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Single-junction transistor sine wave oscillator

2016-05-07 21:42  
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Single-junction transistor sine wave oscillator
The single-junction transistor is often used in sawtooth generator and pulse generator, but it may also constitute a simple sine wave generator circuit. As an scillator circuit with discrete components, it uses few components. Circuit is shown as the chart. And comparing with ordinary unijunction relaxation oscillator circuit, it adds a LC tuned circuit to the second base, the tuned circuit generates sinusoidal oscillation depended on the driving of unijunction excitation current pulse. Adjusting resistor Rl can control the size of the current pulse, sine wave can be obtained at B2. According to the parameters of figure, the oscillation frequency is 3750Hz, the peak value of output voltage peak is 2V.