Touch switch

Following circuit used for turn ON-OFF the electronic devices by touch
IC 555 can give 200mA as maximum current in output so if you want to run loads with more current you have to using a power transistor or a relay as switch.
By using relay you can switching 110-220v electric devices up to 10A.
You can run this circuit by 3 to 18v according to load voltage.
limitation of this circuit : it does not operate with mitten
You can find other touch switch circuits in following link:
https://engmousaalkaabi.blogspot.com/search/label/Touch%20switch

Parts list:
IC555
Resistor 1M
Battery

Note:
IC555 will burnt if you connect the battery incorrect, so pay attention to battery polarity.

Touch switch



 

Postingan populer dari blog ini

Using ultrasonic sensor without arduino

Gambar
Using ultrasonic sensor without arduino Parts list: IC 555 IC KA2284 LED(5pcs) Ultrasonic receiver & transmitter Resistor 1K Resistor 2.2K Resistor 10K Resistor 100 ohm Potentiometer 10K (2pcs) Capacitor 10uF (4pcs) Capacitor 3.3nF Transistor 2N2222 Buzzer There are 2 ways to using Ultrasonic sensor without microcontroller: First way, the buzzer turns ON when you put your hand near the sensor   Second way the LED bar show you the distance level between the sensor and the objects. Video: More information in the video
Baca selengkapnya

Power saving relay driver

Gambar
Relay coil after switch ON needs to voltage much lower than its nominal voltage,  We can use this property of relay to saving 85% of the power to increase the battery life in battery powered circuits. To reduce the current / power consumption we can put a resistor through the relay coil, but since this low current not enough to running the relay at the beginning so we should short out the resistor for 1 second, then the relay switch keep going.  You have to use this formula to calculate the suitable resistor value: For more explanations please watch this video:   
Baca selengkapnya

Electronic load using Op-Amp IC 358

Gambar
Electronic load using Op-Amp IC 358 In this circuit i using IC 358 and some few components to make a simple constant load.  The trick here is connecting a dc voltmeter to the non-inverting input of the op-amp to preset the current before connect it to the battery or the super cap. under test. For more explanation you can watch the video below. Parts list: LM358 : https://www.banggood.com/custlink/Dvv3hO51Df High power resistor: https://www.banggood.com/custlink/K3GvYjHwRm Digital DC Voltmeter: https://www.banggood.com/custlink/3vmDYL5TDU Copper board: https://www.banggood.com/custlink/3KDDmMsPSc MOSFET IRFZ44N : https://goo.gl/35n5Tb   Potentiometer 100K : https://goo.gl/dKnWCj Resistor kit (10 Ohm): https://goo.gl/TgSaff Heatsink: https://www.banggood.com/custlink/D3KGdOSmzf   Circuit:   Gerber file: Download the Gerber file from here:  https://drive.google.com/open?id=1Lx8xjfkyYPvvzAbA0ponFBYBTQDqrMvU Video: For more explanation you can watch the video below 
Baca selengkapnya