Table of Contents
Direct op amp negative feedback , where the output is connected directly to the inverting input (-), results in the output voltage being the same as the voltage being applied to the non inverting (+) input.
- Output voltage goes up if + input is at a higher voltage than the – input. Whereas the output voltage goes lower if + input is at a lower voltage the – input.
- Once the output gives the – input the same voltage as + input, then the output voltage holds steady. If it can’t, then it stops at the op amp’s output limit.
- Blue LED in the demonstration circuit starts to light up when the output voltage drops to about 3 volts below the supply voltage of 5V. That’s 2 volts or less relative to 0V ground.
- Red LED in the demonstration circuit starts to light up when the output voltage rises above about 2 volts.
Assorted integrated circuits (ICs) kit. Included is the LM358, NE555 timers and other commonly known ICs. I have previously covered some of the other ICs in YouTube videos. It is an Affiliate link ad that supports this channel.
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