Output Voltage Calculation for Difference Amp Circuits

AI Thread Summary
The discussion focuses on calculating the output voltage of a difference amplifier circuit using the formula (R2/R1)(V2-V1), while considering the ideal op-amp rules that state the voltage between the inverting and non-inverting terminals is zero and that no current flows into these terminals. Participants emphasize the importance of relating the output voltage to the source current through a loop equation. There is a request for assistance in solving the problem, with a reminder to show work for better support. The thread also notes that if it becomes a homework-related inquiry, it may be moved to a dedicated forum. Overall, the conversation seeks clarity on applying theoretical principles to practical circuit calculations.
math&science
Messages
24
Reaction score
0
I know the output voltage for a difference amp is (R2/R1)(V2-V1) but how do you find the output voltage when you connect the circuit attached to the difference amp where V1 and V2 are the input voltages to the difference amp?
 

Attachments

Engineering news on Phys.org
Apply the usual rules for ideal op amps. That is, the voltage between the inverting and noninverting terminals is zero and the current flowing into these terminals is zero.

It may then be helpful to write the output voltage as a function of the source current. A loop equation will relate the source current to the source voltage.
 
Amp Wise said:
I have the same problem. I hope someone can help us.

_________________
http://www.who-sells-it.com/cy/mcintosh-laboratory-inc-1500/ma2275-integrated-amplifier-5972.html - MA2275 Integrated Amplifier Catalog by McIntosh Laboratory, Inc.

mdelisio did help. Show us your work so far, and we can help if you're stuck on something or making some math errors.

Welcome to the PF, BTW. Note though that homework and coursework will generally need to get posted in the Homework Help forums, and you need to show your work so far in order for us to help you (PF rules). I let this thread stay here in the general EE forum up to now, but if it turns into a homework thread I'll go ahead and move it over to the Engineering Homework Help forum.
 

Thread 'What happens if shielded cable has a short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Thread 'How might electronics be different if AC voltage was 72V at 45 Hz?'

Hey guys. I have a question related to electricity and alternating current. Say an alien fictional society developed electricity, and settled on a standard like 73V AC current at 46 Hz. How would appliances be designed, and what impact would the lower frequency and voltage have on transformers, wiring, TVs, computers, LEDs, motors, and heating, assuming the laws of physics and technology are the same as on Earth?
View full post »

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Similar threads

DC input random offset voltage for diff. amplifier with current-mirror load
Replies
2
Views
1K
How to figure the voltage drop at different points along a circuit?
Replies
38
Views
6K
Designing a 24-100V to 12V Buck Converter Circuit
Replies
32
Views
5K
Sizing an Isolation Transformer for a DC Power Supply
Replies
8
Views
2K
Subtracting AC Voltages for Audio Amp Simulation
Replies
6
Views
2K
How to enhance output Voltages of this RF Power Amplifier
Replies
16
Views
2K
Amplifier for piezoelectric sensor, OP Amp circuit
Replies
6
Views
5K
How do I get a DC difference amplifier working?
Replies
15
Views
3K
Calculate the size of fuses to use
Replies
10
Views
3K
Heavy Amplifier Circuit Oscillation Happened
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top