been tasked to design a clamp circuit to clamp the negative extreme of a periodic input waveform to −5 V. I can use diodes, zener diodes, and resistors of any values required. I will assume a 0....
RK Eshat's user avatar
  • 153
4 votes
4 answers
865 views

Op-amp with Schottky diode

I'm struggling to understand what the sense is of using the two Schottky diodes in this excerpt of a circuit: I understand how a Schmitt trigger works. The diodes ensure that the voltage difference ...
olympus_mons's user avatar
0 votes
1 answer
117 views

How does clamping circuit work when ideal diode is used?

I'm currently having problem in understanding the dynamics of capacitor when it is in connection with an ideal diode. In the circuit below we can see a sinusoidal source of 40V peak to peak and a ...
MSKB's user avatar
  • 177
2 votes
2 answers
2k views

Please explain the use of these diode clamps on the op-amp input and output

I come from this post Guitar Pre-Amp stage/filtering and STM32F4. I found this circuit below in the answer by Dave Branton. Why does it include 2 clamps, one at the input and one at the output? ...
jjavi66's user avatar
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2 votes
1 answer
143 views

ESD protection when reverse stand-off voltage and required clamping voltage are close together

The circuit under consideration is to be powered by four 18650 li-ion cells in series. These cells are in a holder and user replaceable so there is risk of the contacts being touched and adding esd ...
Unimportant's user avatar
  • 4,683
1 vote
3 answers
322 views

Why design a clamper circuit with battery in series with a resistor?

I have been trying to design a circuit that clamps the positive peaks of an ac signal to +6 V. We can use batteries, resistors, and capacitors of any value desired in addition to Zener or conventional ...
RK Eshat's user avatar
  • 153
0 votes
1 answer
114 views

Phase shift in clamper circuit

I'm trying to simulate this clamper circuit in falstad: But there's a phase shift in the output voltage of my circuit. Is this expected? Am I doing something wrong? Can someone please explain? (I'm ...
Shub's user avatar
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1 answer
32 views

Does this sentence imply the FET will be turned on if it were not already?

"If the voltage potential from VBB to VOUT exceeds the clamping voltage, the power FET will allow current to flow from VBB to VOUT (path 3)." https://www.ti.com/lit/ds/symlink/tps1hb50-q1....
kellogs's user avatar
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1 vote
0 answers
77 views

Protection of the power supply input from high voltage pulses

I am assembling a power supply for xenon arc lamps. I use a simple welding inverter as a stable current source. I use the presented scheme. The ignition circuit generates pulses up to 25-30 kV for a ...
Typeof undefined's user avatar
1 vote
1 answer
72 views

Why clamping voltage is not given for some ESD diodes

I was comaparing two ESD diodes.Their P/N's are PESD5V0S1BL,315 and PESD5V0U1BL,315. If you check the datasheet of both parts you can see that clamping voltage is specified for PESD5V0S1BL,315 and ...
Confused's user avatar
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2 votes
2 answers
1k views

What is the role of the capacitor in clamper circuit?

I am having some difficulty in understanding the use of a capacitor in the clamper circuit (attached above.) I read that it maintains a constant potential across it, but then why do we not use a ...
green_32's user avatar
  • 143
0 votes
1 answer
144 views

A fully clamped sinusoidal wave has its RMS multiplied by the square root of 3. Is my textbook mistaken?

A fully clamped sinusoidal wave has its RMS multiplied by the square root of 3: Vo = 1.73Vi My textbook says that clamper circuits don't affect the Vpp and Vrms of an AC signal. Obviously, Vpp didn't ...
İbrahim İpek's user avatar
-1 votes
2 answers
112 views

TVS diodes clamping voltage against waveform and current

Having come across these two datasheets, two patterns might be inferred: Clamping voltage increases with current: https://www.tme.eu/Document/edf5842caa2ca49fd1e87fde0a7b9438/sts32xxxxuxxx.pdf ...
kellogs's user avatar
  • 1,061
0 votes
2 answers
182 views

Driving a solenoid via a digital output

What are the effects of the pull-down resistor (33K) when the solenoid-valve enters its turn-off phase? Will it prevent the solenoid-valve from ever discharging because current would flow from ground ...
user2063586's user avatar
2 votes
1 answer
279 views

Protect Arduino components from ESD damage from external input

I have an Arduino Due project that senses voltages through an ADC (ADS1115). The ADS1115 voltage sensor inputs will have intermittent connections. I have already fried my compass module by ESD and am ...
Rob's user avatar
  • 41
0 votes
1 answer
306 views

How does anti-parallel diode for limit current work?

I read OPA627 datasheet. This datasheet mentioned over voltage protected with 2 diode in figure 33a: I can understand how it do. Vi will be clamp when Vi > |Vs| . But the figure 33b: Datasheet ...
curlywei's user avatar
  • 661
0 votes
2 answers
624 views

Protecting a battery charger from reverse polarity

I am building a battery charger for AGM (lead-acid) batteries that will output max. 5 amps to charge the battery, through a pair of clips. This makes it a possibility that the battery could ...
Liftyee's user avatar
0 votes
0 answers
65 views

What is the purpose of the clamper circuits here?

I've looking at cell equalizing circuits, and just because it's expensive to drive them with isolated drivers I have come across this circuit which does the same thing with simple clamper circuits: I ...
Shamurov's user avatar
  • 183
0 votes
1 answer
176 views

Alternative to the transil diode in an AC converter

Can I omit the transil diode (1.5KE68A1) in this 220V to 110V converter, or is it essential? Is there is an alternative, such as a varistor or EPCOS switching spark gap? Circuit source.
maher471's user avatar
5 votes
3 answers
505 views

Diode-connected BJT vs base-emitter BJT diode vs diode

I was having a look at the circuit design of Keithley 236 SMU. You can find this part of the circuit in the Keithley 236 Service Manual. Q47 is a BJT. Only the base and emitter are connected, which ...
ONLYA's user avatar
  • 163
4 votes
2 answers
645 views

How can you block the parasitic body diode in digital CMOS I/O IC design?

I've been screwing around with IBIS models lately and came across something that left me scratching my head. First, the generic model structure for the semiconductor portions of an IBIS I/O looks ...
Ste Kulov's user avatar
  • 4,717
4 votes
2 answers
3k views

MCU working at 3.3V and RS485 driver at 5V - how does this circuit work?

I was looking for a "quick and dirty" solution in order to work with MAX487 (5V) and my ESP32 MCU. I know that Maxim integrated produces the MAX3485 and MAX3483 that are specifically ...
VirtApp's user avatar
  • 579
0 votes
1 answer
62 views

How is energy conserved in an LC tank with voltage offset?

Consider an ideal LC tank oscillator offset by an ideal battery*: The core question is this: is the energy balance here maintained by the charge-voltage relationship of the battery? Energy seems to ...
concat's user avatar
  • 131
2 votes
1 answer
136 views

How much current can opamps' integrated ESD diodes carry during an ESD strike?

So the basic answer to such kinds of questions is usually: "If nothing is specified in the datasheet, assume the most conservative rating!" However, the datasheets usually only mention the ...
tobalt's user avatar
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3 votes
3 answers
1k views

Limit voltage follower output using Zener diode

I created a voltage follower/buffer for a first stage transimpedance amplifier and want to limit its maximum output voltage to roughly 3.3 V to protect the following ADC from voltage spikes. ...
Miromed's user avatar
  • 41
7 votes
2 answers
1k views

FPGA over-voltage protection for input trigger signal

I don't have much experience with PCB design, but I am currently designing one to connect together several components for a work project. One of these components is connecting an external trigger ...
hexahedronest's user avatar
0 votes
2 answers
493 views

Using a diode to clamp a 24V logic output to 5V

I have a controller board (the Teknic ClearCore) in which output signals are pulled up to 24VDC. I am trying to interface with a TLC5947 LED driver IC rated at 5V maximum control input voltage. The ...
user11271728's user avatar
0 votes
1 answer
226 views

Negative peak clamping circuit

The picture shows a clamper that clamps the negative voltage peak of a signal to -5 volts. I have two questions: 1- What is the function of the 15 volts battery ? It says that diode does not turn on ...
Jack's user avatar
  • 684
0 votes
3 answers
1k views

How does the "zero current detection circuit" work?

This question refers to the L6562A PFC driver. My problem comes from the following highlighted text from the AN2761 application note. I can't understand the reason for 1.4V. What's the meaning of &...
WeTech's user avatar
  • 735
0 votes
1 answer
200 views

clamping the amplitude of a wave to certain level

I'm trying to prevent a wave form from exceeding 10V.p.p. I tried various things, but ... what the correct way to do it? this clamps a 11V signal to +/- 900 mV ... and converts a triangle to square. ...
NaturalDemon's user avatar
0 votes
0 answers
137 views

Voltage clamping for 28V nominal circuit

I am using a Vishay SIP32430 load switch for a 28VDC nominal input design. The absolute maximum rating for Vin is +30VDC. My input voltage will be nominal +28VDC, but short duration, low energy ...
Lunde's user avatar
  • 125
5 votes
1 answer
182 views

Can a ggNMOS be implemented discretely on a PCB?

Reading this answer, I ran across the ggNMOS for ESD protection. https://electronics.stackexchange.com/a/576935/166672 Reading on the web a little, it seems that this is only used inside of an IC, not ...
Aaron's user avatar
  • 8,061
0 votes
2 answers
890 views

Clamping to rails of an unpowered circuit?

Clamping diodes are a common way to limit an input to a safe voltage range: if the input goes below 0V or above 3.3V, one of the diodes begins to conduct and clamps the input to (roughly) the rails. ...
mairas's user avatar
  • 35
0 votes
0 answers
158 views

Transformer surge protection with MOSFETS

I'm trying to come up with a good solution to protect a 48VAC circuit against power spikes from the transformer when the load is suddenly disconnected. Since I have a bunch of MOSFETs and Zeners at ...
Miomio's user avatar
  • 123
-1 votes
1 answer
136 views

How to build an "instantaneous" clamper circuit [closed]

I am asked to clamp a signal 5sin(ωt) V with frequency of 1 kHz to a DC level of 2 V and -4 V. I already built circuits that can do that. But my professor says that the graphs should be exactly like ...
Daniel Melo Avila's user avatar
2 votes
1 answer
884 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 \$...
wave.jaco's user avatar
  • 665
6 votes
1 answer
999 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 ...
wave.jaco's user avatar
  • 665
0 votes
2 answers
45 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 ...
DarkKnight's user avatar
0 votes
1 answer
1k 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 ...
romeoPH's user avatar
  • 317
0 votes
2 answers
501 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 ...
romeoPH's user avatar
  • 317
0 votes
1 answer
120 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. ...
euraad's user avatar
  • 1,324
0 votes
1 answer
1k 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 ...
sgdsgyhetwaraw's user avatar
0 votes
2 answers
690 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 ...
euraad's user avatar
  • 1,324
0 votes
0 answers
358 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 ...
buncho888's user avatar
0 votes
0 answers
600 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 ...
Duxnax's user avatar
  • 1
0 votes
2 answers
212 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 ...
zsky3333's user avatar
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