Tagged Questions
-1
votes
2answers
119 views
threshold problem on a Schmitt trigger op amp
I have the Schmitt trigger op amp on the below diagram. (channel A & B refers the oscilloscope probes on the following figures).
The resistor values are selected to set the trigger threshold as ...
-5
votes
0answers
51 views
Measuring voltage change between two separate circuits [closed]
Is it possible to measure a voltage produced from one circuit in another which is powered by a different cell / power source.
To give a simple example, is it possible to have a potential divider on ...
1
vote
2answers
98 views
Tips for adding voltage op amp to equipment
I have a source that creates a smooth sine wave in the range ±100mV at 1-15Hz.
Due to distances I need to amplify the signal to at least ±5V, and I should also maintain the shape of the signal if ...
2
votes
3answers
278 views
How do I calculate the gain of an op-amp summing amplifier?
So if I have a summing amplifier circuit like the one below:
I know the Vin1, Vin2, and Vout value and the circuit is designed such that Vout = -(Vin1+2Vin2) but how do I calculate the gain? I know ...
0
votes
1answer
136 views
Nulling Offset Voltage
I am using a ua741 op-amp. My question is, how can I use a potentiometer to null the output offset voltage?
I believe if I'm correct, that output offset voltage means the output voltage provided by ...
1
vote
1answer
91 views
Op Amp different supply voltage than signal voltage
I need to setup a differential op amp. The question I have is if the source signals (from the sensor) can have a differnt power supply than that powering the op-amp. The op amp will be sent to a ...
1
vote
1answer
134 views
What opamp characteristics for voltage reference
What opamp datasheet characteristics should i look for when choosing an op amp to proivide a reference voltage like in the following image?
4
votes
2answers
239 views
op-amp circuit to transform input signal
In this typical op amp circuit, how would I go about calculating the value of each component if I want to simply transform the input voltage range into another voltage range, e.g. when input voltage ...
-2
votes
1answer
171 views
OP AMP amplifier [closed]
I am building a simple op amp amplifier circuit using IC LF351. I m using this circuit at very low voltages about 100mV. however the gain does not remain the same at this voltage. Like the theoretical ...
-1
votes
1answer
164 views
Types of amplifier - what is the difference?
What is the difference between an open loop amplifier and a voltage follower (unity gain buffer)?
1
vote
1answer
83 views
Wingman Wheel with different power supply? [closed]
I have an old Wingman Formula Force running on 20V / 1.5A, and I've lost my original cord/power supply.
I have 2 other supples in here, one with 12V / 2.5A
Second is 22V / 1230mA (guessing that's the ...
4
votes
3answers
4k views
Analog voltage level conversion (level shift)
I have a joystick that puts out analog voltage somewhere between 1.5V and 3.5V.
I want to transform this range of voltage to control a motor controller that takes analog voltage between 0V and 5V.
...
2
votes
1answer
225 views
Water Meter Monitoring
Working on a project where I am wanting to monitor water meter via a magnetic sensor which will detect the spinning magnetic disc. It's very similar to the project this person has accomplished:
...
2
votes
4answers
386 views
Minus Voltage & Ground
Sometimes i come across different notations in Op Amps. Sometimes they are fed by V and ground, sometimes +V and -V. I am confused. Does ground mean minus?
Look at here:
...
1
vote
2answers
1k views
Postive input ==> Positive and Negative output
I was watching some tutorials on thesignalpath.com and came across something that I didn't quite understand (even after it was explained).
toddrharrison
August 21, 2011 at 6:29 PM
Answer ...
2
votes
1answer
313 views
Applying an oscillation to a DC voltage?
I've lost a 555 IC that I had owned, so thought I'd make an relaxation oscillator for practise out of an operational amplifier:
The example of the simulator I have been using creates a square wave ...
0
votes
2answers
848 views
Can I use a voltage divider and/or voltage follower to produce 1V from 9V for an op-amp oscillator?
For a circuit I'm building, I'm using an op-amp oscillator to generate a sine wave. The sine wave will have a maximum voltage of 1V and a minimum voltage of -1V. The circuit will be powered by a 9V ...
4
votes
3answers
701 views
Basic 741 Op Amp Question
I am trying to build a basic 2 input summing amplifier using radio shacks 741 op amp. I have a feeling I damaged my IC chip through my wacky experimentation's. But lets run through the math just in ...
3
votes
4answers
896 views
What is the purpose of this op amp?
I am trying to build a pH meter using the below circuit.
I am trying to understand the function of Op Amp U1. As I understand it, the LM4140A-1.0 is a voltage reference outputting 1.024V, which is ...
4
votes
6answers
610 views
Input voltage range of opamps
I understand that, for an ideal opamp, Vo is bounded by Vee and Vcc (i.e.; Vee < Vo < Vcc).
But, what about the input voltage range? What is the allowed input voltage range in which opamp ...
4
votes
4answers
3k views
Negative voltage from Arduino?
I recently got a INA101HP see picture below. I was trying to use it on a breadboard. To power the op amp I connected 5V to +vcc pin but then I realized I did not really get how to provide -5V for the ...
