Sunday, September 7, 2014
Simple 1KHz Sine wave Generator Circuits Wiring diagram
This simple schema 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 diagram 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____________5K61/4W Resistor
R2____________1K81/4W Resistor
R3,R4________15K1/4W Resistors
R5__________500R1/2W Trimmer CermetR6__________330R1/4W Resistor
R7__________470RLinear Potentiometer
C1,C2________10nF63V Polyester Capacitors
C3__________100µF25V Electrolytic Capacitor
C4__________470nF63V Polyester Capacitor
Q1,Q2_______BC23825V 100mA NPN TransistorsLP1___________12V40mA Filament Lamp Bulb (See Notes)
J1__________Phono chassis Socket
SW1__________SPSTSlider Switch
B1_____________9VPP3
Clip for 9V PP3 Battery
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