All Questions
Tagged with load operational-amplifier
18
questions
0
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answers
59
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How can I sum the output of the two opamps and multiply the voltage swing to +2vcc and -vcc
I have a VtoI circuit that you can see in the figure below. According to this circuit, I can receive a maximum sin current of 4 mA with a maximum load of 5 kΩ. Considering that the supply voltage for ...
- 1
5
votes
6
answers
2k
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Purpose of 1 kΩ resistor in parallel with load at output of op-amp
As I was reading some op-amp data sheets, I noticed they placed output resistors to ground in some test circuits. These can be seen in the insets of the plots below for the LTC6228 and the LT6202.
...
- 365
2
votes
1
answer
291
views
How to buffer an AM signal?
The above shows an AM modulator circuit which sums a sine wave and a triangle wave to produce an output which will undergo resonance using RLC to produce an AM signal.
The TL072 is commonly used in AM ...
- 541
1
vote
3
answers
298
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Load impedance seen by op-amp
I have a question about the load impedance seen by an ideal op-amp output terminal in inverting configuration.
When calculating the load impedance, we set Vin = 0;
In one way I could say that the ...
- 13
2
votes
1
answer
203
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Estimating load capacitance when connecting two opamps?
I plan to use the OPA657 as a charge sensitive pre-amplifier for measuring the output from a reverse biased PIN photodiode. I would like to further amplify the signal using a wideband EL5163 opamp. ...
- 1,137
2
votes
1
answer
164
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How does complex loading affect an op amp's power dissipation
I'm trying to calculate power dissipation in a complex load. I know that the power loss due to the resistive component is dissipated, and that the power loss due to the reactive component is canceled ...
- 539
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0
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251
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Drive Capacitive load with toroidal transformer
this question is related to my previous post:
Toroidal transformer voltage breaks down
I am trying to build a circuit that drives a capacitive load (approx. 9nF) through use of a toroidal transformer. ...
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votes
2
answers
689
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Driving an audio speaker design questions
I have been dealing with some project in which I have some requirements to accomplish. For now, I am dealing with the first part and a quick story is,
I have to generate a sine wave at a certain ...
- 2,106
-1
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1
answer
118
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Which load resistance is connected to generator U2?
I have this op amp and one of the questions says
Which load resistance is connected to generator U2?
This is my attempt but I can not confirm if it right.
No it's not homework, it examples I'm ...
0
votes
2
answers
1k
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Can any type of op amp output stage be forced into Class A operation?
I'm trying to choose a good op amp for a Class A small signal audio amplifier circuit.
I've done my research and understand the use pull up or pull down resistors externally to force Class A ...
- 31
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votes
2
answers
1k
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OpAmp with high output current and capacitive load
I am trying to solve the following problem which - until today - I thought to be a trivial one: I have multiple reference voltages (from different sources) that I need to buffer and/or invert, filter ...
- 1,326
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votes
2
answers
131
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Adding a constant load to the input of an Opamp
I was looking at this circuit, and there was a resistor connected to ground after the output of a signal generator(50 ohm on the top left) . The explanation was that adding it allows the signal ...
- 25
5
votes
2
answers
399
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I know it has small phase margin.. but why is it oscillating not at rails?
I came across an issue at my workplace with the following circuit. I did a OL response and saw that the gain margin is 21 db and the phase margin is 14 deg. Clearly not so good. Note that the 680nF ...
- 312
0
votes
3
answers
2k
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OP amp PI controlled electrical load
I am building an electrical load, capable of "sinking" 0 - 3A on a maximum of 60VDC. I want to control the load with a microcontrollers ADC (0-3V). On the internet you find hundereds of circuit ...
- 33
1
vote
1
answer
1k
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Stabilising a constant current load opamp feedback loop
I designed a constant current load around the ACS712 Hall-effect current sensor (module from eBay). This module gives a voltage output of 185mV/A superimposed on VCC/2. Its current range is +-5A altho ...
- 113