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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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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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27 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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76 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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45 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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1answer
41 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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25 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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1answer
52 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
79 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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1answer
57 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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1answer
47 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
31 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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1answer
104 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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68 views

Atari Punk Console with sequencer to multiple inputs

I designed an APC circuit with two APCs on it and a step sequencer, which basically cycles through a series of potmeters with a 5V voltage to it. When I route the sequencer to one discharge pin on ...
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1answer
135 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
329 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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2answers
100 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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1answer
42 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
118 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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45 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 ...
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5answers
174 views

Does the Sallen-key filter require a buffer for low power applications?

I am designing a circuit which takes an 3uV at 10-10kHz input that filters, applies gain and integrates the analogue signal. I'm thinking of using the circuit below for the topology using two stages ...
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30 views

MCP4922 buffer feature

I'm using the MCP4922 as a dac with some different python programs. I am using this python package which has a setVoltage_buffered(channel, value) command. To quote ...
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2answers
255 views

FPGA double buffer strategy

I am working on a FPGA project where a host CPU writes a 10,240 x 16-bit look up table into FPGA logic. To implement this, I've utilized on-chip memory to store the values and read them out when ready....
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65 views

Different logic levels on single input

I have a circuit that has about a 1V input that gets boosted to 3.3V. To enable the boost converter IC, a switch is pressed which causes the enable signal [EN] of the converter to go high (and stay ...
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1answer
85 views

Issues with coupling a buffer to an optocoupler

The buffer below between the input and the opto works fine itself, but Im having problem when Im interfacing it with 4n32 on the right. (Frequency of the hardware-trigger will be around 40Hz pulse ...
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1answer
597 views

How to implement 8x1 multiplexer using 3x8 decoder and 3-state buffer

Suppose that AB and CD are 2-bit unsigned binary numbers (a) Find the truth table for the function F with 4 inputs A, B, C, D to satisfy the following condition if AB >= CD, then F = 1, otherwise F =...
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49 views

Estimating actual capacitance for aluminum electrolytic capacitor in buffer application

Application: In a capacitor power buffer application it is preferable to have higher voltage over the capacitors to increase the energy density, as the energy E in a capacitor is given by $$E = \frac{...
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3answers
5k views

What is the purpose of an AND gate with the same signal on both inputs?

If this is a buffer, why use an AND gate, aside from better availability of that gate in a single package? This is on an Analog Devices SHARC eval board.
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3answers
89 views

Sampling one signal with two separate ADCs at different rates?

I have a system where I need to pieces of information from a single analog signal. The first is a time-average of the signal, over the course of around 0.25 seconds. The second is a detailed breakdown ...
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2answers
228 views

Efficient size of FIFO buffer for UART

I am designing a software for a microcontroller that transmits and receive data from various UARTs in a loop every 15ms. I am using UART interrupts to send and receive data. UART interrupt copy bytes ...
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2answers
153 views

Using a capacitor to buffer power to eMMC

Sorry in advance for what may be an elementary question. I'm designing a circuit to provide a few hundred milliseconds of backup power to an eMMC module in case of power loss. This is to provide the ...
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1answer
164 views

Why CCVS feedback amplifiers are popular as RF buffers

I've been attempting to build a VCO recently (around 50Mhz) and I've reached the part where I need a solid buffer for my oscillator. Looking around at various options I can't help noticing that many ...
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1answer
96 views

Switching analog and digital inputs to uP

I have a microcontroller, which requires that no signals are connected to its input ports during startup. There is a control signal SYS_RESET, that should first rise, before any input is connected to ...
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1answer
36 views

Current to voltage converter and voltage follower

I am designing a current to voltage converter for my sensing device. followed by a voltage follower or a buffer. by varying vcc, so that i can achieve sensitivity of my circuit. do i need to have same ...
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1answer
271 views

A simple buffer for a piezoelectric pickup to mixer connection

so my question is pretty straightforward: what are the ways in which this circuit is likely to fail, and how can I protect against that? I play music (mandolin and viola) and my instruments have ...
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1answer
50 views

i2s sginals and noise when connecting a 10cm cable

I have a board that outputs an i2s signal (mclk at 49Mhz) using normal fliflops at output. Works perfectly when connected with short connections. If I try connecting a cable at 10cm or more, I have ...
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0answers
283 views

Interfacing LVDS to 1.2V IO Bank (e.g. POD12 or SSTL12)

I am currently working with an Arria 10 device (specifically a ReflexCES A10 SoM Indus module). The GPIO pins of the device are split into IO banks with specific VCCIO voltages controlling the banks. ...
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1answer
154 views

Purpose of cascade buffers

I'm analyzing the circuit in the picture below. I've read a little about unity gain amplifiers/buffers and think I understand the use of a single buffer. But I don't understand the purpose of having ...
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2answers
106 views

Op-amp voltage buffer attentuates the input

I'm using the LPV821 op-amp (http://www.ti.com/lit/ds/symlink/lpv821.pdf) for a buffer circuit (voltage follower). Below is my circuit, where the desired output has the same voltage as the input (V2): ...
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22 views

Number of elements vs bit per elements - Logic buffer design considerations

I'm currently looking through the logic buffer page on Digikey. Two of the parameters you can sort by are: Number of elements Bits per elements After looking through the data sheets, it appears that ...
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1answer
133 views

Voltage buffer output not similar to input

I am having trouble interfacing with MIC6211 op-amp. I have it configured as voltage follower (buffer): VIN changes from 5 V to 20 V. The op-amp output is high impedance (100% sure, even disconnected ...
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3answers
148 views

Is there a need for buffering in this case?

.. will be updated soon (in construction with a more accurate information) If the ADC (or the data.acq device) have 100 kohm input impedance, how much accuracy would I lose? Do I need to buffer this ...
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2answers
125 views

Why I had to add buffer to this circuit?

So before adding an op-amp buffer between sensor and the non-inverting input of a schmitt trigger, if the output of the sensor was for example 0.4V, the moment I connected it to the non-inverting ...
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1answer
168 views

How many tri-state buffers can be connected in parallel?

According the 74HC244's datasheet, the maximum three–State Leakage Current IOZ, ( with Output in High–Impedance State, Vin = VIL or VIH, Vout = VCC or GND) is about 5 microamps. I want to connect N (...
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2answers
289 views

DC voltage follower

I'm working on a biomedical project, and need to transfer DC voltage from a source to a load. The problem is that the source has a high impedance relative to the load so I'm trying to have a DC ...
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1answer
78 views

Filtering noisy buffer output

Please bear with me as this is my first time working with filters. I am trying to scale down the voltage from my piezo to a voltage which my ADC can read (from >100V on the piezo to 0-5V on the ADC ...
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2answers
224 views

How do capacitors affect Operational Amplifiers?

When we have an OpAmp as the one below: This was extracted from an exercise in which V2 was an AC power source. However, I have tried to imagine what would happen if it was DC. It is obviously a non-...
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3answers
420 views

“Perfect” transistor using an op-amp

The U1:A(+IP) represents my input (0 to 6V). I am trying to power a lamp which requires at most 6V@100mA, the input will vary between 0 and 6V but it doesn't provide enough power for the lamp (the ...
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3answers
231 views

How can i design a current follower that can copy current without affecting the circuit current?

I want to design a circuit which will copy a current from another circuit without affecting that circuit current. An input circuit there is some current through a resistor or path I want to follow ...
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1answer
53 views

Whats the usage of logic buffer( NC7SP126) in this design, how to troubleshooting it?

I am troubleshooting my devices which are subjected to battery drain issue. I have never worked with this buffer chip before. Can Anyone can tell me what is the purpose of adding this chip to the ...