Wednesday, February 2, 2011

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Simple Sine Wave Generator Based 2 Transistor

This Simple Sine Wave Generator circuit was designed to provide a valuable test equipment tool for sound reinforcement systems like guitar amplifiers and the like. Used in conjunction with an ac voltmeter or other ac measurement tools, it can be of considerable help in setting and controlling levels through any amplifying chain.
Simple Sine Wave Generator Using 2-Transistor BC550 Circuit

The Simple Sine Wave Generator circuit is based on a simple, two-transistor oscillator circuit, featuring very high frequency and amplitude stability but avoiding thermistors, bulbs or any special amplitude-limiting device. Three different output frequencies, namely: 300Hz, 1KHz and 3KHz, are provided by switching SW1.

The sine wave output amplitude can be varied continuously (by means of P1) in two ranges: 0 - 77.5mV RMS (219.7mV peak-to-peak) and 0 - 0.775V RMS (2.191V peak-to-peak).A regulated supply is necessary to obtain a stable output waveform. D1 and D2 force IC1 to deliver 6.2V output instead of the nominal 5V.

List Componet Of Sine Wave Generator Circuit
P1       : 4K7  Potentiometer
R1 : 12K
R2 : 2K2
R3,R5,R7 : 1K Trimmers
R4,R6 : 1K5
R8 : 1K
R9 : 4K7
R10 : 3K3
R11 : 2K7
R12 : 300R
R13 : 1K (Optional)
R14 : 100K
C1 : 22nF
C2 : 3µ3 Polyester
C3,C6 : 330nF
C4 : 56nF
C5 : 22µF/25V
D1,D2 : 1N4148
D3 : LED
Q1,Q2,Q3 : BC550C
IC1 : 78L05
SW1 : 1 pole 3 ways Rotary or Slider Switch
SW2 : 2 poles 3 ways Rotary or Slider Switch
B1 : 9V PP3 Battery

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