Automatic light control lighting circuit 4

(4) The fourth circuit of the automatic light-controlled lighting circuit is shown in Figure 2-89. It uses photovoltaic cell BP as the detection element. The parameters of two SVR837 photovoltaic cells in series are: photocurrent ≥lOllA, leakage resistance ≥lOOkn, open circuit output voltage ≥1. OV, the spectral response range is o. 4～ 1.1Hm, response speed ≤50ys.     When there is light, adjust the potentiometer RP (increase the resistance) to make the lamp EL light up.