Electronic projects




you are here: home page :: projects :: Timers & oscillators :: oscillators :: 1KHz Sinewave Generator

1KHz Sinewave Generator

Simple circuitry, low distortion, battery operated
Variable, low impedance output up to 1V RMS

Circuit diagram

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 100F 25V Electrolytic Capacitor
C4 470nF 63V Polyester Capacitor
Q1,Q2 BC238 25V 100mA NPN Transistors
LP1 12V 40mA Lamp (See Notes)
J1 Phono chassis Socket
SW1 SPST Slider Switch
B1 9V PP3
Clip for 9V PP3 Battery

Circuit description:
This circuit generates a good 1KHz sinewave using the inverted Wien bridge configuration (C1-R3 & C2-R4). Features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament lamp ensures a stable long term output amplitude waveform. Useful to test the Audio Millivoltmeter, Audio Power Meter and other audio circuits published in this site.

Notes:
The lamp 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% with a 12V 40mA lamp, raising to 0.5% with a 12V 100mA one.
Using a lamp differing from specifications may require a change in R6 value to 220 or 150 Ohms to ensure proper circuit's oscillation.
Set R5 to read 1V RMS on an Audio Millivoltmeter connected to the output with R7 fully clockwise, or to view a sinewave of 2.828V Peak-to-Peak on the oscilloscope.
With C1,C2 = 100nF the frequency generated is 100Hz and with C1,C2 = 1nF frequency is 10KHz but R5 is needing adjustment.
High gain transistors preferred for better performance.

author: RED Free Circuit Designs
e-mail:
web site: http://www.redcircuits.com
project categories:
folder Audio (49)
folder Power & high voltage (43)
folder Radio (23)
folder Light & LED (31)
folder Tools & measurement (40)
folder Telephone (18)
folder Automotive (10)
folder Microcontrollers (12)
folder Sensors & control (47)
folder Timers & oscillators (40)
folder Miscellaneous (26)

StumbleUpon button

Share this page
Bookmark and Share
project subcategories:
All subcategories
timer circuits
oscillators

similar projects:
Adjustable High/Low Frequency Sine wave generator
Electronic Canary
Electronic Siren
Function Generator
Insect Repellant
Low-distortion Audio-range Oscillator
Mini Metronome
Precision Metronome and Pitch generator
Reverse Bias Oscillator
Self-powered Sine to Square wave Converter

recently added projects:
Doorbell for the Deaf
High Quality Intercom
Combinational Conjuring Trick
POT-PLANT POWER
Ultrasonic Dog Whistle
Quiz Circuit
LED Torch
Insect Repellant
Speaker Microphone Circuit
Magic Wand Conjuring Trick.

most popular projects:
Led display digital Voltmeter
500W low cost 12V to 220V inverter
Low pass filter - Subwoofer
Metal Detector
Basic UPS Power Supply
2N3055 Power Amplifier
High And Low Voltage Cut Off With Time Delay
200W audio amplifier
LED Torch
100W RMS Amplifier


DIY Electronics Projects

Promote Your Page Too