Frequency Adjustable Pulse Generator NE555 Module
Frequency Adjustable Pulse Generator NE555 Module - The 555 timer IC is an integrated circuit that is popular used in a variety of timer, pulse generation, and oscillator applications. This NE555 frequency adjustable pulse generator Module utilizes the NE555 timer IC to generate pulses from about 4Hz to 1.3Khz, which can be used for experimental development, or driving a stepper motor, it would be also a good choice for users learning& experiencing the analog RC circuits.
Types of Frequency Generators
Frequency generators come in a variety of forms with a range of uses. In general, no instrument can be used for every feasible application.
Audio Frequency Generator
One type of frequency generator, an activated signal generator, is the audio frequency generator. A modulated audio frequency signal emerges from the circuit's output whenever a positive pulse is applied to the input. This circuit's signal pattern is similar to a bird's chirp. The activation signal's pulse width must be one millisecond. The voltage supply ranges from 9 to 20 volts. The audio frequency generator uses no more than 2mA of current. The C1 capacitor can be changed to a 0.1UF capacitor to convert this circuit into a Morse code signal generator.
Digital Frequency Generator
The digital components of a digital frequency generator include an adder, a shift register, a 1M bit EPROM, and a latch. The shift register reduces the number of port pins required from 33 to 3 at the microcontroller unit. Additionally, it synchronizes the adder action with the data supplied from the microcontroller unit.
Through the latch, the adder's output is connected to itself as feedback. As a result, at each CLK cycle, the output value of the latch is enhanced by the value of the shift register. Additionally, the register's value serves as an EPROM address. This EPROM includes a table that allows the value of the latch and the amplitude of the o/p signal to be changed. Every waveform is theoretically capable of being stored and then generated.
The precision of the oscillator determines the precision of the frequency produced at low frequencies, while the jitter—caused by the independent nature of the adder and table—determines the precision of the frequency produced at high frequencies. The MCU's DDS software serves as the foundation for amplitude modulation and frequency modulation. Because the sinus is read from a 16K byte data structure starting at H01000 (Least Significant Bit first), you can replace it with any other type of waveform.
Features of the Digital Frequency Generator
- Some of the essential traits of the digital frequency generator are the ones listed below.
- A 16-bit digital to analog converter can produce a signal that is clear up to 2 Megahertz with four times as much sampling at 2.5 Megahertz and a 32-bit adder running at 16 Megahertz.
Frequency Modulation and Amplitude Modulation:
Microcontroller software DDS Modulation with sine, triangle, and sawtooth waveforms combined with 24-bit adder results in 0.0003 Hz steps for frequency modulation at 5.3 kHz and 0.0005 Hz steps for AM at 8.9 kHz.
- 12-bit amplitude modulation and 16-bit frequency modulation during modulation
- 4th order Butterworth filter for the AM signal operating at 2 kHz
- From 0 to +/-12V can be adjusted as the output voltage
- From 0 to +/-8V, the output offset can be changed.
- This frequency generator may run on its own.
- RS232-based remote control
There are 4 jumpers and 2 variable resistors on the module, users can adjust the output wave with these components, to get their ideal wave easily.
- Output with the LED indicator
- The output frequency is adjustable:T=0.7(RA+2RB)*C RA and RB can be adjusted (0-10k); Low frequency:C=0.001UF; Intermediate frequency:C=0.01UF; High-frequency:C=1UF; higher frequency:C=100UF
- Input Voltage: 5V-15VDC.(when power supply is 5V , the output current can be 15mA around;when 12V power supply, the output current can 35mA around)
- Output amplitude: 4.2V V-PP(5v input) to 11.4V V-PP(12V input). (Different input voltage, the output amplitude will be different)
- Maximum output current: >=15mA (5V power supply, V-PP greater than50%),>=35mA (12V power supply, V-PP greater than 50%)
- As a square wave signal generator,generates a square wave signal used for experimental development
- Used to drive a stepper motor
- Generate adjustable pulse for MCU
- Generate adjustable pulse to control circuitry associated