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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0answers
53 views
Looking for SOT23-5 Buffer with unusual pin arrangement
I'm looking for a SOT23-5 non-inverting buffer with an unusual pin arrangement. From what I can see, the standard arrangement is as follows:
where A is the input and Y is the buffered output. Many IC ...
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1answer
62 views
connect a circuit output to a transformer
Helo
I have a sine wave oscillator, i want its output to drive a transformer.
When i connect a voltage source to the transformer i get the amplification desired
but when i connect it to the ...
1
vote
1answer
77 views
Do any microcontrollers allow steering of inputs to outputs?
Are there any MCUs which allow input signals to be connected (by software) to outputs?
The main requirement is that should not involve sampling (either by MCU code or SCTimers) as this limits the ...
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1answer
20 views
3-state buffer machanism
I read about the 3-state buffer. I do not precisely understand the working mechanism. It allows essentially to obtain a third state, that corresponding to the disconnection of the output from the ...
-2
votes
2answers
51 views
Is there a connection between circular buffer, FIFO and shift register?
I know that circular buffer and FIFO are similar but do not understand the difference that causes different terms to be used. How do these two compare with a shift register?
How do I know if I need ...
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votes
3answers
140 views
What type of Opamp for a simple buffer?
So I am using an Arduino Uno in my project to communicate (SPI slave) with a very tiny pedometer chip. The chip pins want max 20mA at 1.8V however Arduino outputs 5V (or some pins 3.3V) at max 50mA. ...
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votes
2answers
74 views
Passively Buffer Voltage
I am working on a project where I would like to use a single pole rotary switch as a mode switch, but also provide power to the MCU. By providing the common on the switch with 3V, I can identify what ...
0
votes
2answers
77 views
PLC Input Buffer/Driver
First post! Please bear with me...
I am an electrical tech and EE student with no design experience. This is the first circuit I've been asked to design. I have been given the task to take the input ...
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votes
1answer
60 views
What is the proper way to store data into a frame buffer?
I am trying to plan a graphics processor project that will only render lines. It will use the bresenhmam's line algorithm. After reading on the algorithm, it makes sense how it works to calculate ...
4
votes
1answer
73 views
Why is there a double inverting buffer instead of a single non-inverting buffer in this “equivalent logic” diagram? [duplicate]
In the datasheet for the DAC8812, there is this diagram in Figure 33:
What is the point of drawing cascading inverting buffers when, logically, it's the same as a single non-inverting buffer? This ...
0
votes
1answer
57 views
Active audio splitter (Line levels)
Hi all, I was looking for a simple splitter that replicates a line output into multiple of them, looking for the best circuit that meet my requriments I meet the user @Passerby, He had to share that ...
1
vote
1answer
62 views
Differential voltage to current converter
I have this circuit to solve:
with \$R_2=R_3\$ and \$R_4=R_5\$. I want to find the transfer function between \$I_{\text{out}}\$ and \$V_{\text{in}}\$ (differential).
I'm trying to use superposition, ...
1
vote
2answers
33 views
high output impedance sensor with voltage output
I've to design an input stage for signal conditioning of a voltage signal coming from an high output impedance sensor.
The sensor output impedance is 100k, and the amplitude of the voltage signal is 0-...
1
vote
2answers
51 views
AMP Circuit (Buffer)
Does any one know why the use if this buffer in the circuit? because I think there is no filter!!
Could anyone explain this please.
Thanks and best regards
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votes
2answers
45 views
Driving the outputs of a buffer
I have a card with a MC74HC125A used to buffer some SPI lines coming from a CY7C68013A USB controller. There are testpoints in place at the output of the buffers. I would like to tap into and supply "...
0
votes
1answer
37 views
Voltage buffer arduino voltage sense
I am using a resistor divider to an analog pin on Arduino to sense the voltage of a battery. I've recently been going through my IC's and found a device that can be used as a voltage buffer. I am ...
0
votes
1answer
82 views
Amplifying current using a buffer
The amplification of this amplifier is 1. So we have a buffer. But the question i wanted to ask was.
What can we tell about the current amplification of the circuit below? Is this circuit useful?
I ...
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votes
1answer
69 views
ADC front end buffer
I am trying to use MSP432 on chip 14 bit ADC to sense output from a current sensing op-amp.
I am getting a large reading error from my ADC compare to the multimeter reading.
Do I need to have a ...
0
votes
1answer
53 views
Why use a buffer in/output for a RAM memory?
I was reading about the architeture of a RAM memory but now I'm confused about the use of buffer for input and output. Why I need to use this?
2
votes
2answers
85 views
Why is there a buffer before an SD socket?
I'm studying the SD card section of an electronic circuit of Sparkfun can bus shield that I have to connect on a Nucleo STM32F411RE.
In the electriconic circuit, that you can see here.
There is a ...
0
votes
1answer
97 views
Op Amp as a buffer in lt spice for high voltage and high frequency
I want to make a buffer which can drive my sine wave with an amplitude of ±25 volts and a frequency of 25 MHz. Which Op amp in LTspice should i use?
3
votes
8answers
207 views
Lighting either of two LEDs, or none, based on digital input
I ran into a problem which I tought was extremely simple, and after giving it some thought for more than 2 hours I had to recognise it actually is quite complicated. The problem is the following:
I ...
2
votes
3answers
64 views
A threshold version of a CMOS 4050?
I want a buffer that outputs Vcc (of 5 V) when I give it voltage about a threshold, say 1.5 V. And it outputs Vss (ground) below that threshold.
I have a 4050 CMOS thing but I think it does not have ...
2
votes
1answer
62 views
How to read/write from a CPU using a usbWiggler?
Reading the Macraigor API for the usbWiggler
MacraigorApi_ JtagScanlO
...
1
vote
2answers
175 views
MOSFET voltage follower for non-inverting op-amp biasing
Question is based on this document.
Quoting from there:
Voltage Follower Biasing: This method is exactly the same as the voltage divider
biasing, except it uses an op-amp (or transistor) to ...
1
vote
1answer
62 views
Using an Op-amp buffer to Power Amplifier unit
I have an old amplifier unit that runs on A.C and I'm trying to make it a battery powered amp
I understand that the A.C voltage get rectified to 15+/15- D.C with a common ground so I used a 36v li-...
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votes
2answers
187 views
Reduce noise in this op-amp buffer circuit
I am using this op-amp circuit to buffer voltage (0-5V) received from MCU.
Resistors at the output are used to limit the current controlling the solid-state relay. However, (Vin) coming from MCU is ...
1
vote
2answers
209 views
74HC125 vs 74HCT125
I need an IC for two separate functions.
The first is level translation from 3.3 V to 5V, so that I can use a TFT touch screen with an Arduino Uno. In order for the touch function to work, level ...
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votes
2answers
70 views
What is the point of an input resistance on a tee to the ground in a buffer op-amp? [closed]
simulate this circuit – Schematic created using CircuitLab
Does it factor in to closed loop gain/bandwidth calculations?
1
vote
1answer
38 views
Which is better, single inverter or buffer + inverter?
I am trying to make a circuit that inverts a scaled (resistive divider) voltage using op-amps. I have come up with two ways to do it, but I'm not sure which one is better and why. I'm not ...
0
votes
0answers
169 views
How to create a solid virtual ground?
I am building a class D amplifier with an input 6.3mm jack and a single 12v battery. In my board I got 3.3v and 5v from linear regulators.
The ADC has [gnd, 3.3v] references and the microcontroller ...
0
votes
3answers
54 views
Can the /OE pin of a buffer be left floating?
Here is a buffer from OnSemi which has an /OE pin that should be tied high for high impedance mode. For all active modes the pin value is stated as low. Would my buffer still work if I were to leave ...
-2
votes
2answers
67 views
LV Voltage controlled buffer with Hi-Z
I need to control one digital signal with another. I need hi-z when the control signal is low, and non-inverting buffer when the control signal is high. I'd like to do this with few parts as necessary,...
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2answers
116 views
LT1010 (Unitay Gain Buffer) - Voltage output depends on load? (LTSpice simulation)
I need to drive a TTL signal into a 50ohm load (connected to a 5V supply, not to the ground) from a DAQ card that can only output 5mA.
I therefore looked around and found Linear Technology has LT1010, ...
2
votes
1answer
98 views
I2C PCA9600 logic side offset + ringing
I am using an NXP PCA9600 I2C bus buffer to drive a 2 meter cable in a two wire configuration. My clock is 100KHz. The bus voltage is 5V and the device sides are 3.3V. I have 350 ohm pull-ups on the ...
1
vote
2answers
79 views
How to connect VCC and GND conections of buffer 4050 on eagle?
I am unsing a 4050, the schematic usues the triangle representation.
I have added a VCC and GND connectors to a power supply of 3.3V in the schematic hoping eagle recognizes the connections, but the ...
0
votes
0answers
78 views
Glitches on the SPI Chip Select signal
Observation:
I am driving a chip select signal from FPGA through a bidirectional level translator to a PLL chip on my module for the configuring the PLL. I assert a high to low transistion for the ...
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votes
2answers
238 views
Understanding how a tristate buffer works (74LS241)
I'm trying to understand how the 74LS241 works. From what I read, if two input are high on a buffer, then the output will be high. For some reason, this isn't working on my circuit.
So here is ...
2
votes
1answer
146 views
How to increase fanout of CMOS buffer
I'm new to online forum. I want to interface 74HC541(Buffer) to 74HC574(D-f/f). The thing is 100's of D-f/f parallel interface as shown in figure(Fig.1).
Input and load capacitance limits it to 10 to ...
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votes
2answers
138 views
lm358 arranged as a 5 volt Buffer
simulate this circuit – Schematic created using CircuitLab
I am trying to connect my lm358 so that it acts like a buffer. I am connecting:
VCC to + 5 volts
Ground to Ground
Non-inverting ...
0
votes
2answers
53 views
Input buffer on a differential ADC
I am working on a AK5578 ADC, and the datasheet gives the following example for an input buffer :
I can't figure out the usefulness of the 10 ohm resistor on output of both opamps. Are they for ...
23
votes
3answers
3k views
What is the purpose a buffer gate?
As I understand a buffer gate is the opposite of a NOT gate and does not change the input:
However I sometimes see buffer gate ICs used in circuits and to an inexperienced eye they seem to do nothing ...
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2answers
194 views
Difference between buffer and mailbox
Peripherals in Micro-controllers usually provide a way for us to send and receive data from it. Usually this are memory mapped registers.
I have come across few terminologies. The most often used one ...
1
vote
1answer
64 views
How to get current to the load with a buffer Op Amp
I am reading about voltage buffer Op Amp configurations and it seems like there is no current through the circuit, specifically the load. So why would you want to get a specific voltage to the load if ...
0
votes
3answers
101 views
Are there better alternatives for these buffers?
I'm building a circuit that extract the DC component of an input signal, ,divide the DC component by 5, and finally add 2.5V it.
Here is the schematic of the circuit (the last op-amp is to invert ...
2
votes
1answer
306 views
This guitar piezo opamp buffer lacks any sort of bass, why?
My preamp in my acoustic guitar died after I put the battery in backwards. I need to replace it, and fast. Piezos have incredibly high output impedance (5+ mohm) so a buffer circuit is used to knock ...
11
votes
4answers
826 views
Is this clamping voltage divider for a high-impedance input a good, robust design?
I have an AC input as follows:
Can range from ±10V to at least ±500V continuously.
Runs from roughly 1 Hz to 1 kHz.
Needs > 100 kΩ of impedance on it, otherwise its amplitude changes.
May ...
4
votes
1answer
80 views
Is it safe to separate the power supplies for sensor, buffers, and ADC?
In the LT1054 datasheet it talks about needing a bjt to avoid pulling the VOUT positive with respect to GND (datasheet page 5 Vout (Pin5): http://www.linear.com/docs/2309).
Now I am powering an ...
0
votes
1answer
66 views
Voltage follower with a pair of matched FETs
I am studying for an exam and as a part of a question I have to explain biasing and operation of the voltage follower that uses two matched JFETs in the following arrangement:
I am not sure that I ...
0
votes
2answers
402 views
CMOS tri-state buffer internal structure
I was trying to understand the CMOS tri-state buffer internal structure with logic gates...
The image is similar to this one:
Anyway, I'm not understanding the logic I think something is escaping:
...
