Double button light switch circuit (5)

It is a touch-type lamp made of NE555 time base circuit
, but it uses thi transistor as the switching element, so the power consumption is small.
    The transistor VD2~VD:J and
the thyristor VT constitute the lU lamp E In
the main circuit, the NE500 cyanosis thyristor
is controlled in the same circuit, and its power supply is provided by
R. Step-down, V D1 rectification , vs
steady win 1_(,, filter supply.
When the light is off, just touch F to "turn on"
the electronic chip Ml, and the miscellaneous
signals of the human body's organs will be rectified by VD6 to obtain a negative
voltage. The trigger terminal ② of NE5 5 5
sets the base deletion circuit, and the ③ pin inputs H1 high level, which is sent to the rJ input of VT via R: to
quickly turn on YT, and lU lamp F is powered on and glows. When the light is turned off , touch the "curse" electrode sheet M2 with your hand, and the miscellaneous signal induced by the human body is rectified
by VD7 to obtain a positive voltage. The ⑥ pin time base circuit of the Kuai Xin terminal of /JIl~NEoo:) is busy and the ③ pin outputs a low-voltage thyristor. VT loses gate trigger current. When the alternating current crosses zero, it cuts off and the electricity goes out.