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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
If I'm not wrong, the highlighted part is a differential circuit. I found out that the voltage at point 1 is 4V and point 2 is 4V too. So what is the use of a differential circuit?
I've measured the voltages at both inputs, which are pin 9 and 10, 2V and 3V respectively. I am using 5V VCC by the way. So the difference between this 2 points is 1V. But how does it amplify the 1V to become 4V?
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