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| schematic diagram |
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| 555 IC pinout |
R1 - 5.6 Mega ohms 1/4W
R2 - 47 kilo ohms 1/4W
R3 - 1 kilo ohms 1/4W
C1 - 22uF electrolytic capacitor rated 16V
LED - red or any LED (see led info to know more)
BUZZER - any 5v to 12v buzzer
555 IC - LM555 or any timer IC
Other versions:
Simple Touch alarm
Touch switch using Transistor
Touch Alarm ver 1.1.0
Touch switch (ON and OFF separated)
can i use 1/2 w resistor for 1k instead of 1/4 w
ReplyDeleteYes you can use resistor of higher capacity.
ReplyDelete