Electronics > Projects, Designs, and Technical Stuff
weird opamp configuration
stojke:
Can anybody help me find which opamp actually works in this configuration?
In the original design the output should be a lot higher (max , ~16V), but none of the opamps I have tried worked as they all acted as an voltage follower taking the whatever is on the input with out any amplification directly to the output.
The schematic tells its an NJM4580D-D, but an NJM4580D I tried does not work.
wraper:
--- Quote from: stojke on January 18, 2019, 10:02:59 pm ---but none of the opamps I have tried worked as they all acted as an voltage follower taking the whatever is on the input with out any amplification directly to the output.
--- End quote ---
Of course they do. Because gain is 1. It's exactly how it should operate.
http://www.learningaboutelectronics.com/Articles/Voltage-follower
stojke:
Trust me, it should not be working as an voltage follower, it is the last opamp stage before the main amplifier. In original design it "should be" 16V on the output.
wraper:
--- Quote from: stojke on January 18, 2019, 10:18:57 pm ---Trust me, it should not be working as an voltage follower, it is the last opamp stage before the main amplifier. In original design it "should be" 16V on the output.
--- End quote ---
Do you see inverting input directly connected to the output? That is called voltage follower :palm:. There is a link in my previous post, and if you don't trust it, google "voltage follower".
mk_:
--- Quote from: stojke on January 18, 2019, 10:18:57 pm ---Trust me, it should not be working as an voltage follower, it is the last opamp stage before the main amplifier. In original design it "should be" 16V on the output.
--- End quote ---
This is a voltage follower with gain=1, show the whole schematic to verify your hypothesis
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