00:02This video will describe a classic topic. An inverting operational amplifier combines
00:08It has several inputs and produces an output that is the sum of these inputs. The voltage signals
00:12The input signals are applied to the negative terminal of the inverter. The output signal will be the
00:18sum of the inverted and amplified input signals. Its functionality allows amplification
00:24signals. A summing amplifier circuit amplifies each of the input signals. The gain
00:31for each input is given by the RF feedback resistance ratio
00:35with the input resistance of the respective branch. Thus, to know the gain in any
00:41For the number of inputs N, the following equation is used. Therefore, the gain is just a quantity
00:52significant with respect to each individual signal. Since the gains are independent
00:58Adding them together doesn't produce a meaningful result. For example, three
01:05Audio signals activate a summing amplifier as shown in the figure below.
01:10What is the output voltage?
01:15The negative symbol in the gain indicates that the output signal of each branch has been
01:20inverted.
01:27Once the individual earnings for each entry have been calculated, they can be substituted.
01:32in the output voltage formula. The output voltage of the summing amplifier that we
01:37It gives the answer of minus 3.1. For the simulation, we need an input signal, it can be
01:45sinusoidal, or in this case the 555 integrated circuit as a square wave timer oscillator.
01:52For this we need a 5-volt DC power supply, two potentiometers of
01:58one kilo ohm, also two capacitors of one microfarad and 10.
02:47an LED.
03:00And we make the connection; to do this, it should be noted that the configuration must be followed.
03:05of the connections and other elements of the 555.
03:35Music
03:39Music
04:18For the amplification section we have an LF411CH amplifier, a 40 kOhm resistor, which is the feedback resistor, a
04:355-volt positive and negative DC power supply,
04:44We also made the connections for grounding or brazing.
05:18For the oscilloscope connection part, we need to connect the probe to ground.
05:30The yellow channel 1 is connected to the output of the 555 timer, to see if the original signal will be amplified.
05:43The blue channel 2 is connected to the output of the inverting amplifier.
05:50In the simulation, we observed the difference in the signals, both the original unamplified signal and the signal
05:57amplified,
05:57and we have an amplified gain of the feedback resistance over the input resistance,
06:03and it gives us -4 as a percentage, which will be 0.04 of the high pulse gain of the wave
06:08square.
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