All Questions
Tagged with probe operational-amplifier
12
questions
1
vote
0
answers
136
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Circuit works only when oscilloscope probe is connected and does not work otherwise
I have built the circuit shown below.
The problem is that the circuit only works when I connect oscilloscope probes between node-A and the ground.
If I remove or decouple the probe-ground from the ...
- 11
0
votes
2
answers
256
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Unknown interference between signal generator, oscilloscope, and op-amp
simulate this circuit – Schematic created using CircuitLab
I am new to hardware experiments, although I have acceptable theoretical knowledge. My setup is:
a signal generator
a breadboard with ...
- 11
0
votes
3
answers
679
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My Wien bridge oscillator doesn't work, what could the problem be?
I suspect I am making a probe connection mistake, but couldn't figure it out.
The circuit works fine in LTSpice but I don't get anything in a real experiment.
What might be the problem?
1
vote
1
answer
271
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How can I implement a differential input for a logic analyzer probe?
I'm currently working on a project to build a portable logic analyzer. There will be 4 input channels to the design, however I was highly recommended to redesign this using a differential input to ...
- 31
5
votes
2
answers
671
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Criticism of my differential pH probe design
I finished and tested with buffers this little differential pH probe on a perfboard, it works, 3 points calibration is linear. The ground electrode is a stainless steel rod wired to the GND of the ...
- 115
24
votes
2
answers
12k
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Review request: DIY DC to 50MHz differential oscilloscope probe
Given the cost of proper differential probes, i've decided to make my own. The requirements are:
DC to 50 MHz 3db bandwidth
A few selectable input voltage ranges, from 3V pk-pk to 300 V pk-pk
...
- 8,661
0
votes
2
answers
1k
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How to make a symmetrical DC power source?
I have been tasked with creating a logic probe that reads High/Low/High Impedance, but what works in simulations, isn't working in practice.
This was my idea:
I made a symmetrical power source using ...
- 19
0
votes
1
answer
4k
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How to measure 120 V, 60hz with an oscilloscope? [duplicate]
I wanted to measure the voltage of the electrical outlet. I wanted to see the signal with an oscilloscope, but I don't want to break it down. What is the best way to do that?
I have seen that some ...
- 515
0
votes
1
answer
135
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how to setup a ph sensor probe
I have a INA126 IN-Amp. I hope to use it with a ph probe. But I am not sure exactly how to do that. should I put the probe in series with a branch of a resistive wheat stone bridge, or just tie it to ...
- 387
1
vote
1
answer
148
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Understanding the capacitors in an op amp circuit
I am a computer programmer forced to make some circuits for a Langmuir probe our lab is making (the main task is programming the analytic software on the computer, but I have to make a basic amplifier ...
18
votes
4
answers
15k
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Is this a good design & layout of an active differential 'scope probe?
This question is an extension of Homebrew differential 'scope probe. I thought I should make this a new question though.
I need to measure a 100Mb/s LVDS signal to check its integrity. I will try to ...
- 27.5k
11
votes
1
answer
4k
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Homebrew differential 'scope probe
I may be able to get my hands on an old 600MHz LeCroy oscilloscope. However, it doesn't have any probes.
Is it feasible to make an active differential probe for it using a high-speed op-amp, like the ...
- 27.5k