The lighting early warning device circuit

Published:2011/7/4 21:18:00 Author:Borg | Keyword: lighting, early warning device | From:SeekIC

Working principle The working principle is shown in figure 1, the feature of the circuit is that it can be adjusted to the self-oscillating state. The bias resistor in the figure can acquire the best relaxation feature. The oscillator is DC coupled, and the feedback branch is the collecting electrode of TR1 and the basic pole of TR2. The total gain of the circuit is set by the multi-turn (11,18 and 20) preset potentiometer VR1.The capacitor C3 sets the solid LEV of the TR2 emitting pole, and the capacitor C2 on VR1 smooth contactor is increasing the phase movement when it is oscillating.



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