Tagged Questions
1
vote
1answer
90 views
Find Vo in an op-amp - transistor circuit
I have a schematic with this system and can't find out how it works:
simulate this circuit – Schematic created using CircuitLab
How do I find Vo in this network? Please explain it "for ...
15
votes
2answers
1k views
Why would an op-amp use BJTs over MOSFETs?
I've always been told that ideally, op-amps have infinite input impedance. So when I was looking at the LM741's transistor level schematic, I was confused when they used BJTs instead of MOSFETs.
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1
vote
1answer
159 views
Calculating node voltages
This question is somewhat modified from the original which was asked by someone else. Note that there is more to this than meets the eye. The OP07 or OP070xxx is a 30+ year old op amp, the transistor ...
2
votes
2answers
154 views
OPAMP has voltage on its supply when it shouldn't
I was trying to design a circuit after seeing this question. I know I used too much components than I should designing a circuit with this purpose. And sorry about the messiness of the schematic.
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2
votes
1answer
404 views
Voltage controlled voltage source
I am designing a high powered LED driver controlled by a microcontroller.
Now it would be very easy to make a constant current limiter so I don't burn out my LED. I have a bunch of LM317's and ...
1
vote
2answers
660 views
Operation Amplifier with Transistor output
Is there a name for feedback amplifier topologies which include an opamp and transistor in the feed-forward path?. I need to design an amplifier with high bandwidth (almost 100 MHz) and high gain (50) ...
