All Questions
Tagged with protection operational-amplifier
26
questions
0
votes
1
answer
82
views
Will voltage at the inputs/outputs destroy an unpowered opamp?
I have a circuit powered by 12V that accepts an input signal of 0V to 10V. The circuit shall act as a buffer to the signal, with an added LED indicator. In certain circumstances, the circuit itself ...
4
votes
4
answers
645
views
How to prevent this op-amp from railing
I have the following circuit:
An input that can go negative (+/-5 V sine wave), and two inverting op-amps. The second op-amp is "current buffered" and is driving the base of a BJT.
Here is ...
- 395
1
vote
2
answers
175
views
Operation amplifier input HV protection
I have a setup consisting of 8x AD8428 ultra-low noise opamps on a PCB to measure very small voltages with a noise floor of around some 100uV and a low-pass filter up to 10kHz. The input is connected ...
- 103
2
votes
2
answers
94
views
Dual Rail Reverse Protection Circuit for OP AMP inputs
Is there a way to resolve this? When wrong polarities is applied,then I wanted no voltage or current flowing towards the OP Amp. Thanks!!
- 21
0
votes
1
answer
100
views
PSPICE non sinking voltage source
In an ideal world, most power supplies have a current sourcing feature but not a sinking feature. In this circuit, you can see that the 15V supply is sinking current. How can I prevent this in Pspice?
- 756
0
votes
2
answers
124
views
Opamp output clamp
During power-up, U2A's voltage will be undefined. I would therefore like to clamp it with a relay. Additionally, U2A is buffering a voltage from a 20-bit DAC -- therefore I need to care about thermal ...
- 359
2
votes
2
answers
1k
views
Series resistor on op-amp input
There is a related question similar to mine: Op Amp input protection,
but I found this other configuration:
where the series resistor is placed after the TVS diodes.
What is its purpose? The input ...
- 1,235
0
votes
2
answers
215
views
How to size overcurrent protection?
I'm a begginer in electronics so I have some very basic questions.
I would like to protect an OpAmp power supply rails from overcurrent. But I don't know at what value I should set this protection.
...
- 51
0
votes
3
answers
2k
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What is the problem with connecting a negative voltage to an op amp's negative lead while the possitive one is grounded?
I'm reading a manual on op. amps that presents the following schematics:
And says:
[Context: Vin goes from -0.1V to -1V]
When Vcc is powered down while there is a negative voltage on the input ...
- 1,259
0
votes
3
answers
1k
views
Protection diodes in an audio amplifier
How do the diodes protect the input of amplifier from excess voltage in the circuit below?
- 5
0
votes
1
answer
3k
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Opamp output short circuit protection
I am trying to build a voltage generator 0-10V to feed the input of a PLC ADC card (for simulation purposes). The PLC card has an input impedance of 133k.
I am thinking to use the circuit from the ...
0
votes
1
answer
359
views
RTD circuit in industerial application
I'm trying to design RTD measuring for industrial use which has EMI/EMC/ESD.
I have 3 wires input to the board.
obviously 3 wires out of the board are going to 3-wire configuration PT1000
1- 3V3 (...
- 499
3
votes
1
answer
2k
views
Op Amp input protection
I was looking for an Op Amp input protection circuit and the most common I found looks like this.
When the voltage at Input Signal goes above/below Op-Amp's supply ...
- 2,053
3
votes
1
answer
182
views
Protecting opamp inputs when powered down
I'm designing a circuit with an opamp buffer at the input, which runs of batteries.
As the input does what it likes, the input of the opamp can see voltage even when the opamp is powered down. As the ...
- 279
0
votes
1
answer
430
views
How build a practical AC over voltage protection circuit for the input of an arduino board
The input signal to my board is an AC signal.
My board will process this signal. My board can handle 3.1Vpk-pk maximum without any damage occurring.
In the event that my input signal exceeds that I ...
