Showing posts with label generator. Show all posts
Showing posts with label generator. Show all posts

Thursday, November 20, 2014

High Frequency Waveform Generator Circuit Diagram

HighHigh Frequency Waveform Generator Circuit Diagram

High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function.
The core of this waveform generator is MAX038. This integrated circuit chip gives complete function to build a waveform generator/function generator.

  • The circuit can be used to generate square wave, triangle, or sine wave by programming the pin inputs (A0:pin 3, A1:pin 4).
    • A0 A1 WAVEFORM
    • X 1 Sine wave
    • 0 0 Square wave
    • 1 0 Triangle wave
  • The frequency can be controlled using current. If we disconnect the 20k RIN from REF (pin 1) and connect it to a DAC, then we can control the frequency using microcontroller or digital interface. We can even control the chip using a quartz crystal (PLL) by controlling the current using a phase comparator output that compares the sync output (pin 14 of MAX038) and a reference clock from quartz crystal oscillator.

This waveform generator integrated circuit chip is very interesting since it can generate 0.1Hz to 20MHz, very wide operating frequency, as expected for every waveform generator instruments.

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Wednesday, September 24, 2014

Simple 1KHz Sine wave Generator Circuits Diagram

This simple circuit generates a good 1KHz sine wave adopting the inverted Wain bridge configuration (C1-R3 & C2-R4). It features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament bulb ensures a stable long term output amplitude waveform. 

1KHz Sine wave Generator Circuits Diagram

 Notes:
  • The bulb must be a low current type (12V 40-50mA or 6V 50mA) in order to obtain good long term stability and low distortion.
  • Distortion @ 1V RMS output is 0.15% using a 12V 40mA bulb, raising to 0.5% with a 12V 100mA one.
  • Using a bulb differing from specifications may require a change of R6 value to 220 or 150 Ohms to ensure proper circuits oscillation.
  • Set R5 to read 1V RMS on an Audio Millivoltmeter connected to the output with R7 rotated fully clockwise, or to view a sinewave of 2.828V Peak-to-Peak amplitude on the oscilloscope.
  • With C1, C2 = 100nF the frequency generated is 100Hz and with C1, C2 = 1nF frequency is 10KHz but R5 requires adjustment.
  • High gain transistors are preferred for better performance.

Parts:

R1____________5K6  1/4W Resistor
R2____________1K8  1/4W Resistor
R3,R4________15K   1/4W Resistors
R5__________500R   1/2W Trimmer Cermet
R6__________330R   1/4W Resistor
R7__________470R   Linear Potentiometer
 
C1,C2________10nF  63V Polyester Capacitors
C3__________100µF  25V Electrolytic Capacitor
C4__________470nF  63V Polyester Capacitor
 
Q1,Q2_______BC238  25V 100mA NPN Transistors
 
LP1___________12V  40mA Filament Lamp Bulb (See Notes)
 
J1__________Phono chassis Socket
 
SW1__________SPST  Slider Switch
 
B1_____________9V  PP3
 
Clip for 9V PP3 Battery

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Friday, April 12, 2013

Long Interval Pulse Generator

A rectangular-wave pulse generator with an especially long period may additionally be constructed the usage of most effective two parts: a National Semiconductor LM3710 supervisor IC and a 100-nF capacitor to do away with noise spikes. This circuit utilises the watchdog and reset timers within the LM3710. The watchdog timer is reset when an facet seems on the WDI enter (pin 4). If WDI is constantly held at floor degree, there are usually not any areas and the watchdog times out. After an interval TB, it triggers a reset pulse with a length TA and is reloaded with its initial price. The cycle then begins all over once more. As a result, pulses with a period of TA + TB are existing on the RESET output (pin 10).

Circuit diagram:
\"long-interval-pulse-generator-circuit-diagram\" Long-Interval Pulse Generator Circuit Diagram

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As may additionally be viewed from the table, periods ranging as a lot as around 30 2ds may additionally be done on this manner. The two intervals TA and TB are determined by internal timers in the IC, which is available in quite quite a bit of models with 4 completely different varys for every timer. To obtain the specified interval, it's vital to order the fitting version of the LM3710. The type designation is decoded in the accompanying desk. 

The reset threshold voltage is beside the point for this explicit utility of the LM3710. The versions shown in daring face had been to be had on the time of printing. Current information can be found on the manufacturer’s house page (www.national.com). The numbers in brackets point out the minimal and maximum worths of intervals TA and TB for which the LM3710 is tested. The circuit functions with a provide voltage within the vary of 3–5 V.



Author: Gregor Kleine Copyright: Elektor Electronics
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Friday, April 5, 2013

Tri Waveform Generator

The Tri-Waveform Generator can be used for a number of different uses. The one that I use it for is a signal generator to test circuits. The frequency range is 20 to 20khz. and can be adjusted by R1. The duty cycle or the time that the waveform is high and the time that the waveform is low can be adjusted by R4. The purpose of R2 and R3 are to clean up any distortion on the sine wave output. To do this you must hook up the sine wave output to and oscilloscope and adjust R2 & R3 to make the sine wave as accurate as possible.


Source by : Streampowers
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