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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3answers
79 views

Why does this circuit produce a static noise?

I was just designing this Common emitter transistor amplifier this morning. simulate this circuit – Schematic created using CircuitLab I have removed the input in the circuit ...
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2answers
36 views

make a buffer balanced

i am still new to electronic and i probably have a stupid question.. i am trying to build a buffer for a piezo microphone following the project on this site: ...
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0answers
60 views

How can I simplify this circuit? [closed]

Can this circuit be simplified? If so, How?
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2answers
124 views

Pull up on output pin of Buffer SN74HCT245

I am using SN74HCT245 Buffer operating on VCC=3.3V. So, I am getting 3.3V at each output pin of buffer (B1 to B8). But if I want to drive a load with 5V input, what options are available to me by ...
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0answers
39 views

74HC4051 Analog multiplexer settling time

I have simple schematic for multiplexing single ADC input to multiple analog inputs, made from LMV934 buffer and 74HC4051 analog multiplexer. The problem is, after selecting desired analog input, ...
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1answer
75 views

Diode circuit fed with voltage follower doesnt work

I have a ldr circuit. In order to drive other circuits i connected a LDR circuit to voltage follower. I want to see at the output either nearly 0V or 9-12V. At Ltspice it works, but at the blackboard ...
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2answers
79 views

buffering large DC signals

Is there a way to buffer a large DC signal accurately? I would like to measure a voltage that can go from 0 to 50VDC, with 16 bit accuracy (so down to the mV level at the highest voltage, and µV ...
4
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0answers
98 views

Buffer for 5V, 500ps to 10 ns pulses

I am trying to make a buffer for short, 5V pulses. The pulses are negative (form 5 to 0 V) and last for 500 ps to 10 ns (Half maximum, full width). The load is capacitive, around 50pF, and as close as ...
5
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2answers
138 views

can I use any OP AMP as buffer

I am still studing OP-AMPS and I was playing around with voltage follower/buffer configuration, the very basic diagram connecting the inverting input to the output directly and put some voltage on the ...
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2answers
64 views

Unity gain op amp gives static, incorrect output

I have the circuit shown here: where I'm using a switching regulator (not the linear 78xx shown) to provide me with 5V to power an Arduino and a little more circuitry that the Arduino is monitoring. ...
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1answer
22 views

multi channel buffer

What is necessary to drive two op amps (tl071 for instance) from one piezo guitar pickup, which of course is a very high impedance source? Result being, one very high impedance source creating two ...
0
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1answer
58 views

op amp emitter follower buffer offset

Hi, I'm using an emitter follower op-amp buffer with LM6132 and PN2222A. I'm expecting almost an exact follow?, as simulated with multisim. However, I'm getting an output offset of around 50mV at ...
2
votes
1answer
103 views

In a simulator, outputing +/-5V peak AC through bridge rectifier then opamp buffer gives 5V DC output… software error or does this really happen?

In a circuit simulator I'm using it shows that if I run an AC voltage through a bridge rectifier and output that to a op amp buffer, the voltage at the input of the opamp (and hence the output) is the ...
2
votes
2answers
104 views

Difference between tri-state buffer and inverting tri-state buffer

Is there any significant architectural difference between non-inverting and inverting tri-state buffers? In what cases would it be advantageous to use one over the other? To me they seem like the same ...
3
votes
2answers
86 views

Is there any bidirectional IC with on/off state?

I need a bidirectional IC with on/off state. In on state, IC should have very small impedance on the line. In off state, IC should provide very high impedance to isolate the bus. It's for an ...
5
votes
1answer
105 views

Simple way to invert a tristate output

I am looking for a simple circuit to invert a tristate output from a microcontroller, hopefully using only BJTs. What I mean by this is that the truth table would look like: ...
3
votes
1answer
203 views

how to split audio with buffers?

I am split an audio signal coming from an op amp to both a line driver buffer and a VU meter buffer, as shown in the schematic. My trouble is in determining the correct placement and value of ...
1
vote
1answer
77 views

How do I get a low impedance current output from this circuit?

I am learning about the VI characteristics of diodes, specifically nonlinear resistor applications. The circuit in this question is used as an example, but the question applies to any high to low ...
3
votes
3answers
159 views

Lower impedance for AC coupled darlington amplifier?

I have a problem I can't quite figure out. I essentially want to "buffer" a 50mVpp audio signal to drive a 16 ohm load. I preferably want to use primitive components so I thought that maybe a ...
0
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0answers
40 views

Guitar/Bass to 3.3v ADC Scaling Circuit

I designed this in the simulation, it works nice in the simulation. welcome your comments, thanks. guitar/bass output is an AC signal up to 500mV. opamp is MCP6004 working under 5v supply. the ...
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1answer
77 views

Voltage follower/Buffer circuit as summing amp

Is that possible to use a voltage follower/buffer circuit as summing amp? In history, what kind of circuit was used for summing amp before people started to use those inverting summing amp circuit? ...
0
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2answers
90 views

How much current can this 74HC245 handle on each output pin?

How much current can this 74HC245 handle on each output pin? Is it 20mA, 35mA, or 70mA? I don't understand what the difference between output current, output clamping current, and supply current is. ...
1
vote
1answer
109 views

Different ways of using UART

What is the difference when you send/receive data via Linux serial device file like ttyS3 and when you directly read/write from/to UART FIFO buffers? What situation is more safe and better? How ...
1
vote
2answers
98 views

Opamp AB Class Current Buffer

I am trying to design 100W (100V - 1A) Opamp Current Buffer with unity voltage gain. I will use PA441 or LT6090 opamp. Apex published a circuit for this amplifier. Please look at page 3 from the link ...
2
votes
1answer
83 views

Small stepper, simple driver

It's a very small stepper at 18 ohm resistance per coil(2 of them) (4 phase). I got: stepper in the picture, L9110, LM358, arduino. I used an L9110 with the arduino. The stepper moved where it was ...
1
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0answers
141 views

spi fan out - sn74AHC244 - not working

I'm a complete beginner at this so please don't overlook any silly mistakes that a complete beginner may have made. I have a home-brewing project, where I am attempting to hook up multiple MAX31865 ...
0
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1answer
103 views

Trouble splitting off LFO signal to drive LED

Background: I am trying to build a very simple noise box that doesn't need to be tuned to 1V/Oct or anything special. It simply has one VCO, two LFOs, and a VCA. The circuit is powered off of a dual ...
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2answers
81 views

Unexplained voltage drop in input clamping & buffering circuit

I'm designing a circuit consisting mainly of 74LS series logic. I am clamping and buffering several input signals using a zener diode and a 74HC7014 Schmitt trigger buffer. A relevant excerpt of the ...
2
votes
2answers
105 views

How improve temperature sensitivity of HP 721A DC Power Supply voltage reference?

I have a sentimental affection for my HP 721A DC Power Supply: http://hpmemoryproject.org/pict/wall_a/anim/721a_q90/viewer.htm Rugged, dependable, and roughly as old as I am, it is also pretty ...
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vote
2answers
343 views

Help for a 5V to 15V level shifter

I'm using FPGA DE2 board cyclone II from altera (for PWM generation) to control a DC chopper via ARCAL 2108 driver ;The problem is that the FPGA GPIO output gives a 3.3V but the driver is +15V input . ...
2
votes
2answers
391 views

How do I implement a tri-state buffer for a vector in VHDL?

I want to implement a tri-state buffer for a input vector, triggered by an enable vector, where every bit of the enable vector enables the corresponding bit of the input vector. Something like this ...
1
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1answer
367 views

A simple FIFO buffer in verilog

I have decided to implement a FIFO buffer in verilog (for fun). Here is my primary prototype you can say : It will consist of a register bank or memory. Each register will be of size N and there ...
0
votes
1answer
89 views

Buffer to have ( 5V-->15V) with DAC conversion

I'm working on a project of a digital control of a DC/DC converter (DC/DC converter which I need to control with an FPGA). My DC/DC(IGBT) is wired to an ARCAL 2610 driver. My question is: My ...
0
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1answer
112 views

Verilog mux using a clock

I'm trying to get a simple piece of logic working: on the positive edge of the clock the output should always be 1, on the negative edge, the output should be the value of a provided input. I've ...
0
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1answer
122 views

Need a voltage follower buffer for a tube, how do I calculate and select a mosfet?

I'm finishing up a design here: https://123d.circuits.io/circuits/852190-jan-6418-vaccum-tube-valve-preamp which is a preamp for an instrument. First, let me know if anything stupid pops out at you ...
0
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0answers
71 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 ...
0
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4answers
176 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 ...
0
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1answer
85 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 ...
0
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2answers
94 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 ...
3
votes
3answers
306 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 ...
2
votes
1answer
676 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 ...
0
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2answers
59 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 ...
0
votes
2answers
239 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 ...
0
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1answer
208 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 ...
0
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2answers
133 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 ...
2
votes
2answers
537 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 ...
0
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1answer
130 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 ...
0
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1answer
83 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. ...
0
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1answer
214 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 ...
1
vote
1answer
151 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 ...