超低失真正弦波发生器电路

贴个简单的超低失真正弦波发生器电路 贴个简单的超低失真正弦波发生器电路

Generates very low-distortion sine waves up to 1V RMS No thermistors required - No settling time Parts:

P1_____________10K Log. Potentiometer (Dual-ganged) P2______________2K2 Linear Potentiometer

R1,R2,R4,R5_____3K3 1/4W Resistors R3,R6_________820R 1/4W Resistors

R7_____________10K 1/2W Trimmer Cermet R8_____________22K 1/4W Resistor R9_____________Photo resistor (any type) R10_____________8K2 1/4W Resistor R11,R12,R14,R15_3K3 1/4W Resistors R13_____________2K7 1/4W Resistor R16--R20________3K3 1/4W Resistors R21____________56K 1/4W Resistor R22____________68K 1/4W Resistor R23_____________1K 1/4W Resistor

C1,C6_________220pF 63V Polystyrene Capacitors C2,C7___________8n2 63V Polyester Capacitors C3,C8__________82nF 63V Polyester Capacitors C4,C9_________150nF 63V Polyester Capacitors C5,C10________680nF 63V Polyester Capacitors

D1--D4______1N4148 75V 150mA Diodes D5_____________LED 5mm. Red

IC1,IC2_____NE5532 Low noise Dual Op-amps IC3__________TL084 Quad BIFET Op-Amp

SW1__________2 poles 3 ways rotary switch

Comments:

Producing low-distortion sine waves, this oscillator operates over the range 16 to 22000 Hz. The circuit is based on two articles that have appeared earlier in Wireless World - Roger Rosens' "hase -Shifting Oscillator", February 1982 pp. 38-41, and J. L. Linsley Hood's "Wien-Bridge Oscillator with low harmonic distortion" from May 1981 pp. 51-53.

This design features the simplicity of the Rosens' circuit but avoids the use of a thermistor. Instead, oscillator stability is controlled by means of a common photo-resistor driven by a LED, as suggested in the Linsley Hood article.

There is no settling time when the oscillator's frequency is changed and no bouncing of the output

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