Wednesday, February 2, 2011
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.
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| 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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