Circuit Project Electronic

Here is a simple touch control switch, I use IC 4011.
Logic HI at output is timer pulse delay control by C1
1S = C1 4.7uF(micro farad),
After touching the plate connected,so well pulse output.
Detail more, Please read in this image circuit.

CD4538 is a dual Monostable Multivibrator. The pdf data sheet is here.
When you trigger the chip the output sends off one single pulse or one high-low event, like the pulse below.
The T+ pin 4 of U1a is the positive edge trigger or raising edge trigger input, the T- pin 5 is falling edge or [...]

This is circuit Digital One-Shot,
use IC TTL Digital 74LS02 : QUAD 2-INPUT NOR GATE .
Time Output = 0.8xRxC
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