Double button light switch circuit (4)

A two-button touch light switch made with NF,~55 time base circuit . The 2ZOV alternating current passes through
[1-, C:, VDI, vs to form a simple
voltage-reducing half-voltage voltage stabilizing
circuit. After passing through C, a
DC
voltage for the time base tU circuit. Use electricity. When you need to turn on
the light, you just need to touch
the "縸" electrode piece Ml with your hand. After the
clutter signal induced by the human body is rectified by VD2 , a negative signal
is input to the trigger terminal pin ② of the time base circuit
, which sets the time base circuit to
pin ③. The output is high level, the relay
K suction stage and its moving stage contact kl are closed, and the electric light E is energized and emits light. When you need to turn off the light, just touch
the "Beautiful" electrode piece M2 with your hand. The human blood-sensing clutter signal is rectified by VD3, and a signal
is input to the threshold terminal ⑥ pin of the time base circuit , and the time base circuit is immediately reset. , the output terminal ③ pin inputs 30 low level, the relay K is released, and the electric power E is turned off.     (1. It is required to use polyethylene capacitors with a resistance of R to 400V and E, R,, R. It is necessary to use high- quality resistors with good quality, such as film resistors. K can use JZC-22F, DC12V small and medium power Electromagnetic relays and other components have special lC requirements. When the circuit is connected to the AC mains, the position of the phase and neutral lines must be as shown in the figure pjf, otherwise the circuit will not work reliably and normally.