Touch Sensitive Toggle Switch Circuit

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About: Music: my profession for over 40 years... Electronics: my beloved hobby always.

Build this simple Touch Sensitive "toggle switch" with only 2 CMOS integrated circuits, CD4077 quad Xnor gate and CD4013 dual D-register. Circuit is very sensitive, and standby current ( led off ) is under 0.5 mA @ 6V supply.

Output can be easily modified to drive relays, power mosfets/transistors and triacs.

Supplies:

Step 1: Circuit at Work - Watch Video for Details & Waveforms.

Step 2: The Complete Circuit Diagram

Main components:

IC1: CD4077 quad CMOS Xnor gate

IC2: CD4013 dual D-register ( you will be using only one )

Q1: BC558 PNP transistor

Bat: 6 >20v 0.5mA @ 6v (led off)

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9: For More Details & Waveforms Watch Video

Step 10:

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    8 Discussions

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    jamesbrichmond

    2 years ago

    Awesome, thank you! I know this is old, so hopefully im not writing this into a black hole: would this work on 5vdc? Would the circuit's functions scale with the source as long as its within limits for the components themselves?

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    jamesbrichmondjamesbrichmond

    Reply 2 years ago

    Also, you say IC2 output toggles on a rising edge of the waveform. Does that mean that if, for example, you drastically slowed down the cycle by increasing capacitance on the astable multivibrator, that you'd have to touch the touch plate for a longer period of time to activate the switching function?

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    godfish

    4 years ago on Introduction

    I want to make this, I'll have to look into parts and prices. this would be great for a night light I have that the switch is going bad on.

    1 reply
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    simpletronicgodfish

    Reply 4 years ago on Introduction

    This circuit costs near to nothing to build. The most expensive part is the battery !

    Hey!... I like your earring !