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Results tagged with operational-amplifier
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user 150193
Questions relating to the construction and applications of operational amplifiers, which are DC-coupled, high-gain electronic voltage amplifiers with a differential input and, usually, a single-ended output.
0
votes
1
answer
80
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What is the difference between the 3 circuits? (OP-AMP)
I found different circuit diagrams, but I don't know what is the difference betwwen these ciruits? When which to use?
- 327
1
vote
3
answers
178
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Why doesn't work this circuit? I would like to sense the temperature raising
I would like the following:
Once the led gets active, stays active until I disconnect the power supply.
I tested it with this simple circuit, but it didn't work. When the temperature increased the N …
- 327
0
votes
3
answers
3k
views
I would like to make a low-battery cut-off ciruit with a P-MOSFET. How can I modify this cir...
I would the following:
When the LM358 non-inverting pin voltage greater than 1.00V then the batteries are empty and the output go high. I would like to turn the P-MOSFET off, but its not nowrking now …
- 327
0
votes
1
answer
212
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How can I modify this voltmeter circuit to show 0.00V when nothing connected to the output
I have a voltmeter and ammeter combo which sense the voltage and the current at the output. My problem is when nothing connected to the output it shows 0.06V else 0.00V. I tried to connect the output …
- 327
0
votes
1
answer
304
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What is the problem with this circuit? ( MOSFET + OPAMP) Battery protection circuit (draw cu...
I would like the following:
10 X 1.2V battery
left mosfet is the ON-OFF mosfet. I can ON and OFF the whole circuit with the 'SW' switch
The two LM358 opamps sense the 1st battery voltage
IF the volt …
- 327
1
vote
3
answers
561
views
How can I modify this circuit to if once the battery turned off, never turn on again or turn...
I made this circuit:
I would like the following:
The LM1 opamp wathching the battery voltage and the output high while the battery voltage higher than 3V. When the voltage drops below 3V, the opam …
- 327
1
vote
1
answer
211
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How should I modify this circuit to see exactly if the batteries fully charged or still not?
I made this circuit:
The op-amp is LM358.
The problem with this ciruit if the charging current get to drop about 0.10A the red and the green leds are flashing together. I want the following: if the c …
- 327
1
vote
1
answer
556
views
Why mosfet doesn't turn off when battery voltage is low?
I would like to protect the batteries from over discharge, so I want to make a protection ciruit.
I made this:
I want the following: 2x 9V battery in series, so total voltage is 18V. The regulator …
- 327