Delayed lights-out switch circuit (3)

A tuo can better delay
the lights-out switch circuit , close the switch S,
the light E lights up, and the electronic circuit on the right side does not work
. After S is disconnected, the 220V AC power passes through the rectifier
bridge V D1 ~ VD-1 and vr)o, R. Charging
G, the subsequent process is exactly
the same as the E example. Therefore, the thyristor VT can be kept on for a short
time, so the lamp E will not go out immediately, but will turn off after a delay. The difference from Example 21 is that
during the delay time, the lamp E in Example 1 is powered by half voltage , and the light will flicker. However, during the delay period in Example 1
, the lamp E is also powered by full voltage , so there will be no flickering. Phenomenon.