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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41 views

Creating a simple address and data bus with Arduino Uno as a master using 3-state buffers and decoders

First of all, sorry if my post is too general. If you know a better place for this post please let me know. Problem I have 5 motors to be controlled independently (but not simultaneously, i.e. one ...
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55 views

Bubba Oscillator - Last filter not buffered

Let's say that we have the following circuit of a Bubba Oscillator The purpose of the four low pass filters is to achieve a 45 degrees phase shift in the oscillation frequency. Meanwhile, the three op ...
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45 views

CD4069 toggle switch

How to connect the trigger out instead of the switch? Like a toggle switch. The first trigger out activates the relay and remains ON infinity, the second trigger out deactivates the relay and remains ...
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64 views

Sensing when a 12 V line with a low-side switch is closed (switch is on) using an ESP32

I want to use an ESP32 to read when multiple 12 V low-side switches are closed. For that my idea was to wanted to split the 12 V line, connect a digital buffer and a level shifter from 12 V down to 3....
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41 views

Can I substitute SN74LVC1G04 (single inverter) for SN74LS00 (quad inverter)? (re: simple GAMEPORT to MIDI cable?)

I'm trying to design a simple GAMEPORT to MIDI adapter/cable. However, the original design specifies the 74LS00 which I think is used as a buffer: http://midi.teragonaudio.com/hardware/pc_intfc.htm I'...
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56 views

Function of timer's output buffer

What's the function of the timer's output buffer?
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29 views

SPI Level shifter direction

I have different SPI peripherals operating at 3.3 and 5 V logic levels, with the MCU operating at 3.3 V. Therefore I use level shifters (in my case I used 74LV1T32GWH with the two inputs tied together)...
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52 views

No Input to Open Drain Buffer, yet Output Drives Low?

I'm kind of stuck with understanding why the output of an open drain buffer is going low when there is nothing connected to the input. We're using the SN74LVC1G07. Truth table states that if the input ...
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74 views

Expected behaviour of a non-inverting buffer IC

I am using an NL17SZ07 buffer w/ open drain. Is it to be expected that I need to pull the output high with a pull-up resistor to have the output behave as expected? I would have anticipated that the ...
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1answer
35 views

How to measure the I-V characteristic for IBIS-model?

As the IBIS spec says (pg.184) the voltage range for a GND clamp I-V characteristic must be GND-POWER...GND+POWER. For example, if the IC uses a 3.3V power, the lowest I-V characteristic voltage must ...
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45 views

The input buffer of a Sample and Hold

In a Sample and Hold circuit, I know that the buffer amplifier after the capacitor keeps the capacitor from discharging because of its high impedance and causes the output voltage to be equal to the ...
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Is ping pong buffer the same thing as a double buffering?

In ping pong buffer we have two buffers, when one is being written by upstream component, the other is being read by the downstream component. When writing into one buffer is completed, the downstream ...
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522 views

How does a unity gain buffer work?

Say we slow down time to a crawl, and turn on a power source connected to a unity gain buffer. Initially, the non-inverting input receives the signal and the inverting input receives nothing, so the ...
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How to use voltage follower after BJT amplifier in LT SPICE

Hello in a circuit I'm trying to create, a voltage follower is placed at the output of a BJT amplifier in order to create a buffer from the rest of the circuit. When I do this with the "ideal op-...
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23 views

SDR Output Monitor + Protection Circuit for Amplifier

I'm working on a PCB for a satellite ground station and I just had a question about the feasibility of a circuit I had come up with. The ground station uses an ettus x300 SDR and then the signal is ...
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Clock Buffer enabled after probing

I have clock buffer(NB3H83905C) on my development board. Pin 1 and 16 are interfaced to 25Mhcrystal(250 ABMM G3C) pin 3 and 1. After power on, I don't see the clock on pin 1. When I touch pin 16 using ...
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31 views

Buffer with parallel capacitors

Hello I am trying to build the following 3 band equalizer for a project. As I am analyzing the circuit I've come to a problem. I do understand what the "second stage" does: It's a summing ...
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259 views

Is a buffered signal less prone to interference?

For analog signals where the distance between source and ADC is significant (let's say for a practical example 1 meter of 28 awg wires), is it better to buffer the signal on the source side? Or does ...
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44 views

Current amplifier for Signal Generator output

My signal generator (SDG2122X) current output is not sufficient to power my load (requiring below 1A at <100 Hz). I need to amplify the current (as much as it needs without overloading the circuits)...
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165 views

Is this behaviour of op-amp buffers normal? [duplicate]

I am trying to buffer a voltage divider and I am not sure if I miss something or doing something wrong so I ask here for sanity check. I use a PC power supply and I have tested a -12V/12V channel and ...
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88 views

Can this buffer provide adequate current to drive an ultrasonic transducer?

I am using a BUF634P Buffer (Datasheet) to drive a wideband ultrasonic transducer. The impedance of the transducer varies with frequency and reaches a minimum X = 100 Ω, while its resistance (...
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62 views

How do I bias two OTAs without dividing the current?

I'm trying to achieve automatic gain control in an audio circuit, which requires me to use both diode pins of each amplifier available on the LM13700 chip. The diode pins accept a current (Idiode), ...
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52 views

What's the purpose of the applied "buffer networks" between each level?

The following simulation is performed to analyze the Nyquist diagram of a 3 pole RC low pass filter. I don't understand why the highlighted networks are required. How does it work? With buffer: ...
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125 views

Are voltage followers pointless if it needs an external power supply?

I see a voltage follower is used when you have a mismatch in the impedances of two circuits. The voltage follower allows you to push more current/required current to the low impedance load. However, ...
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60 views

Amplify the output current of an MCP4725 in order to drive multiple sensors

I want to connect the signal generated by a MCP4725 digital to analog converter to the heater of five sensors. The LA6500 works well to amplify the output current mcp4725 for one heater sensor. Can I ...
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298 views

TL071H unity gain buffer output voltage drops to zero when input near to zero

When the input voltage is smaller than 300 mV, the output voltage drops to almost zero. When it is above 300mV, the output follows the input. Why? If there is any discrepancy between input and output, ...
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158 views

How to calculate the Vout/Vin in this circuit? And how to write this circuit in a simulator like PSPICE? (buffer)

This question is about this circuit, a signal conditioning circuit. I am trying to the discover the Vout/Vin, I think it is one but I can't demonstrate it. I can't figure out why these resistors and ...
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98 views

Complex op-amp analysis for audio filter circuit help

This circuit is from the datasheet for a demo board for the CS4334 i2s audio DAC. I'd like some help analyzing the circuit. Not shown is the audio source, which is immediately before ALA and ARA. ...
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52 views

What happens when level translator input and output are shorted?

I am using a level translator in my design to interface between two systems. I also want an option to bypass the level translator by shorting a jumper resistor placed across terminals A and B. What ...
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4answers
1k views

Communication between two microcontrollers using SPI, I2C, and some sort of buffer?

I have two microcontrollers that are both pretty maxed out on their capabilities. MC1 needs to make a 14bit measurement result available for MC2. MC1 can communicate with SPI, and MC2 can communicate ...
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87 views

Understanding the Schmitt trigger circuit using CMOS inverters

This is the circuit I'm trying to understand: What I understand: Clearly, whenever \$V_{out}\$ is low \$M_{3}\$ is off and the strength of \$M_{2}\$ and \$M_{4}\$ surpasses that of \$M_{1}\$ so the ...
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405 views

For multiplexers, what are the pros and cons of Three-State Buffers vs "Straight Gates"?

This came up from my previous question when looking more closely at multiplexers. Wikipedia article shows two ways of implementing them. One with some Three-State Buffers, and the other that's just &...
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90 views

SPI slave: Store received byte? [closed]

SPI slave receives bit per bit (mosi) every clk and when a byte is completed (process A), this byte of data will be sent to the next process B (FlipFlop). If process B detects byte, process A starts a ...
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264 views

What is the purpose of the three part circuit?

I'm studying for my final on introduction to circuits and came across a question about this circuit: The question is: Identify and describe the three parts of the circuit used for a measurement ...
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101 views

MOSFET analog output buffer for 0 V to 2.4 V signal

I have a signal that starts at 0 V and linearly increases to 2.4 V as output and I would like to buffer it such that it cannot be influenced by resistive loads. The issue is that the only buffer ...
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1answer
126 views

Op-Amp buffer overshoot

The circuit I am designing includes a PWM signal that goes through a voltage divider, and that signal then gets buffered to be read by an AtoD as part of a measurement circuit. It looks like this: ...
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102 views

A simple circuit of NOT using a buffer

First of all, I am new to the area of electronics and I want some help to stuff that may sound to you a little obvious. I've seen a circuit using transistor that is used as a NOT logic gate, as in the ...
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165 views

How to design a good buffer circuit?

simulate this circuit – Schematic created using CircuitLab I am trying to design a buffer only using NMOS and resistor as this picture shows. The goal is to get the CLK signal as much amplitude ...
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How to buffer balanced (XLR) audio signal while forwarding phantom power [duplicate]

Background: I have a condenser microphone, which requires +48V phantom power from my mixing desk. The microphone has a source impedance of "<200 Ohm" as per manufacturer. As you may ...
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1answer
38 views

Low power buffer with open-drain output

Considering 74AUP1G07, I was wondering why this design, which I recently came across, supposed to be correct. since I'm not allowed to share the schematic, I will describe it: on separate part of the ...
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276 views

Op-Amp buffer Enable/Disable

I am designing an electric veichle controller for a University project. The motor driver receives an analog signal (0-12V) to adjust the speed. I use a digipot followed by a buffer to convert the ...
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1answer
61 views

Internally compensated opamp for 5V/V or more

I am using opamp for some signal conditioning circuit. I want to use opamp as voltage follower. It is mentioned in the Opamp datasheet that opamp is internallly compensated for 5/5V, 10V/V, or more ...
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326 views

Why does a buffer amplifier change the behaviour of a bandpass filter?

Why does the implementation of a buffer amplifier separating the high-pass and low-pass filter of a bandpass filter affect the transfer function of the bandpass filter? I thought the point of a buffer ...
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1answer
180 views

Daisy Chaining Shift Register Concerns and Fan-out Limits

I've been tasked with massivly expanding some GPIO of a microcontroller, and my inital thought was to chain a bunch of SN74HC595 and SN74HC597 shift registers, however to get the ammount that's ...
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112 views

SD card breakout board

I'd like to read data from a SD card using a microcontroller (through SPI protocol). Looking for a slot for the SD card, I saw two different boards. https://www.adafruit.com/product/254 This one has ...
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105 views

LVTTL Buffer IC output logic when input is high and not connected to supply voltage

To buffer a LVTTL signal to FPGA I am using this TI buffer SN74ALVCH16827DGGR.The buffer IC is placed on a FMC based IO card mated to a ZYNQ mother card. The problem I am facing here is when an input ...
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3answers
112 views

Unity gain buffer giving DC out

I am feeding square wave (0-5V) at 1kHz through a AD713JNZ op amp which I have wired up as a unity gain buffer, but I'm getting 5V DC on the output: What am I doing wrong?
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611 views

Significant error with unity-gain feedback op-amp

I used this OP97 op-amp to make a simple unity-gain feedback circuit. I would expect the output in this case to follow the input with very little error, however the output is actually measured at \$ 2....
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253 views

Operational amplifier output buffer

I made a simulation for a simple output buffer to use more current for an operational amplifier. The goal is to achieve a precise output voltage at moderate speed (This is considerd a DC application) ...
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340 views

Is it possible to make a high-impedance voltage follower using a fully-differential op amp?

With a single-ended op amp, I can create a unity-gain voltage buffer like this: simulate this circuit – Schematic created using CircuitLab The input impedance of this circuit is equal to the ...

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