Touch Switch Control

Touch Switch Control

Touch_switch_control.gif (8781 bytes)

�� RL1. �� . �� RL1 �� Led D3. � �� +12V, �� IC1 �� 3.9V �� R5 �� zener D2. �� R1.

A simple circuit with which we have the possibility opening and closing the RL1 contacts. He becomes touching a small metal surface. Clue of situation that is found RL1, is become by the Led D3. The supply of circuit is +12V, the IC1 is supplied with 3.9V fall of voltage that is ensured by combination R5 and zener D2. For more good restoration perhaps it should adaptation of R1 value.

	Part List
R1=10M 1/4W 5% [See Text]	R6=1K 1/4W 5%	D2=3.9V 0.4W ZENER
R2-3=1M 1/4W 5%	C1-2=470nF 63V MKT	D3=LED RED
R4=33K 1/4W 5%	C3=47nF 63V MKT	Q1=BD679
R5=1.8K 1/2W 5%	C4=22uF 25V	IC1=4011
	D1=1N4148	RL1=12V Relay

Sam Electronic Circuits 9/04

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