Unbelievable, only 3 yuan can DIY touch switch circuit

We have created a touch switch using the NPN transistor. However, only one function can turn on the circuit without turning off the circuit without disconnecting the power. In this circuit, we will build a touch switch with an ON and OFF function. We will use an N-channel MOSFET transistor called IRFZ44 in this circuit. You can see the pin arrangement and physical appearance of the IRFZ44 transistor in the figure below. Key parts We will need the following components to build this circuit. 68Ω resistor IRFZ44 MOSFET led Circuit line Required tools: iron Iron frame Flux Pitch Circuit diagram There are only three components in the circuit. We can use copper plates as touchpads. There should be a few millimeters between these mats. Step guidelines: Step 1: Arrange components Step 2: Welding 68Ω resistors to the drain pin of IRFZ44 MOSFET. Step 3: Connect the LED and the power connector as shown in the circuit diagram. Step 4: The circuit is ready, you can connect the battery and test the circuit. How is this circuit work? When someone touches on PAD, the small current will flow through the person's body, reach the gate of the IRFZ44 transistor, thereby generating a small voltage difference with the ground. This will trigger the transistor and cause the LED to light. When the "closed" pad is in contact, the gate of the IRFZ44 will be grounded, thereby turning the transistor to close the LED. in conclusion The circuit can be used to touch various items controlled by the touch switch, such as tower lamps, lighting systems, etc., is not very interesting, join us, share knowledge, and hardware change the world. Be Be Article Source HackADAY

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