Manual of inversor 74ls04

Figure 3. Simple self-excited multivibrator. Figure 4. Circuit of Crystal oscillator and frequency divider. Wireless microphones are available everywhere on the market, but their circuits are all made up of LC oscillators or quartz crystal oscillator circuits.

As we all know, the NAND gate has the function of magnification and phase inversion. Therefore, as long as three NAND gates are connected, a ring oscillator is formed.

Coupled with the FM circuit, it can also be made into a wireless microphone. Figure 5. FM wireless microphone. The author uses three of them to make an oscillator. When the supply voltage is 5V, the oscillation frequency is about 90mhz. When the power supply voltage decreases, the frequency decreases; when the supply voltage increases, the frequency also increases.

Of course, its oscillation amplitude will also change, but the effect is not significant. In this way, the author uses the method of changing the power supply voltage to change the frequency that is, to achieve frequency modulation. The specific method is to use the output of BA, an audio amplifier integrated circuit, as its power supply.

BA is an amplifying circuit of recording head. When it is used for tape signal compensation and equalization, an RC series parallel network should be connected between the first and the second pins, but it is used for linear amplification, so only a kwkw resistor is needed.

The voltage of the output terminal pin of BA should be equal to one-half of the voltage of the pin power supply. If the power supply voltage is 12V, there should be a 6V output. If it is not correct, the resistance should be adjusted.

In addition, the 1kW resistor in the figure is used to adjust the magnification. If it is reduced, the gain will be increased.

When speaking to an electret microphone, the voltage at the output PIN can change rapidly from 5. This voltage is sent to the foot of 74LS04 to make it generate FM signal, which is amplified and isolated by the fourth NAND gate and sent to the antenna. The series are digital logic integrated circuits.

These NOT gates perform Inverting function. Inverter in logic converters is an electronics device whose basic functions are to invert the incoming logic weather it is HIGH or LOW.

They are also known as NOT gates. A hex inverter is a type of an integrated circuit that contains six inverters. Many sophisticated digital devices use inverters, including multiplexers, decoders, and state machines. The inverter IC comes up in multiple packages, which make its usage in multiple devices. The IC is cheaper and smaller in size. NOT gate is designed by transistors and resistors. The transistor act as a switch and resistor use to change the max current flow.

The transistor will be attached to the power supply and resistor. The base of the transistor will act as input and emitter will act as output. Here is the circuit. There will be two conditions in which the circuit will operate. Lowering of Voltages will give the LOW state. On the other hand, when we will give the input LOW on the transistor then the transistor will not work.

This will allow the power supply to give the full voltages on the output pin. No matter how the inverter is designed. It will always give the output according to the following pattern. The input will always follow the following truth table on different inputs.

The combination of NOT gates cannot make any other gate but a single NOT gate can make other gates by combining with it. Choose the appropriate package depending on requirement.

The description for each pin is given below. Note: Complete technical information can be found in the 74LS04 Datasheet linked at the bottom of this page. The chip is basically used where a logic inverter is needed.

Inverter Gates in this chip provide output which is negated logic input. The chip has six gates which do NOT operation. When you want TTL outputs. The gates in this chip provide TTL logic outputs which are a must in some applications.

The internal connection of gates can be given as below. As shown in diagram, we have a transistor forming a NOT gate. Input here is 1A which is connected to button.