Telephone control automatic lighting circuit 1

The diagram shows telephone control automatic lighting circuit. At night, when telephone rings or master takes up telephone transmitter dialing, the light can lighten; when telephone ringer stopped (no one listen) or on-hook, it can delay 10~40s, then the light can die out itself. Moreover, this circuit also set a light triggering button. The ligh

t can lighten about 40s only by pressing the button.

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