Circuit Project Electronic

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

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

Circuit description:
This circuit generates a good 1KHz sinewave 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. A small filament bulb ensures a stable long term output amplitude waveform. Useful to test the Precision Audio Millivoltmeter, Three-Level Audio Power Indicator and other audio circuits posted to this website.

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Source : http://www.redcircuits.com/Page13.htm