Showing posts with label sine. Show all posts
Showing posts with label sine. Show all posts
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
Friday, August 29, 2014
Oscillator Sine wave Wiring diagram Schematic
This schema is a sine wave oscillator which uses operational amplifiers working in oscillation back (positive feedback), or the oscillation output to the input. This oscillator is called Wien bridge schema is often used. The oscillator Sine wave oscillator is difficult to be done due to the distortion of the oscillation signal, different oscillator square wave, triangle wave oscillator (sawtooth).
Oscillator Sine wave Circuit Diagram
In the case of C1 = C2 = C, R = R1 = R2, giving the frequency of oscillation and can be calculated using the following formula.
Formula Sine Wave Oscillator
The example of the schema was made this time is shown below.
f = 1 / (2 x 3.14 x 10 -6 0.01 x 10 x 15 x 3)
f = 1 / (0.942 x 10 -3)
f = 1.062 x 10 3
f = 1062 Hz
The actual frequency of the schema was 900 Hz.
f = 1062 Hz
The actual frequency of the schema was 900 Hz.
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