Questions tagged [offset]
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141 questions
9 votes
3 answers
778 views
Add fixed offset frequency to incoming signal
I have a project where the incoming signal is a sine wave that ranges from about 300 Hz to about 750 Hz. The client wants me to add a fixed offset frequency of about 185 Hz so that the output signal ...
- 24.6k
3 votes
1 answer
94 views
Effect of op-amp offset when \$V_{in} \approx V_{OS}\$ in a log amplifier
In the standard log amplifier (op-amp with BJT in feedback, resistor \$R_1\$ at the input), I modeled the op-amp input offset as a small DC source \$V_{OS}\$ at the non-inverting input. Assume \$V_{in}...
- 119
0 votes
1 answer
103 views
Predicting resistance measurement error
I am dealing with a setup where resistance of a resistive DUT (Device Under Test) is measured by sourcing some current through the DUT from a current source and by measuring the voltage drop across ...
- 197
1 vote
2 answers
138 views
Choices for R1 and Rf for a non-inverting op-amp
I am using designing gain and offset in thiry seconds, Texas Instruments as a guide to add offset and gain to a specific analog signal using an op-amp circuit. The input signal is a sinusoid with Vmpp ...
- 13
0 votes
0 answers
59 views
VFD offset tutorial
I am trying to understand VFD's (Variable Frequency Drives) concept of 'offset' What is this feature? When do I use it. What does it achieve. I have searched Youtube: lots about VFD but can't find ...
0 votes
1 answer
163 views
Voltage amplifier for a triangular wave using 2N2222 BJT
My task is to amplify the voltage of a triangular wave which is between 100mv and -100 mv, so I design a common emitter circuit to do it, but when I check the vout I see that my output wave is already ...
- 1
0 votes
1 answer
61 views
HCPL2531 offset voltage status at opto output
I am testing in a panel with very high motor noise. I want to pass the encoder data through the opto. When I apply the following scheme, my inputs and outputs are as I want. Giriş Çıkış Then I ...
0 votes
2 answers
164 views
Circuit that offsets input voltage to exactly 0 V
I am looking for a (op amp) circuit to offset \$f(x)= \log(x)\$ always to zero. More comprehensible is the explanation on the x-y plot below. Basically, it is possible to offset the voltage with an ...
- 19
1 vote
3 answers
259 views
How to offset a sinusoidal voltage centered at 0 V for power grid measurements
I am trying to take voltage and current measurements from the power grid (120V 60Hz) and process them with a 3.3V based digital signal processing board (TI F280049C launchpad) I am using LV25-P and ...
- 19
1 vote
1 answer
240 views
Negative offset voltage on analog input in data acquisition device (DAQ) connected to a photodiode in the dark
I have a data acquisition device (DAQ): USB-6002 from National Instruments (NI). I am recording an analog voltage from a (cathode-grounded) photodiode through a variable resistance (50-100k Ohms). I ...
- 63
0 votes
1 answer
107 views
Scale and offset voltage range from DAC to VCA
Still tinkering with my VCA based effect mixer. I control multiple DACs (MCP4922) which send control voltages to the VCAs (AS2164). Until now I've just fed the DACs a reference voltage of 3.3V to ...
- 73
2 votes
1 answer
315 views
Why will the offset of a source-follower which is connected to the output of an opamp as a voltage buffer limit the op-amp output swing?
I am currently reading chapter 12, "The Common-mode Feedback Circuit" in Analysis and Design of Analog Integrated Circuits by Gray and Hurst. Page 815, gives the following statement for ...
- 113
0 votes
1 answer
683 views
Control (0 - 10 V) fan from LM358
I want to generate output of (0 - 10 V) from ESP32 GPIO (0 - 3.3 V). Basically fan is connected to the output. I am attaching a circuit of it. Do I need any changes in the design or it will work? Will ...
0 votes
1 answer
322 views
How to add an offset to a PWM signal to control a N-channel MOSFET that has a large source voltage?
I want to control a N-channel MOSFET through a PWM signal generated by an Arduino board. The amplitude of such PWM is 0V-5V with respect to GND with frequency 20kHz. My idea is to send the PWM signal ...
- 113
5 votes
4 answers
1k views
Can't exactly adjust the offset in an op-amp circuit
I'm trying to make a neat and obvious circuit for amplifying a 0-3.3V PWM signal to -10/+10V. I'm able to adjust the gain and feed the signal on the inverting end. I also want to add a 1.65V (3.3V/2) ...
- 289