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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74 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
73 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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42 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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30 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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59 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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45 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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55 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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64 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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78 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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108 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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43 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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103 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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96 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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48 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
105 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
66 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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69 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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79 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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67 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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81 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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39 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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196 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
50 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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42 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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48 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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762 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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37 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
148 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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71 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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79 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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32 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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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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1answer
184 views

Enhancing the bass response of an audio isolation transformer

Below is a simple buffer circuit using an isolation transformer : The green trace is the output of the transformer and the blue trace is the input signal (20hz to 20Khz sine wave). As you can see the ...
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2answers
281 views

Noise and flickering first LED (APA 102)

I'm designing a circuit board to distribute power and data to 8 APA102 strips using a Teensy 3.2. While the first version of my board mostly works, I'm having some issues I'd like to solve for a ...
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44 views

2-wire analog buffers

How do these 2-wire analog buffers work? The one on the left is driving a current sink and the negative supply is hooked up to the output. The one on the right is a current source driver and the ...
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56 views

Buffer requirements for S/H circuits

I am trying to solve question 11.10 which is taken from 2001 GATE IN paper. So I think the answer is (a) because the input buffer which faces the analog input needs a higher slew rate in order to ...
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83 views

Buffer with TL084CN and resistors

simulate this circuit – Schematic created using CircuitLab There are two buffers made with the TL084CN, which is part of the conditioning of an LTS25-P transformer. Currently, I have put a ...
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3answers
272 views

Converting 3.3V signal to 5V with tri-state

I need to buffer and tri-state a 3.3V 8 bit signal, and shift the output to 5V (when the buffer is not in tri-state). I am using a CD54HC373 buffer and 2 BOB-12009 logic level converters, but I can't ...
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69 views

Purpose of Buffers in this Circuit

The schematic below is an H-bridge , the high and low mosfets are internal to the two ICs on the right side, their datasheet is here. What is the purpose of the part on the left, which I googled to be ...
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54 views

How to interface SN74 buffer with microcontroller into another data bus

I am hoping to interface a 3.3V ARM M4 microcontroller into an already established 5V data bus, and have it respond to interrupts to either read data from the bus or write data to the bus. The data ...
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1answer
50 views

Is a buffer required for this gas flow sensor to ADC connection?

I'm designing part of an application that will consist of an Omron D6F-P0010A1 MEMS flow sensor. The analog output of the sensor will be connected to a TI ADS1114 ADC. I'm trying to figure out from ...
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212 views

Buffer OPAMP feedback resistor

I am using an LT1630 as a buffer... I know its not the greatest OPAMP for the job because it has fairly Hi input current, but It has good DC characteristic, HI current drive, and rail to rail ...
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269 views

Buffer gate purpose?

If you use a buffer gate as separate power source where does that extra current come from??? They are drawn as single input and single output. Is there always assumed that there is another power ...
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1answer
1k views

FIFO Buffer (Circular/ring buffer) for packet storage

I am developing a simple radio transmission network using B-L072Z-LRWAN1 boards. The network structure is formed by: One board acting as a gateway (where data is received). Multiple boards acting as ...
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125 views

What does this RC network do in this audio transformer output stage?

This is a relatively well known ABY circuit available on the internet. CLICK HERE, REMOVED IMAGE FOR COPYRIGHT REASONS I have two questions about this circuit : 1) What does the RC network (in the ...
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61 views

Buffering the input to a passive RC integrator used to measure magnetic flux density

Note: this is part of a larger question which I was asked to separate into subquestions. Other subquestions: 1 and 2 I'm using the method outlined here to measure the induced magnetic flux density in ...
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1answer
442 views

How to design a high impedance buffer circuit?

How can I design a buffer circuit that takes an input of +/- 10V and scales it down to a 0V to 5V. The idea is to design a circuit that is microcontroller compatible (can be read by an analog-in pin ...
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78 views

How can I reduce loading effect in dc common drain source follower?

I want to make a dc voltage buffer using an nmos source follower. I found that by making Rs as large as possible or even open, Vs= Vgs-Vth. I verified it using multisim. The problem is it suffers from ...