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Photographic Oscillator Circuit

2016-08-19 19:06  
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The oscillator by 555、R1、R3、C1 and Light activated triode VT constitutes,internal impedance of Light activated triode VT With the  light changes, When in a strong light, show the low resistance, With weak light, a high resistance. Therefore, oscillation frequency also along with the intensity of illumination and change, the frequency range up to 1 Hz ~ 6.5 kHz. This can be used as the blind oscillator units, then that the morning light and so on.

Photographic Oscillator Circuit