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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33 views

FPGA : Tri-state inout buffer

I have a DE1 Altera Board and I program the FPGA with Quartus software. My goal is to set Vnode (see the scheme) HIGH (3.3 V) when I push a button (KEY[2]) contrariwise when I release the button I ...
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11 views

XBee Packet Buffer

I have an Xbee Pro Series 2. One is set as the coordinator and one as an end device. If I manually send a packet containing a one byte payload from the coordinator to the end device, I get an ...
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4answers
65 views

Making a LM1458 work as a Unity Gain buffer with an input of 0 to 12v output to a digital voltmeter

Making a LM1458 work as a Unity Gain buffer with an input of 0 to 12v output to a digital voltmeter. When I connect this cct to the injector timer (voltage) & a Voltmeter to the output the ...
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1answer
42 views

Use OP27 as an 'unit-gain buffer'

In OP27's datasheet, p. 14, it shows a graph when use OP27 as an 'unity-gain buffer', and give it a step input (I think it's a positive step). But it doesn't explain more about the waveform on the ...
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2answers
61 views

Reset IC Buffer manually

I have a buffer which I want to reset. The EN pin is connected to a pull upp resistor while the Reset pin is connected to pull down resistor. What should I do to reset the buffer manually? Should i ...
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0answers
58 views

Use LM324AN as unity gain amplifier

I am trying to read the voltage coming out of a voltage divider with resistors that could go into the mega ohms on the ADC of my micro-controller. The impedance of the divider is too great for the ...
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3answers
74 views

Need for Buffering Signals ?

What is the need for Buffering signals ? Is it to provide the ability for the source or circuit to be able to provide high current amount ? The buffer I was reading was the Op Amp unity gain ...
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1answer
247 views

OP AMPs : ADC Buffer on voltage divider plus protection

I have been reading lots of threads in the past but I have some questions which are still not clear to me. Please help me out in this! Picture of circuit is attached. So basically I am using ...
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2answers
37 views

Octal buffer/line driver need current limiters?

I have a couple of these http://www.toshiba.com/taec/components2/Datasheet_Sync//149/215.pdf I am using for level shifting 3.3 volts to 5v from a beaglebone to a stepper motor driver. The frequencies ...
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2answers
58 views

What would be the simpliest buffer amplifier design in this situation?

Take a look at this schematic: It is important to assume that we have the following constrains: 1) Load is connected to ground, therefore it requires a positive potential to activate 2) The ...
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1answer
69 views

Current sourcing octal buffer/line-driver for 7+1 segment LED multiplexing?

I would like to multiplex 8, 7-segment LED displays with two, 8-bit shift-registers. The required current for one segment is 20mA. I have no desire to overdrive the ...
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2answers
96 views

Understanding to isolating sensor input capacitance

The circuit given above is pH sensor buffer circuit, picture taken from here. This circuit have pH sensor input and gives an output that can be read by multimeter which is U2's OUT_ pin . U1 is here ...
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2answers
101 views

Why is a Buffer+RC-combination recommended for driving a SAR ADC analog input?

In various places, e.g. this tutorial video by ti, a circuit like the following is being recommended to drive the analog input of a SAR A/D converter: simulate this circuit – Schematic ...
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1answer
73 views

Having the same source for power supply and positive input for a single-supply buffer amplifier

I am new on designing power management for circuits. simulate this circuit – Schematic created using CircuitLab I want to design a circuit to stabilize the 12v power input. I have a ...
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1answer
41 views

Interfacing 6116 RAM to a data bus

I have a question about interfacing IDT6116SA15TPG SRAM to a tri-state data bus controlled by 74LS244 tri-state buffer. I could not find an old memory like 74LS289 with separated inputs and outputs. ...
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1answer
91 views

Triode preamp with TL072 phase inverter buffer?

Wondering if anyone can advise on this tube triode (12ax7) preamp stage followed by an Op Amp buffer stage to correct the inverted signal. I wired it up and did not work. Before tho, I wired it with ...
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1answer
76 views

How to implement a double buffer using an ARM Cortex M3

I am a total beginner, but I have been working on a project to attempt to build my own microcontroller that outputs basic 2D graphics to an LCD screen. In doing some research as to how this is ...
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2answers
106 views

FRDM-kl25z Serial Buffer Issue

I'm sending data over Serial to a FRDM-kl25z via a printf statement on another uC; ...
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1answer
35 views

clock drivers low current consumption

I am trying to drive a 30 pF load cap (1 pF times 30 or 2pF times 15 or so on) from a ring oscillator generated clock. The frequency I want is 250 Mhz. What is the best approach to keep the input ...
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3answers
61 views

Bi-directional logic level conversion

I'm trying to design an accelerated CPU (65816) for the Apple IIGS by using a high speed ARM processor combined with a software emulator + software emulated cache. The CPU I'm using is the LPC4300 ...
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2answers
391 views

Inverting buffer with op-amps

I know that it's easy to make a unity gain buffer with an op-amp (as a voltage follower): simulate this circuit – Schematic created using CircuitLab I also know that it's easy to make an ...
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2answers
124 views

Buffering/matching large signal to drive 5 ohm capacitive load at 13MHz (RF)

I built a Pierce oscillator that generates 13.5MHz @ 7Vpp signal from a V_cc=12V. But I need to drive a capacitive load of 5 ohms @ 6Vpp. I'm not sure how to do this. First I need a buffer to prevent ...
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1answer
223 views

VHDL How to Design a Screen (Frame) Buffer

I am trying to use a screen buffer to store, change and output the bits of a video data to the DVI transmit interface. I am using Altera Cyclone III development kit. I will be using 1440x900@60Hz ...
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2answers
93 views

Interfacing tri-state logic across 3v3/5v. Do buffers mirror all three logic states?

(This is just learning/hobby stuff...) I have a 5v (tri-state TTL, ZX Spectrum) bus and I want to interface some non-5v tolerant 3v3 chips to it. I think I need buffers or transceivers for the level ...
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1answer
82 views

74HCT245 buffer IC

In 74HCT245 bidirectional buffer IC, 3rd state is high impedance state as shown below. Link for datasheet: http://www.nxp.com/documents/data_sheet/74HC_HCT245.pdf If we want 3rd state as "Latch" ( ...
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0answers
25 views

Basic gate using transmission gate [duplicate]

How can we design the basic gates and universal gates using the transmission gate.
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1answer
132 views

Buffer circuit explanation

I just saw this question and was wondering how this circuit actually works, since I couldn't really figure it out, I though about asking it. This is the circuit I am talking about: Lets label ...
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1answer
46 views

Buffer amplifier

I have a buffer amplifier that is single supply 0-10v Lets say I give it an input (sine wave 0-10v Vpk-pk) and added a dc level-shifter to shift the input signal up by 0.5v (0.5v-10.5v sine wave ...
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1answer
100 views

Buffer Capacitors [duplicate]

What does a buffer do? In the given circuit,it is said that capacitors C1 and C4 act as buffer .What is their role here?Can't we just replace them with pull-down resisrors?
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1answer
149 views

Microcontroller circuit

I am using a Stellaris EK-LM4F120XL for a project. The project includes an LCD module, servo motor, ultrasonic ranger and a numpad. The LCD, servo and ranger are rated at 5V operating voltage, and the ...
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0answers
76 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
148 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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1answer
294 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
136 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
194 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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4answers
1k 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
4k 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
127 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 ...
3
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1answer
637 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
294 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
1k 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
264 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
111 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
206 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
197 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
266 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
votes
1answer
327 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
490 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
112 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
78 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 ...