Double button light switch circuit (6)

This is a uniquely designed hot-key touch switch. The dotted line at the top is an ordinary light circuit
and the top is a light switch. It has two leads iJ I 1 terminals for the external instrument, so it can easily replace the ordinary mechanical switch
. There is no need to change the original indoor wiring. This connection method is called the "two-wire" connection method.
    VI)I-VD4 constitutes
the bridge rectifier circuit, VT
and vs constitute the main
circuit of the light switch. When VI is on,
the light is on; when VT pod is off,
the light is on. When VT is in
off state. The 220V AC
power is rectified by VDl - VD4 and
consists of R., vs and f
to form a voltage stabilizing circuit, C. Both ends can be pressed to obtain a DC voltage of about 6V, which can be used to power the NF5 5 5 time base circuit . When VT
is in the conducting state, the alternating current is rectified by V Dl- VD4, and VT and vS form a loop, c. The terminal
can still maintain a DC output of about 6V. Therefore, the DC operating voltage of NE555 will not
drop due to the conduction of VT.
    The operation mode of NEi)55 time base circuit is similar to the previous state. When the light is turned on, people touch the F}U pole piece Ml, and
the noise induced by the human body The wave signal is injected into the ② pin of the trigger terminal through R1 , and the VD5 help flow is deduced so that the ② pin obtains the cylinder pulse
trigger signal. The time base circuit is set, and the ③ pin outputs high level. At this time, VT obtains the trigger current m from R. When it is turned on,
the lamp F is powered on and emits light. When you need to turn off the light, just touch the electrode sheet M2 with your hand. At this time, the clutter
signal induced by AW is injected through R and rectified by Vr)6, so that the value terminal of the time base circuit is The ⑥ pin obtains the k/pulse touch signal, and
the time base circuit resets. The ③ pin outputs a low voltage R. The forward trigger voltage provided by R is R, and the ③ pin of the time base circuit
is short-circuited to the ground, and VT loses the trigger voltage. When the alternating current crosses zero, it will cut off and the light F will go out.
    VT can use 2N (i5 6S, 1/ICR100 8 type small ear-sealed one-way tube. VS should use
a 6V voltage regulator tube with a power dissipation of not less than 1W. , such as UZP-t3. 2}3 type, etc. The load capacity of this circuit is
restricted by the voltage regulator tube, so the power of the spider E should be greater than 40W.