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Questions tagged [buffer]

A circuit or sub-circuit that as accurately as possible preserves the voltage characteristics of a signal while providing additional current. Typically used in situations where a circuit cannot drive the load that is presented to it.

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Buffering Arduino SPI bus using 74AHCT125

My SPI bus has 2 slaves, one is 5V tolerant and is connected normally to the bus, however the second one is only 3V3 tolerant and so I have to level shift it. I have decided to use the 74AHCT125 ...
zoghii's user avatar
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1 vote
2 answers
88 views

Driving 32 SiC MOSFET gate drivers with one function generator trigger signal

I have been having a hard time finding out how to drive 32 gate drivers for SiC MOSFETs from a single function generator signal of 5 V. My function generator is a Keysight 33500B. I'm using Genesic ...
Jay Eifler's user avatar
1 vote
1 answer
84 views

Feed output of oscillator to a 50 ohm load

I have a 30 MHz colpitts oscillator whose output I want to feed into a 50 ohm input impedance amplifier. When I try to simulate it the oscillator works fine by itself, however when I connect a 50 ohm ...
Francisco Maggi's user avatar
4 votes
5 answers
958 views

Unity Gain Amplifier Purpose

In layman terms, what is the main use and purpose of unity gain amplifiers? I am reading that it is used to "buffer high impedance sources" but I'm unsure what this means practically.
RL1's user avatar
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6 votes
3 answers
276 views

Problem implementing a voltage divider with a buffer amplifier

I'm currently working on a project where I need to implement a voltage divider followed by a buffer amplifier to scale down a voltage signal by a factor of ~10. However, I'm encountering some issues ...
LeCarthique's user avatar
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2 answers
91 views

Should I use an op-amp buffer so I'm not affecting the original source's current requirements?

I'm attempting to modify an existing product (a dance stage similar to Dance Dance Revolution) where the panel signal is held high (5V) and when it is pressed it pulls the signal low (0V.) Only High (...
SenPi's user avatar
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3 answers
130 views

What kind of BJT buffer should I use to connect a speaker to an STM32?

I'm trying to connect a speaker to an STM32. The purpose is to create sound using the DAC. The speaker I'm talking about is 0.5 W and 8 Ω. Tell me if I'm right: based on this the current will be 0.15 ...
Roh's user avatar
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1 answer
81 views

Will voltage at the inputs/outputs destroy an unpowered opamp?

I have a circuit powered by 12V that accepts an input signal of 0V to 10V. The circuit shall act as a buffer to the signal, with an added LED indicator. In certain circumstances, the circuit itself ...
one_three_three_seven's user avatar
0 votes
0 answers
59 views

3.3V to 5V driver (push-pull) output too low

I was recently testing using SN74LVC1G17DCKR and was having trouble getting the output voltage to reach close to Vcc as per the datasheet. Vcc input is 5 V. My input was 3.27 V and I was getting ...
Krishnadas R's user avatar
1 vote
3 answers
207 views

Sine wave CMOS buffer from inverters with or without feedback

Is it possible to buffer a sine wave using inverters alone or with some kind of feedback? I've been browsing google for minimalistic (I'm in 3.3-12 V domain) sine wave buffers and this thought stuck ...
San's user avatar
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3 votes
2 answers
194 views

Reading potentiometer with analog multiplexer and ADC: how to buffer

I'm building a MIDI controller with a bunch of endless potentiometers. They can be either 10k or 20k. I'm planning to read the values with an ADS7953. This is a 16-channel ADC. It has one converter ...
Szabolcs Szekelyi's user avatar
0 votes
1 answer
90 views

High voltage pad buffer design with 2nF load and ringing on first stage output

I am trying to design a high voltage (12V) buffer that will drive a sine wave with rail-to-rail peak-to-peak amplitude and a big capacitive load, maybe 3nF. Browsing I came upon this Master's project: ...
San's user avatar
  • 85
8 votes
5 answers
1k views

What is the difference between a tristate buffer and a transmission gate?

Functionally, these two "blocks" seem to do the same thing: send input to output if enabled and present high impedance Z on the output if not. However, this answer seems to suggest a ...
EE18's user avatar
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1 answer
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Are these switches really necessary?

I'm analyzing the OpenBCI Ganglion board and I reasoned that switches SW1 through SW4 (part number CJS1200) might in fact be useless. The negative input for each channel (X_IN-) is connected via a ...
AlexanderCar's user avatar
1 vote
0 answers
47 views

How to scale a GPIO control line to mitigate system impedance

I'm trying to build a circuit for a GPIO control line. Each device tapped into the line operates at 1.80v; the line is held at 1.65v HIGH. The GPIO output pulse profile is 1.000s @ HIGH 1.65v + 40ns @ ...
torpedo51's user avatar
  • 111
0 votes
2 answers
66 views

Is 74244 buffer suitable for multiplying data and enable in my Rasberry Pi3 to ATmega128A bidirectional communication?

My Raspberry sends data at baud rate 115200 to 300 remote panels (ATmega128A) through RS485 bus serial communication. Also it sends enable signal (5 V) and receive feedback from the 300 panels at the ...
Ezzat's user avatar
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3 votes
3 answers
505 views

Voltage Buffer Vs Impedance matching

I am designing an Amplifier circuit for the microphone. For this, I am using a buffer in between two stages for isolation and I am confused between 2 circuits. I know, in voltage buffer circuits, the ...
ishankhowal's user avatar
2 votes
1 answer
138 views

LM358 Output Voltage Issue / Compensation

I am working on a PCB to take a 0-5 VDC signal and convert into a 1-5 V signal with two channels and two op-amps. This is done with a voltage divider that takes the 5 V signal and converts to 0.995 V, ...
chemEE's user avatar
  • 21
0 votes
2 answers
76 views

Wheatstone bridge to voltage follower circuit not working as expected

I am designing the following circuit shown in the atached image. It is a wheatsone bridge with the differential output attached to voltage followers on each terminal and then connected to a single ...
ecp's user avatar
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0 votes
1 answer
320 views

NE5532 as a Guitar Pedal Buffer

I’ve been trying to better understand the NE5532 and wanted to try designing some circuits with it. I wanted to do a dual-supply non-inverting guitar pedal buffer, but I’m concerned about the input ...
Eli Y's user avatar
  • 91
1 vote
2 answers
220 views

Adding currents with transistors [closed]

I was wondering if it's possible to add currents with transistors (or other active devices) like we can add voltages with op-amps. Importantly, the currents need to be added in such a way that the two ...
KKZiomek's user avatar
  • 141
0 votes
1 answer
109 views

Practical Opamp Buffer Output Offset and Clipping Behavior

I'm designing a full-wave precision rectifier using OP07 in LTSpice. The first stage of the circuit (shown below) buffers the AC input using an OP07. But the buffer output is clipped with a ...
Kartik's user avatar
  • 117
0 votes
1 answer
105 views

Can I make a simple distribution amp with a CD4050 hex buffer IC?

I've got a 555 circuit hooked up to a Stylophone-type keyboard. I'd like to duplicate the audio tones—which I assume are square waves (coming out of pin 3)—a couple of times and run them through an ...
Explorer's user avatar
0 votes
0 answers
244 views

How to divide the PUL or DIR (stepper driver) signal into multiple equal signals

My problem concerns the synchronization of two stepper motors that control the movement of the Y axis. I built a 3-axis CNC machine that uses two stepper motors for the Y axis. The controller sends ...
Antonio Pisani's user avatar
0 votes
2 answers
241 views

How do you wire up the PCA9600 I2C bus extender to use differential signalling at 12V?

I would like to use a 12V differential signal between two NXP PCA9600 I2C buffers to extend I2C at 100kHz to about 15m over 100-ohm twisted pair (CAT6). My original understanding from a brief look at ...
KJ7LNW's user avatar
  • 2,022
5 votes
3 answers
796 views

LTC4311 vs PCA9515A: What is the difference?

We are hoping to run i2c sensors at about 10 meters and add some sensors over CAT6a cable. After doing some research, it looks like the LTC4311 can allow this, but it looks like the PCA9515A does ...
KJ7LNW's user avatar
  • 2,022
0 votes
1 answer
116 views

Pushing a button press from a driver to three different transistors with three state logic

I am working on a project within my company that involves a relay board used to control three different motors when an external 24 V button is pressed. The existing setup works based on this principle....
Knowledge's user avatar
  • 441
1 vote
3 answers
164 views

Opamp virtual ground when power is removed

Does the virtual ground condition hold true when I cut off the power supply of the opamp? I am using an opamp as a buffer. If I cut off the power supply but continue to give a signal on the non-...
Rachit Juthani's user avatar
6 votes
4 answers
3k views

Why is op-amp buffer used at input to ADC?

This is from datasheet of TI part ADS7041: The 200ohm resistor and capacitor form a low pass anti-aliasing filter. On the left of this, we have the input driver buffer op-amp. How do we know if we ...
quantum231's user avatar
0 votes
1 answer
109 views

Transfer function of buffer

Not really sure on how to proceed I got (Vin - Vout)/10K + (Vin - Vout)/wc = 0 I need to determine the poles and zeros for the same The motive is to understand the pole added by the capacitor at some ...
Harkirat's user avatar
  • 121
0 votes
1 answer
49 views

Looking for a Quad 3−State Noninverting Buffers in DIP package [closed]

My application is a half-duplex serial communication (2 buffers) and a switch for a 35 to 60mA load (1 buffer). I found On Semi MC74HC126AN (https://rocelec.widen.net/view/pdf/h52tembhav/ONSMS12940-1....
Paul Jurczak's user avatar
1 vote
2 answers
798 views

What is High/Low Level Output current in Buffer?

I have an hex inverting buffer (HEF40098B) and I don't understand anything about the High-level-output-current and Low-level-output-current in it's datasheet. What is the meaning of High-level-output-...
Mehran Najaf's user avatar
1 vote
0 answers
188 views

Is it okay to buffer a differential signal using two op-amps?

I want to use use an OPA1632 to amplify a differential signal and feed it into an ADC, but this draws current from the signal depending on the feedback resistors, which changes based on the gain ...
Zipdox's user avatar
  • 41
0 votes
1 answer
118 views

FPGA output to another FPGA input, 3 meters away

I have one FPGA (Artix-7 XC7A100T-2CSG324C) connected by a PCB trace to another FPGA (Artix-7 XC7A100T-2CSG324C.) The PCB trace is 3.4 meters long, 0.154mm wide, 0.185mm high from GND plane. The ...
trident_'s user avatar
0 votes
2 answers
440 views

Offset adjustment with unity-gain buffer

I want to include to my design an 'variable offset adjustment' circuit using an operational amplifier. This circuit would allow me to ajust the offset of my design. In my circuit, I already has a ...
Developing Electronics's user avatar
3 votes
0 answers
122 views

Is it possible for one oscillator to drive two ICs?

I have this oscillator IC with which I plan to drive a KSZ8795 and an LAN9500A without clock buffer. The TG2016 output load drive is 10pF for the capacitor. The KSZ8795 can have a crystal load ...
user avatar
2 votes
5 answers
2k views

"Pull-up" and "pull-down" or "push" and "pull"?

I thought about this question when I read an interesting comment by @Simon Fitch in his answer. In the complementary amplifier stage, in total there are three "pulling" elements - Q2 is a &...
Circuit fantasist's user avatar
14 votes
4 answers
3k views

What is the basic idea behind the so-called "diamond buffer"?

The idea for this question came about after I wrote an answer to a similar question. This "diamond solution" was something unknown to me. I took a look at Wikipedia page (see the picture ...
Circuit fantasist's user avatar
1 vote
3 answers
344 views

Help with power buffer using capacitors

Looking for some help on how I might be able to add a power buffer of around 1 hour to an IC using super-capacitors, and be able to recharge it within 5~15 minutes after a power disconnect. Looked ...
RCampos's user avatar
  • 13
2 votes
2 answers
136 views

Overlapping messages in Arduino Serial.print()

I have this Arduino Sketch: ...
Vandrey's user avatar
  • 123
1 vote
1 answer
91 views

Do dual supply voltage buffers with dual outputs exist?

I need a dual voltage supply (+-15V) voltage buffer for my design. This component will receive a signal (varying from -10 to 10V) and transmit it with gain=1 (line driver, voltage buffer or voltage ...
wertyu's user avatar
  • 33
1 vote
1 answer
182 views

Buffer for driving VMEbus

I am working on a project where I am reusing a VMEbus backplane to create a bus between some cards of my own design. This backplane has passive termination on both ends. I am trying to find a buffer ...
Tom S's user avatar
  • 183
0 votes
1 answer
132 views

How to use a tristate buffer when negative voltage can appear on its output?

This is a followup to Injecting a UART TX output signal to an audio input pin, without messing up the audio? The preferred solution for TX was a tristate buffer, which makes sense, until we recognize ...
rspaudio's user avatar
2 votes
2 answers
134 views

Is my microphone capsule dead?

I am using a JLI2555 microphone capsule. I tried making a circuit to see if the microphone capsule works. The goal was to measure voltage fluctuations at the output with a voltmeter as I yell into the ...
LEXOR AI's user avatar
  • 346
3 votes
1 answer
332 views

Issue in rail to rail opamp as buffer

I'm using LTC6090IS8E#PBF as buffer. Following is the circuit. Actually my input is 100 V and I'm attenuating it to 60 V using voltage divider. Then 60 V is given to non-inverting input of LTC6090IS8E#...
Brt's user avatar
  • 65
0 votes
2 answers
44 views

Would not this buffer reduce signal resolution for sensor driver? (recommended schematic)

I am following this design. For my application, the LVDT driver would give me a +-10 V output. Analog Devices recommeds a buffer for clearing the output signal of the driver. The thing is that they ...
Developing Electronics's user avatar
3 votes
1 answer
220 views

Clock Fanout Buffer Circuit

I need a clock fanout buffer to drive 3 components with same clock, and I have found this reference design but could not understand the reason of using the inverter in the middle. Can I directly ...
Cenk's user avatar
  • 75
0 votes
0 answers
148 views

translating LVDS to LVTTL using amplifier and high speed output buffer

I am receiving an LVDS clock differential signals and need to convert them to LVTTL . the problem is that the LVDS frequency is above 500Mhz and the LVTTL output needs to drive a 50ohm resistors, when ...
Danny Am's user avatar
0 votes
0 answers
91 views

Buffer works for signal from function generator, but not guitar signal

I am trying to create a buffer for a project I am working on. I found this schematic on line and built it. When I input a guitar signal the output equals V+ rather than giving the signal at the ...
Daniel Valentine's user avatar
0 votes
1 answer
196 views

Inverting buffer

I want to buffer a signal with a 7404 IC, but this is an inverting IC. With feedback from the input to the output the signal becomes non-inverting again. Is this method correct and can it be used in ...
Meysam's user avatar
  • 43

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