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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24 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 ...
4
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1answer
142 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. ...
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2answers
141 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
48 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
53 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
71 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
107 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
68 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
122 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
39 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
38 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 ...
3
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2answers
119 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
180 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
97 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
votes
1answer
178 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
72 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
2k 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
75 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
votes
1answer
635 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
263 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
votes
1answer
332 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
498 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 ...
11
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2answers
614 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
202 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
votes
2answers
189 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
513 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
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1answer
162 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 ...
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5answers
2k 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
239 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
144 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 ...
1
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1answer
426 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
votes
2answers
529 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
86 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
285 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
807 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 ...
1
vote
1answer
363 views

Why does the use of Tristate-Buffer prevent exceeding the fan-out?

Why does the use of a Tristate-Buffer in digital-circuits prevent exceeding the fan-out of logic gates? The number of Logic Gates-inputs, that are connected to a single output is the same, as using no ...
5
votes
1answer
329 views

Long Chains of Shift Registers

I want to set up an LED display, and I'm looking at using a bunch of 16-bit LED driver chips (like TI TLC5927) to run a 16x16 LED matrix. Then I'd like to maybe put a few of these 16x16 displays ...
2
votes
2answers
320 views

What are the typical uses for a non-inverting quad buffer IC?

Do excuse my lack of knowledge on the subject, but on the Opendous JTAG schematic there are two 74LCX125 IC's. The datasheet refers to them as Low Voltage Quad Buffers, but I don't fully understand ...
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0answers
1k views

Arduino Uno Serial Buffer Overflow

I ran into some problems using the SoftwareSerial-Library of my Arduino Uno R3: Sending and receiving signals (...
0
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1answer
571 views

Pull-down resistor with ADM485

I have ADM485 already mounted and an output of some device, buffered by CD4050BM. For the circuit to be safe for the RS485 bus, the ADM transiver initially should either be in Z-state or read-state. ...
1
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1answer
232 views

Circuit for controlled buffer

I designed a circuit that requires buffers with the control gate (not like the ic's that have the control that will make every buffer turn on or off) . I am wondering how this works, and how it can ...
0
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1answer
86 views

Problem with octal buffers

I have a bunch of random IC's from electronic goldmine and one of them includes the MM74HCT541 octal 3 state buffer. So just a simple circuit to test it, I have 4x AA batteries and I am hooking this ...
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2answers
199 views

Application of buffer chip in serial communication

On a microcontroller board that I am working on, there is a buffer chip between the microcontroller TI msp430 F1611 and USB interface ...
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0answers
209 views

Which op amp for microphone voltage follower?

I have been modifying a 4-channel digital field recorder to use specialist condenser microphones. I have got all the phantom power issues sorted and am able to make recordings. Channels 3 and 4 were ...
6
votes
2answers
257 views

Chosing a pulldown resistor

Setup: A digital output from a device is connected to an output buffer to drive an optocoupler. If device power is lost the output will go in high-impedance mode. Problem: I want to make sure that ...
0
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2answers
108 views

74LVC1G125 on the arduino wireless shield?

What does the 74LVC1G125 do on the Arduino wireless sheild? Its just a buffer, but is it really necessary, or is it only necessary if you stack a lot of shields? (ie: collectively increasing input ...
2
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2answers
272 views

Is primary memory buffering the only way to access I/O devices and secondary storage?

I'm not sure if this is the right stack exchange site to ask this question so sorry if it's not. If anyone can cite a good book which explains computer architecture in general (not for a specific ...
3
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3answers
72 views

Does this buffer's current rating apply to each individual output, or all of them?

I'm thinking of using a SN74ABT244A octal buffer in a circuit that requires the buffer to sink 20mA of current on all eight outputs under worst-case input conditions. In the datasheet, it says that ...
4
votes
1answer
591 views

How to interface with a bus that's powered when the rest of my circuit is off

I'm working on interfacing to a SPI bus that is exhibiting some... bad behavior. The bus comes from a control box on a toy drumset. The control box is the SPI master, and it can be turned on and off ...
2
votes
1answer
445 views

How does an oscilloscope buffer work?

I am making a simple 1MHz oscilloscope with an embebbed system based on ARM and Android. I have an ADC with a speed of 12MSa/s that takes the samples. I need it to send the samples to a PIC ...