Using C-MOS light emitting diode drive circuit NAND gate pulse

Description: The 4000 Series 4011B is a NAND gate used in conjunction with a 4AI NAND gate circuit group to create two loops of an unstable multivibrator. The first NAND gate and the second NAND gate operate at approximately 1 kHz, as determined by the specific requirements for a large duty cycle oscillator circuit. A diode is connected in series, producing short pulses with a period T. The configuration involves NAND gates 3 and 4 to achieve an oscillation frequency of approximately 38 kHz. This oscillator is designed for use in a remote control receiver circuit. If a capacitor of 2000 pF is used, along with a resistor of 11.96 kΩ, a variable resistor of 5 kΩ can be incorporated in series to adjust the oscillation frequency around 38 kHz. The current through the LED is influenced by the value of the resistor, which is determined by the LED's rating.

The 4000 Series 4011B NAND gate can be utilized effectively in a variety of digital circuits due to its versatility. In this specific application, it serves as the core component of a multivibrator circuit, which is essential for generating square wave signals. The unstable multivibrator operates by creating an oscillation between two states, which is achieved through feedback loops formed by the NAND gates.

The first two NAND gates generate a square wave with a frequency of 1 kHz, which is suitable for applications requiring a large duty cycle. The diode in the circuit assists in shaping the output pulses, ensuring that they are of short duration, thereby creating a precise timing characteristic necessary for the operation of the multivibrator.

The configuration of NAND gates 3 and 4, which operates at a frequency of approximately 38 kHz, is particularly useful for remote control applications. This frequency can be tuned using the variable resistor, allowing for flexibility in design and ensuring compatibility with various receiver circuits. The capacitor value of 2000 pF plays a crucial role in determining the timing intervals of the oscillation, while the resistor values, including the fixed and variable resistors, provide a means of adjusting the frequency to meet specific requirements.

The LED current is another critical aspect of this circuit, as it must be managed to prevent damage to the LED. The resistor value is selected based on the LED's specifications, ensuring that the current remains within safe operating limits. This careful consideration of component values and configurations results in a reliable and efficient oscillator circuit suitable for remote control applications and other digital systems.4000 Series 4011B is (NAND gate) by the 4AI NAND gate circuit group to form two loops unstable multivibrator. L NAND gate and NAND gate 2 is ikHz (determined in accordance with requirements) large duty cycle oscillator circuit. By a diode with -D, series chu. Short pulses with a period T is T:. +. : I.ic, (chu a chu 2). NAND gate NAND gate 3 and 4 oscillator configuration, the oscillation frequency,: 38kHz, the oscillator is intended to use the remote control receiver circuit added, if c, 2iOOOpF, WUR: 1/2.2caj 11.96kQ, resistance can ffliokQln with 5kO dish series variable resistor V, the oscillation frequency by the VR transferred 38kHL. Ran t quite used to determine the LED current, W1 value is determined by LEDRij rating.