1 KHz Sine Wave Generator Circuit

This is a design circuit for generates a good 1 KHz sine wave adopting the inverted Wien bridge configuration (C1-R3 & C2-R4). It features a variable output, low distortion and low output impedance in order to obtain good overload capability. The figure is shown in below. The bulb must be a low current type (12V 40-50mA or 6V 50mA) in order to obt

ain 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 mili voltmeter connected to the output with R7 rotated fully clockwise, or to view a sine wave 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 10 KHz but R5 requires adjustment. High gain transistors are preferred for better performance.

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