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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64 views

Buffer amplifier used in medical implant hearing aids

I am new here, so if I am posting in the wrong area, please let me know. Recently at the university I've had a guest lecturer, that works at Cochlear developing medical implant for the hearing ...
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2answers
86 views

Buffer management for SD card in SPI mode

I'm looking into implementing storage of large audio files onto an SD card. I'll be using SPI to access the card to avoid any patents by the SD card mafia. I'll be generating a lot of data, about ...
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0answers
36 views

OV7670 frames are 640x308 not 640x480

There is a lot of helpful information on the internet about getting the OV7670 camera up and running but the following problem has me a bit stumped. I am using a Maple r5 Board (STM32F103RBT6) to ...
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1answer
58 views

Floating a digital output pin of an IC

I'm using a FXLS8471Q accelerometer for a project using the SPI interface. The chip uses the same pins for SPI and I2C. To detect which interface the user desires, the chip samples the SA0 pin on ...
2
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1answer
33 views

LTSpice Level 2 Simulation CMOS follower

I'm trying to make a level 2 simulation of a voltage buffer made by a CMOS circuit: For this, I have been told to use level 2 CNM25 technology Spice models for the transistors, and I have been ...
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3answers
264 views

Turn TTL output of logic IC into output capable of driving 50 ohm devices

I want to provide front-panel trigger signals with the microcontroller inside my device. The trigger signal will be fed via a 50 ohm coax cable to another device with a 50 ohm input. A direct ...
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2answers
231 views

What are buffer and latches in microprocessor?

I would like a description that clarifies the concepts of what buffers and latches are and the difference between them. I'm asking for buffers and latches in respect to the 8086 microprocessor.
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1answer
87 views

Is it safe to use a bus buffer as level shifter?

I am currently using SN74ABT5402ADW as a buffer and level shifter for my ADC, however, the datasheet does not explicitly say that it can be used as a level shifter. I provide it with 5V power, but the ...
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1answer
478 views

Understanding this statement in ATmega328P's datasheet

While reading ATmega328P's datasheet, I came across the following statement. The Port X output buffers have symmetrical drive characteristics with both high sink and source capability. What does ...
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1answer
128 views

Differential ADC input buffer

I am trying to make 10Mohm of input impedance into a ADC (CS5530). I am planing to use differential input buffer to ADC so I am trying to use TI's document as reference. I tried the one differential ...
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2answers
159 views

Battery Voltage Sensing Circuit (Voltage divider, buffer)

I've been trying to figure out a quick and easy circuit for sensing a battery's voltage, then translating that voltage to an 0-5v signal that could be read by a microcontroller like an Arduino. My ...
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3answers
103 views

Problem with ADC of Atmega16A in differential mode

I am having some problem while using ADC interface of Atmega16A. I want to calculate RMS voltage of the power supply coming to my house(usually 250V, 50Hz) and display it on LCD. I am using the ...
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2answers
82 views

Arduino + LS7407N to shift logic levels in serial communication

I'm trying to drive a device that uses 12-0V levels for serial communication. I decided to use LS7407N, a buffer with open-collector, so that I can use Arduino's TTL levels to send commands to the ...
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5answers
121 views

Resistive loading effect voltage drop

I have been working on a project that is supplied by 8.4v battery. I then used the 7805 voltage regulator to get 5v and supply the electronics. Later, I figured out that I need to have 3.3v along ...
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1answer
70 views

Operation amplifier concept problem

I'm new to op amps and I'm trying to grasp the concepts. Starting with a simple op amp buffer, with the output connected to the inverted input. One rule states that the op amp tries to keep the inputs ...
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0answers
117 views

Can't read the SPI buffer of a PIC32MX

I have some problems with my SPI communication. Indeed, I have configurated the PIC32 as master, and it communicates with a slave which is a memory. The communication works perfectly. LEGEND : In ...
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1answer
176 views

Why would this logic gate use negative voltages?

I'm reading a data sheet for a hex buffer with enable- a pretty simple logic DIP. Here's the logic diagram and pin assignment: This all makes sense to me until I look at the electrical parameters. ...
3
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2answers
242 views

Why we gradually increase size of inverters in buffer design?

When trying to drive a high capacitive load why do we gradually increase size of inverters in buffer design. Why not give the output of a circuit to one large inverter?
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0answers
73 views

Looking for tri-state buffer driver/receiver

I'm trying to build a circuit with multiple client MCUs and one server MCU. They are all connected through a common bus. The bus contains 5 lines (Power, Ground, TX, RX and Control Signal). The ...
3
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1answer
63 views

Help to understand output levels of clock buffer

I'm dealing with clock buffer and trying to determine how output levels depends on the input. I'm using information from the datasheet. Here is the table with information: I don't understand the ...
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2answers
93 views

Signal distribution, buffers, rise times and EMC

I am designing a DSP based audio mixer. There are 4 AD/DA converters (AD1939 and AD1974) and a DSP (OMAP L138), which is on a carrier module. I am distributing the frame clock (48kHz) and the bit ...
4
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1answer
127 views

Distributing a 40MHz clock to several PCBs

I need to run four PCBs with a very accurately synchronised clock. The source clock is 40MHz, but each PCB contains a 1GHz PLL, and will be timing events in the analogue domain with a final ...
1
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1answer
80 views

Capacitor with op-amp

if we connect a capacitor with charge = 5 volts , with buffer (op-amp) , will the capacitor will discharge it's voltage ? or because of high impedance will keep it's charge ? simulate this ...
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2answers
163 views

Extremely noisy signal after voltage follower/buffer [closed]

I am trying to create a voltage follower for my CCD linear array. When I measure the signal with oscilloscope directly from the CCD outptut - the signal is reasonably clean. However, when I measure if ...
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1answer
72 views

protecting a sensor component from high spikes when switching power on

I have an electrical scooter which has a "Hall Effect Sensor" in the handle-bar, measuring the magnetic flux to determine the amount of "gas" or gauge. This sensor tends to burn out quite frequently. ...
0
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1answer
51 views

In a tristate buffer which transition time should be larger

I was having a doubt related to tristate buffers. I know that a tristate buffer allows an output port to assume a high impedance state in addition to the 0 and 1 logic levels, effectively removing the ...
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2answers
152 views

Buffering AC supply voltage and detect power loss?

I'm designing a system integrating: an industrial PC with 230V AC input (~300W) various peripherals requiring 24V DC (150W max) In case of external AC power loss, the DC components (2) need to be ...
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1answer
680 views

Difference between a n bit Latch and a buffer

What is the difference between a 8 bit buffer and a 8 bit latch? Are they both used for the same purpose? The 74LS273, is a buffer or a latch?
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1answer
149 views

Is Propagation Delay affected by signal frequency?

I'm using some line drivers(lvds) on a project and I have two signals that are propagating consistently differently. Signal A is about ~71Mhz and arrives consistently slower than Signal B which is on ...
3
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1answer
244 views

Handling multiple interrupts dsPIC

I have been thinking about my design for a while but couldn't figure out a better way to deal with buffer overrun in multiple interrupts. A dsPIC33EP chip is connected to a TFT display, a UART ...
4
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1answer
85 views

What is a Redundancy Buffer Power Supply?

I was browsing DIN Rail power supplies by output voltage and noticed Redundancy Buffer Power Supplies for very cheap relative to normal supplies. It looks like a normal supply is still needed and ...
4
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2answers
3k views

How to find Setup time and hold time for D flip flop?

I am simulating D flip flop in cadence, how to find set up and hold time in d FF? And I have design negative D FF using Pass gate and Inverter when i change same circuit to positive D FF by changing ...
3
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1answer
83 views

Extra Current because of Unity Gain Buffer Amplifier?

i was reading on the unity buffer amplifier. I did understand, that it can help provide extra current that source might not be able to provide. But where does this current come from? Is it from the ...
5
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1answer
1k views

How can I buffer SPI?

I have a board with a device that outputs data over SPI (as slave device) and a microcontroller. The device signals that data is available (24 bits) by setting a certain pin low, around 8000 times ...
4
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1answer
455 views

Is the Holzer effect the same as the Hall effect? (looking for replacement sensor)

I was looking for a replacement component for what I thought would be a "Hall effect sensor" (used in an electric scooter throttle handlebar). I had bought a replacement throttle about a month ago, ...
2
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1answer
429 views

Voltages go crazy when using 74LVC8T245

I am using a 74LVC8T245 buffer from Texas Instruments to interface 3.3V to 5V signals with my 3.3V microcontroller, here is my circuit: The IC is powered by a 3.3v LDO Regulator MCP1702T. Now, when ...
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3answers
763 views

Making a bi-directional tri-state buffer using two normal tri-state buffers, is it possible?

I need to use a tri-state buffer on a I2C bus and I have lots of 74125 (uni-directional tri-state buffers), so I'm wondering if is possible to connect two buffers back-to-back to make a bi-directional ...
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2answers
805 views

Using an op amp as a buffer

Working on a project where we're using a couple of OP470 Quad Op amps. There are 2 unused op amps, and I need to buffer a signal coming from a sensor (this is according to the sensor's data-sheet). ...
6
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2answers
237 views

Do the logic gate inputs of 74HCXX integrated circuits exhibit a high impedance?

Do the inputs of the 74HC374-SMD D-type flip flop have high impedance inputs? In datasheet is stated that it has buffered inputs, I assume that means high impedance, right? In other words, do I have ...
3
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2answers
275 views

What is the reason for adding a buffer stage?

I was following this microphone and speaker circuit and I could follow mostly but got confused when the author introduces a DAC buffer. http://www.instructables.com/id/Arduino-Audio-Output/?ALLSTEPS ...
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2answers
727 views

IC buffer like 4066 with 8 or 16 switches

I have a computer and two monitors. I want to build a device so that I can switch between to monitors. I would use buffers (like 4066) and a microcontroller. Is there any buffer like 4066 with 16 or 8 ...
4
votes
1answer
170 views

How Are Pixels Sent To The Screen?

So, today I started to wounder how pixels are stored, then push though the graphical bus. I have not really done much with LCD or touch screens. I do know from my programming background they are ...
7
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5answers
3k views

Stability problem in unity-gain opAmp

As a part of a controlled power supply for hardware-in-loop testing for a student driven project, I had to develop a current buffer (voltage follower) which could source up to 1 A. I had the (bad) ...
2
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1answer
387 views

How do I buffer a high Frequency clock on a Spartan 6?

I am trying to create a high speed clock on my Spartan 6 Atlys Board. The onboard clonck is 100MHz. I am trying to use an on chip PLL to get a faster clock. I am using a the clocking wizard IP to ...
5
votes
1answer
165 views

Strange behavior from variable-gain amplifier

Sorry, this might not go anywhere. My first SE question, though, on any site. I've built at least three distinct audio amplifiers with the TDA7056B, which is a really great amp. It takes a voltage ...
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1answer
487 views

Design 8X1 MUX with enable using three state buffers and any logic blocks you need

I have no idea where to start. I know how to create a MUX but how can I create it using three state buffers ?
3
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2answers
724 views

Darlington Emitter-follower used as a buffer

I have a circuit with a Darlington emitter follower used as a buffer between a common emitter amplifier and a low resistance load (speaker). i wanted to know if this arrangement could alone (with the ...
1
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1answer
93 views

Non-inverting version of EL7232? (High-frequencey 3-state DIP driver/buffer)

I'm driving a large number of parallel UART inputs from a single UART output, at 2 Mbit. Currently, I'm driving with a Atmega32u4 using a 70 Ohm current limiting resistor (which in theory would allow ...
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2answers
317 views

Oscillation won't pass voltage buffer

This is the full schematic of the circuit Full size: http://img443.imageshack.us/img443/9292/fulltheremin.png It didn't work on the first try. A theremin is an electric instrument which emit a ...
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2answers
1k views

Can I use an RC4558 as a voltage follower (buffer) for line level audio?

I've spent hours reading on buffers, non-inverting amplifiers and inverting amplifiers. I get the concept (though I don't understand all the formulas) and I can't make a simple voltage-follower out of ...