Unanswered Questions
564 questions with no upvoted or accepted answers
12
votes
1
answer
598
views
+50
How to understand a complex diode-resistor function generator circuit?
I'm reverse-engineering a CRT anti-pincushion circuit and it uses a complex diode-resistor circuit to approximate the function \$X-k×X×Y^2\$, where \$X\$ and \$Y\$ are the deflection voltages. My ...
- 11.6k
7
votes
2
answers
273
views
Phase shift near saturation mitigation in input stage amplifier -- How does this work, why does this work?
I'm trying to understand how this circuit works on the input stage to the 4192A Impedance Analyzer.
Apologies for the quality... this is the best scan I could find. The design is furnished with the ...
CommunityBot
- 1
5
votes
0
answers
280
views
Detection of CT secondary subsidence current
In utility power system protection we have a protection function called "breaker failure" protection. This protection is used to take appropriate action if/when a circuit breaker fails to ...
- 3,497
5
votes
0
answers
152
views
imx6q sabre board microphone
I have been trying to record audio using the circuit below. It is different from the normal microphone circuit in that the MIC_IN and MICBIAS are separate paths. I tried to connect an electret ...
- 711
5
votes
1
answer
850
views
Switching relay on and off affects analog sensor output voltage
I am working on an AVR project that involves measuring tempereture with an analog sensor (TMP36) and switching a heater on and off through relay to keep the temperature at desired level.
However, I'...
4
votes
0
answers
59
views
Sinking an input when pulses are above a certain frequency
I'd like to use a liquid flow meter of type YF-S401 at 12VDC. It produces 1.7-35k pulses per minute (rise time: 0.04us, fall time: 0.18us).
I want to trigger a sinking input of a controller board if ...
- 221
4
votes
0
answers
115
views
I have a question about the datasheet for AD8330 VGA (variable gain amplifier)
I don't have much experience reading datasheets. I was reading the datasheet for AD8330 VGA. I did not understand what the difference is between VDBS and VMAG. Can someone elaborate on that?
It's ...
- 17.9k
4
votes
0
answers
106
views
Audio amp IC: how does this output stage work?
I'm looking at an audio amplifier integrated circuit and the output stage seems a bit unusual. Has anyone seen this style of output stage, and does it have a name? And can anyone fill in the details ...
- 2,884
4
votes
0
answers
2k
views
100kHz active filter design
I am designing a basic 100kHz active bandpass filter using opamps (LF353). I am only interested in receiving the 100kHz frequency (might drift a few kHz) from my input signal. I have used a basic ...
3
votes
0
answers
138
views
50 Ohm-Terminated Antenna Oscilloscope Readings
As a follow up to my previous question about measuring antenna performance via amplitude at 88 MHz to 108 MHz on a DSOX1102G oscilloscope, can I trust these new readings? Measurement channel is on 1:1 ...
- 570
3
votes
0
answers
69
views
How to use current sources correctly
In this simulation the circuit generates a AC signal at "Electrode". Here I am using two SPDT-Switches (Ron = 4 Ω).
My first question: Why isn't the signal correctly rectangular? And how ...
- 9,270
3
votes
0
answers
859
views
PWM to synth control voltage improvements
Just built this little circuit to control my Moog Werkstatt. The plan is to make a MIDI-to-CV converter and add more CV outputs and of course a GATE output later. But before going further, I thought I'...
- 43
3
votes
0
answers
316
views
How does the biasing work in a JFET based triangle to sinewave converter?
To those who haven't see this cool little circuit it employs the non-linearity and symmetry of the JEFET to clip a triangular signal to make it more sinusoidal
Can someone please explain to me how ...
- 377
3
votes
0
answers
104
views
Noise immunity of single ended analog voltage signal
I want to use a sensor with analog output in my design. The output of the sensor is a low frequency traingular wave (less than 300 Hz) and voltage vetween 0 - 5V. I need to carry the sensor signal to ...
- 31
3
votes
1
answer
221
views
Why do PMOS suffer a worse body effect than NMOS?
Gray, Hurst, Lewis, and Meyer give the following discussion around PMOS transistors which I followed except for the sentence which reads:
Good use can be made of this fact in analog circuits to ...
- 1,161