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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23 views

Bidirectional protection or isolation for generic digital communications

I am redesigning a company product, it is a product for automotive maintenance and diagnostics. Currently in the product there is a FET BUS switch to perform the interface between the microcontroller ...
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29 views

Understanding Skid Buffer Mechanism

I have some questions about http://fpgacpu.ca/fpga/Pipeline_Skid_Buffer.html 1) Why is skid buffer designed to be 2-entries FIFO instead of just 1-entry FIFO ? However, pipelining handshaking is ...
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135 views

Do chained I2C address translators also act as buffers?

I'm working on a data collection/testing setup for multiple pogo pin test PCBs (~10 max per master) connected over I2C, daisy chained together. The design is based around the AD5593R ADC/DAC/GPIO chip,...
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79 views

Limit the current draw from Op-Amp

Following up on this question I redesigned my circuit with the suggestions from the comments (see comments from @Andy_aka). I want to drive the output of the opamp between 0-24V with an Vin = 0-10V. I ...
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100 views

Why is the output signal greater than the input signal in this voltage follower circuit?

I have implemented this circuit on my breadboard. The voltage waveform at point A and B in the circuit attached below should be equal because it's a voltage follower, but in my case, after ...
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896 views

Buffers output load in unpowered state

Lets take under consideration a 3 state buffer, such as this one: Since the datasheet doesnt provide the information about the internal build of the buffer, I was wondering either it is safe to ...
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2answers
76 views

I want maximum 5V output from an Op-Amp. Is it a good idea to use a supply voltage for the Op-Amp of more than 5V?

I have the following circuit. An Op-Amp (currently TLC2272CP) as a buffer (voltage follower). The non-inverted input of the op-amp comes from a DAC (MCP4922). I measure with an ADC (MCP3202) the input ...
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95 views

NXP PCA9615 I2C differential buffer - failure on SCL line

I am using the PCA9615 part to extend an I2C bus. The PCA9615 converts I2C to a differential bus. PCA9615 https://www.nxp.com/docs/en/data-sheet/PCA9615.pdf There is a control box and a remote ...
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53 views

Combining 2 NOT / BUFFER gate outputs for same input to increase current output

To drive a RLC circuit by pulsing at a frequency close to 1MHz, I would like to use a schmitt trigger inverter gate (SN74AC14) / buffer (SN74LVC2G17) in between the uC pin and RLC circuit for higher ...
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2answers
310 views

Reading interrupt safe ring buffer

I have a piece of code here that was generated by Atmel START Wizard. It setups a UART and it also creates a ring buffer for reading data. This is the code that reads data from the buffer: ...
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87 views

Op-amp inductive output impedance oscillation

In Learning the Art of Electronics pg.362, the author presents an op-amp follower driving a long cable. I don't understand the explanation given for the cause of oscillation. In particular, the author ...
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46 views

How must be the pull up resistor circuit connected to the driver input?

I have this circuit for getting 12V or 0V from external control signals. Signals will arrive by pin connector to my board. Switches will also be out of this board. External control signal could be ...
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1answer
27 views

Symetric Voltage source from OpAmp-Potenciometer circuit

I need to design a +/- 4.5 symetric source using only a opamp buffer, a 9V battery and a potentiometer. How can i do it?
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28 views

Reason for using this resistor network at I/p and O/P

I am designing a board using CDCLVC1108. I referred to the EVM and found a resistor divider kind of Network at output and input. What might be the need for these?
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39 views

Simulating matching op-amp input impedance with offsets

I have a current source with RC filter at the input of an LM324 op-amp configured as a buffer. The Input Biasing Current is 45nA and the Offset Current is 5nA for the LM324.The input resistor is 750k ...
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50 views

Why does this buffer apply a DC voltage through a high pass filter to the output?

simulate this circuit – Schematic created using CircuitLab What is the purpose of C3 and R5 in series between +9v and the Output? The only thing I could think of is that it supplies additional ...
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1answer
78 views

150V voltage follower

I am working on a datalogger to measure the voltage of a series of solar modules. I have 4 solar modules in series, let say 35V each. I am using an ADS1115 for the measurements. First I wanted to do ...
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1answer
81 views

Question about the common mode

After introducing the two-stages op-amp and frequency compensation for this circuit, during lecture the Professor asked us to find as an exercise a possible polarization of the following circuit: in ...
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59 views

Buffer-cum-Level shifter using dual MOSFET

I am putting together a Buffer-cum-Level shifter using dual MOSFET to deal with PWM signal for display backlight control. This 3.3V PWM signal is driven by MSP430G2452 and would be reaching the ...
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36 views

3.3V very low power consumption buffer for sensor output

I'm designing a portable Ozone meter with an Arduino that read the data from the sensor and send it via LoRaWAN. I've found out this sensor that seems perfect for what I need. My device runs at 3.3V ...
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1answer
75 views

Current Source Biasing with Diode Load

I am trying to replicate a circuit I found in the Art of Electronics (3rd Ed, page 229) but I am having issues. My load is a LED (Vf=~2.5V) and using a BC237 as the PNP (measured Vbe=~.675V). Using R=...
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2answers
65 views

Consequences of leaving unused inputs of clock buffer floating. Alternative: best practice

I'm using a Si53342-B-GM Original datasheet download at silabs for the si5334x-series as a clock buffer. In some cases I only need to distribute a single clock signal and in some of my cases I ...
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1answer
145 views

Buffer stage for audio filter

Can someone explain the purpose of this buffer stage? I understand how it works in the sense that I understand the cause of each reading on the oscilloscope but I don't understand why the buffer stage ...
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2answers
210 views

Increasing output current of DAC

I have an application where my Arduino is controlling a mcp4725 DAC for a design replacing a sensor on an old car. The DAC provides the analog output voltage, .25V to 4.9V to the computer. I recently ...
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373 views

How to connect a W25Q64 3.3 SPI Flash to a 5V Arduino Mega?

I need memory to read from, for my project. I first intended to use an SD card, but I now found out a W25Q64/128 SPI Flash is more practical, since I don't need to write data. However, this W25QXX ...
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156 views

What's the difference between 74LS00 “gates” and 74LS37 “buffers”?

The TI 74LS00 is "quadruple 2-input positive-NAND gates" and the 74LS37 is "quadruple 2-input positive-NAND buffers." The pinouts are identical. The LCCC package is documented exactly the same for ...
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59 views

Choosing clock buffering circuit

The modular 5V-powered design's module is having two output clocks (21 MHz and 3.5 MHz) to other modules in the system. I am looking for the best way for buffering these signals so that they would be ...
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261 views

1.8v to 3.3v level shifter logic family [closed]

I have been looking for a level shifter capable of doing 1.8v to 3.3v. For whatever reason it seems almost everyone carries 2v to 3.3v shifter but 1.8v to 3.3v are few and far between. For practical ...
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107 views

Help With Buffer Amplifier/Filter Type Circuit

I’m having trouble with a circuit I designed and I would be greatly appreciative if I can get some help here. The circuit I designed is a buffer amplifier type design intended to take two channels of ...
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62 views

High impedance state on SPI lines

I use an Orange Pi platform for flashing SPI chips soldered directly to the board. Chips are packed in an SO-8 package so I have to use 5250 pomona clip. There are no problems with flashing platform ...
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1answer
164 views

Noisy op amp buffer

I made an op amp buffer using a TL071 for my guitar but it is very noisy. The circuit is a simple follower. Originally I had no feedback resistor but I added it later in case it decreased the noise ...
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1answer
106 views

Intel FPGA equivalents of Xilinx IBUFDS Primitives?

Im trying to migrate an Design from using Xilinx primitives to Intel Altera FPGA. The original design uses the IBUFDS for the clock signals. ...
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71 views

Interfacing a microcontroller digital IO

I'm working with some microcontrollers, and I'm quite confused about how to interface the digital I/O. I've already see some projects with opto-couplers on outputs, other ones with buffers, so I'm ...
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154 views

Limitations of sound card oscilloscope

I’m supposed to build a buffer circuit for pc oscilloscope using the sound card of the pc and a software “zelscope”; however there’re limitations: Not possible to display DC because there’s a DC ...
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Why are BJTs common in output stages of power amplifiers?

From my understanding, the role of the output stage is to decrease the output impedance to almost 0. For that, MOSFETs seem better suited since they've got way lower \$R_{ds}\$. Yet I see quite often ...
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71 views

Does a Microcontroller act as a Capacitive load or resistive?

I'm designing a unity gain buffer (IC MCP6002) and in the datasheet, it says that a small series resistor is required at the output, if the load is capacitive and is >100pF. The input of the buffer ...
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139 views

How the oscilloscope input voltage rating is independent from attenuator setting

Since I'm taking part in a quite interesting educational project that incorporates the design and testing of the analog front-end of a relatively high speed ADC (up to 200 MSps) I've been studying the ...
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1k views

When do you need buffers/drivers on buses in a microprocessor design?

I was browsing Microprocessor Interfacing Techniques and found this pharagraph: The microprocessor's buses must connect to every memory and peripheral input-output chip in a system. All MOS ...
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1answer
40 views

Does a FIFO data buffer need to have the data be registered?

I'm trying to implement a 64 bit FIFO Data Buffer in Verilog. My design allows for data to be written at 4 bytes or 1 byte at a time, and I'm simply using two multiplexers with control signals for ...
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3answers
243 views

What is the purpose of a resistor in parallel with a buffer gate?

I am trying to build and understand the following circuit, it is an interface to load programs to a Commodore-64 using a mobile or mp3 player: Can you please tell me what is the role of R5? Any ...
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1answer
54 views

How to properly terminate this circuit

I have a 50 ohm BNC cable which connects to a coaxial connector on a PCB. I want to invert the signal from the cable with an op amp. If I use the top circuit from the image, will the cable be ...
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45 views

Choosing Common Logic Level HF Buffer

I need help in choosing a common logic level buffer for a 555 timer output that will vary in frequency. I'd like to use n-channel/p-channel MOSFETs though I'm also open to cheap IC buffers. ...
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1answer
49 views

Need to know the binary lower bit change impact in circuit

for example if i need 99 decimal number need on output, and ima giving binary digit of 01100011 in Nexperia part and iam replacing that part with Texas part, what is the effect on the circuit can u ...
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2answers
765 views

Odd 74HCT1G125 behaviour

I am using a 74HCT1G125 buffer as an '5 V output driver', but, in some cases it has a 12 V, low impedance source presented at its output pin (but in these cases its enable is false, i.e the ...
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1answer
38 views

Sharing a HD44870 display between multiple controllers

I have an existing third party system that has a HD44870 compatible display used for output. This third party system cannot be changed (for a variety of reasons), and I need to retrofit a device to ...
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5answers
202 views

Why do you use a buffer when the whole point of op amp is to amplify signal?

This might sound like a dumb question but I just learned about buffers and learned that they have same Vin and Vout from the amplifier providing nearly identical Voltage source value to the next op ...
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2answers
83 views

What does the condition “f=100Hz” mean for the Gain Bandwidth Product?

In the LT6003 datasheet you can find the following information: How do I read the Gain Bandwidth Product? I mean there is a typical bandwidth of 2kHz under the condition of f=100Hz and I'm not sure ...
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110 views

Buffered Voltage Divider VS Differential(Subtractor) Opamp

I'm trying to understand which one of these circuits is the best choice for measuring 400VDC signal using a microcontroller . But at first look circuit number 1 makes more sense since it is giving the ...
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35 views

Design sequential circuit with 3 state buffer

I asked to design a sequential circuit with 3 state buffer so when : Load = 1 -> put data into output Load = 0 -> don't change output Here is my design: But question said also use other gates. Is ...
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2answers
2k views

This op-amp buffer is oscillating and I can't figure out why

Currently, this is the only assembled part on the circuit board. This is a simple inverting buffer circuit that should be at the input. The op-amp (LTC6241HV) is powered +/-5V from a linear bench ...

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