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Simple Crystal Oscillator Test Circuit

2016-08-07 19:38  
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Simple Crystal Oscillator Test Circuit
Here is an introduction of a simple crystal oscillation test machine, whose schematic circuit is as shown in the figure attached. In the figure, V1 and its peripheral components (including the crystal oscillator to be tested) compose a capacitance connecting three point type oscillator. When the two ends of probe X1 X2 are connected with the crystal oscillator to be tested, the circuit will start oscillation. Oscillation signal will be output after being amplified by the emitter follower V2. Then it will provide bias current to V3 after being coupled by C4 and voltage-multiplied and rectificated by D1, D2. So V3 will break over and LED will flicker. If the crystal oscillation doesn`t work well or disconnects, the circuit will not start oscillation and LED will not flicker.