Questions tagged [single-supply-op-amp]

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24 questions with no upvoted or accepted answers
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1answer
178 views

Single supply op amp with input attenuator

I'm designing a guitar headphone amplifier that uses a single supply op-amp as the output stage to the headphones. I'm using a potentiometer after the final JFET stage and before the op-amps as a ...
2
votes
1answer
198 views

pH sensor buffering, gain, and offset with one inverting opamp

I'm working on the above mentioned circuit. I'm a hobbyist with little electronics training so don't laugh if something terribly dumb comes out of my keyboard please. Anyway, a different question on ...
1
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0answers
87 views

Switching between outputs using irfz44n mosfet

In the circuit shown, the input voltage to the op-amp ua741 is 1V and the output will be 5.7V, which switches the bottom left irfz44n mosfet on and the off voltage irfz44n mosfet off. So i would ...
1
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0answers
74 views

Can this circuit be simplified?

The circuit is a LPF with a buffer stage in front of it that uses a linear pot. to control gain & attenuation. The setup is such that the response of the linear pot. is similar to a log. pot.. A ...
1
vote
0answers
272 views

Audible Ticking in Audio Opamp Circuit

I'm experimenting yet again with the following audio mixing circuit: On the scope with signal gen as source, everything looks great. When hooked up to the input of a mixer with a laptop as the source,...
1
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0answers
465 views

Output to ground rail on single-supply op-amp with grounded load

I'm having some problem comprehending the internal functions of op-amps and I'd appreciate any insight in to why my circuit behaves the following way: I'm working with TI's OPA548 op-amp (PDF ...
0
votes
1answer
36 views

Effective impedance calculation for noise removal from supply

I am working on single supply Op-Amp amplifier, referring to this post. While calculating the value of the capacitor C2, as to pass all the noise from the supply to the ground. I am unable to ...
0
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0answers
93 views

Opamp buffer output sine wave, is it normal?

I'm using this opamp - GS8331/32 to buffer voltage reference to ADC. Here my oscilloscope measure input and output of opamp: Why ouput is sine wave? Is it normal or because of my opamp? Any way to ...
0
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0answers
29 views

INA125 gain problems

I'm trying to use an INA125 to read a load cell. Its connected as in the single supply diagram in the datasheet (see below). The gain should be 4+60K/Rg. However whatever resistance I make Rg, the ...
0
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0answers
52 views

Remove Echo in an Op Amp

I have been working with a distortion circuit that has an op amp amplifying the volume before sending it through the diodes. The op amp is configured as a non-inverting op amp with a feedback resistor ...
0
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0answers
24 views

isolated and non isolated current and voltage sensing

I am designing Half bridge single phase dual loop(outer voltage and inner current) inverter with 120Khz switching frequency, and i want to sense inductor current and output voltage, conventional LV25-...
0
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0answers
79 views

What is wrong with this single supply opamp circuit for audio?

I am currently building an output stage for a DAC with opamps, in single supply configuration. Here is my circuit from LTspice: I have exactly built this on PCB, so I am talking about the real thing ...
0
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2answers
208 views

Differential Opamp Strange Behavior

I have no answer for this strange opamp behavior. The circuit shown is from a typical nonisolated ,Non grid-tie inverter product (imagine H bridge Inverter). which has a common -ve high power circuit ...
0
votes
2answers
69 views

op amp single supply with nonlinear gain below 1 and start offset

Is it possible to create a circuit with an op amp (single supply) that have a nonlinear gain (below 1) slope and a start offset? See image Green = input Red = output
0
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1answer
249 views

Instrumentation Amplifier input saturation problem

I designed and ordered some PCBs for in-amp but having a problem, I think it is input saturation. The power supply is 0V, 6V, and 12V rather than -6V, 0V, 6V but I am only interested in AC so this is ...
0
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3answers
226 views

OpAmp VS Voltage Divider VS Buck Converter (Current Sensor Output)

I'm working on part of a project and I need to build the circuit that reads the current through a phase of a motor using this IC from Allegro. Assuming there will be no more than 5A, and using a VCC=...
0
votes
1answer
514 views

How to calculate frequency of this Op Amp square wave oscillator?

I was trying to come up with the equation to calculate the frequency of this circuit. R1 and R2 are creating analog ground because I am using bipolar op amp for a single supply operation. Thank you ...
0
votes
1answer
212 views

OpAmp for FOC current sensing on a BLDC/PMSM

How critical is this pull-up resistor to Vdd for current sensing in a Field Oriented Control of a BLDC or PMSM? Right now, I don't have that pull up...I'm running the shunt resistor voltage straight ...
0
votes
1answer
154 views

How to make LT1168 instrumentation amplifier work with single supply?

I am using the LT1168 instrumentation amplifier for my project and I am trying to figure out how to make it work with a Li-Poly 3.7 Volts battery. I am not able to understand the single supply ...
0
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0answers
56 views

Two Op Amp In-Amp Voltage output

I mounted the following circuit using a LM324, where Val = 5v, Vref = 1.78v, R6=18K and R7=10K. I measured Vu and i'm getting a very close value to Vref, why? Edit: V- and V+ are connected to Vref ...
0
votes
2answers
70 views

Can I bias this circuit to zero

H i, I am new to this, so please excuse my lack of knowledge. How can I bias this to zero, and is there a way to increase the dynamic range. I will mbe using this as a sound trigger for an arduino ...
0
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0answers
235 views

Principle for converting dual power supply to single

I was recently attempting to build a voltage controlled oscillator from this website: http://www.schmitzbits.de/vco4069.html. I struggled with it, for various reasons, and eventually found this ...
0
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0answers
2k views

Calculate the gain of the instrumentation amplifier for an input current I

I'm a little confusing to calculate the gain of my instrumentation amplifier due to different variables and conditions that may influence the gain. I am creating a project, which needs to inject a ...
0
votes
1answer
106 views

Voltage scaling of analog signal -10 to +10V to 0 to 3V inorder to give it as input to ADC using opamp TL082 and TL431

I have a sensor which gives an output of -10 to +10V, I need to scale down it to 0 to 3V in order to give it as input to ADC of microcontroller. I have opamp TL082 and TL431. I have attached a ...