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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Driving an LC shutter using a solar panel

I am trying to drive an LC shutter using a solar panel. The particular LC shutter I am looking at is this one: https://www.adafruit.com/product/3330 Different voltage levels can be applied to this LC ...
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74HC125/74AC125 vs. 74AHC125N/74AHC125 for overvoltage tolerant USBtinyISP 2.0

The schematic of the USBtinyISP 2.0 makes a point of using a non-inverting buffer IC with overvoltage tolerant inputs: Only 74AHC125N is 5V compliant at lower VCC! I bought a couple of USBtinyISP 2....
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How to choose the RC values between a buffer and an ADC input?

In the OPA365 specification sheet there is this example circuit where they add a RC filter between a unity buffer and input of an ADC. My understanding of the purpose of this \$ 100 \,\Omega - 1\...
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Why does this JFET buffer perform so poorly at 82 MHz?

I made a Colpitts oscillator that worked well first time. Frequency about 82 MHz. (nb. corrected diagram adding ground between series 68 pFcaps and corrected Vout) I wanted to add a buffer and chose ...
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Audio splitter without buffer possible?

The audio source is an active mixer with an output impedance of 100 ohm, 25 mA output current and 3 V-pp max. The inputs that would receive this source are (1) an ADC with an input impedance of 20 ...
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Pin Buffer Types

I'm going through the datasheet of this PHY Transceiver LAN8742A On table 2.2, it is mentioned as buffer types. I see a row called as O12, which stands for Output 12mA sink or Output 12mA source. My ...
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Level translator as digital buffer

In the datasheet of the C12880MA (Mini-spectrometer) they recommend using a digital buffer on pins to and from the module (CLK, ST, EOS, TRG): I'm not sure why. In my case, I need level translation ...
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Buffer stages for driving capacitive load

How to calculate the number of (CMOS inverter) buffer stages to drive capacitive load? In my case, I am driving a 1nF capacitive load with CMOS (inverter) buffer with the digital signal having an ...
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Digital buffer/driver (74LVC1G07) not outputting signal. MIDI output circuit

I am expericing difficulties with a simple MIDI output circuit. I have checked the input of the buffer and signal is there. However, there is not signal at ouput. . At first I thought that I blew up ...
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Reading joystick potentiometers with an Arduino

I'm trying to make my Arduino read the 10K potentiometers on a joystick using analogRead(), but the values returned fluctuate too much when the joystick isn't being touched. I'm not using shielded ...
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When does a USART 'buffer ready' bit turn on?

I have an Atmel328P mini Xplained. The datasheet specifies UCSR0A (1 << UDRE0) as a 'buffer ready' signal. This reads 1 if the receive or transmit buffer is ...
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Why does this buffer amplifier show overflow?

I'm taking my first electronics course in my EE program, so I'm just delving into the world of Spice programs. l I've been asked to use LTspice to design a unity gain buffer amplifier using the ...
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Voltage follower configuration

for the LM4952 chip (class AB amplifier), I wanted to add an NE5532 OA in voltage follower configuration at its input. That to take care of whatever input source will be plugged into it. Is it a good ...
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2 votes
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Filter position for delta-sigma ADC

I am designing a ADC module for torque-based motor control application. The input source is Wheatstone bridge load cell with excitation voltage of 3 V. The loop time of controller would be around 300 ...
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3 answers
373 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. ...
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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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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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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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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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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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Function of timer's output buffer

What's the function of the timer's output buffer?
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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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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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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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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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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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6 answers
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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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1 answer
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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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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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4 votes
2 answers
277 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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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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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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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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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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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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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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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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4 votes
2 answers
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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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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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3 votes
2 answers
114 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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1 vote
2 answers
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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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1 vote
4 answers
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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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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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3 votes
2 answers
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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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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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3 votes
1 answer
330 views

How can I buffer a high voltage?

I'm trying to build a high voltage capacitor leakage tester with current limiting feature, below circuit is the simplified and raw idea: simulate this circuit – Schematic created using ...
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2 votes
3 answers
270 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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