IR Remote Switch Circuit

This circuit lets you control any line powered electrical device (a lamp, television, fan, etc.) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With this circuit, you can put them back into use. The circuit looks for any modulated IR source and uses it to control a TRIAC, which then switches any appliance connected to it's socket. For example, you can use it to control the room lighting in your home theater setup using any of the remotes you already have. The circuit is powered using a simple transformer less power supply from the line itself, making it compact and easily built into a light switch, wall box, power bar or even the appliance you wish to control. Schematic

Part	Total Qty.	Description
R1	1	3 Meg 1/4W Resistor
R2	1	1.2 Meg 1/4W Resistor
R3	1	680 Ohm 1/4W Resistor
R4	1	2K 1/4W Resistor
R5	1	4.7K 1/4W Resistor
R6	1	150 Ohm 1/4W Resistor
C1	1	0.001uF Ceramic Disc Capacitor
C2, C5	2	1uF 50V Tantalum Electrolytic Capacitor
C3	1	47uF 50V Tantalum Electrolytic Capacitor
C4	1	10uF 50V Tantalum Electrolytic Capacitor
C5	1	150 Ohm 1/4W Resistor
D1	1	1N4733 5V Zener Diode
D2	1	1N4003 Rectifier Diode
Q1	1	2N6071A TRIAC
U1	1	GP1U52X IR Module
U2	1	MC74HC74 D-Type Flip Flop
U3	1	MOC3011 Opto Isolator
MISC	1	Board, Sockets For ICs, Mains Socket, Mains Plug and Cord, Wire

 

1. Under normal circumstances, Q1 should not need a heatsink.
2. The circuit is designed for a supply voltage of 120V.
3. The printed circuit pattern is reproduced here larger then real life for clarity. It will need to be resized to the scale at the bottom of the image if you intend to transfer it to a board.

The circuit functions as an on/off flip flop. Illuminate it with your remote once to turn it on, then again to turn it off.

Sensitive Clap Switch Circuit

This is the circuit of a very sensitive clap switch. It switches ON/OFF a White LED or electrical appliances through claps. The circuit can sense the sound of claps from a distance of 1-2 meters. Condenser Mic picks up sound vibrations caused by the clap.
These sound vibrations are given to the inverting input (pin2) of IC1. It amplifies the sound collected by the Mic.
Resistor R2, R3 and variable resistor VR1 adjust the sensitivity of the amplifier. Resistor R1 set the sensitivity of Mic. The amplified output pulses from IC1 passes to the input of IC2 (CD 4017). Resistor R4 keeps the input (pin14) of IC2 low so as to prevent false triggering.
IC2 is a decade counter IC which is wired as a toggle switch. That its outputs 1 and 2 (pins 2 and 3) becomes high and low when the input pin14 receives pulses. Pin4 (output4) is connected to the reset pin15 so that further counting will be inhibited. The high output from IC2 passes through the current limiter R6 to the base of switching transistor T1. When T1 conducts, White LED (D2) turns on. If a 6V 100 ohms relay is connected to the points marked (A and B), the relay will also energize and the load (bulb or electrical equipments) will be switched on. In the next clap, output pin 2 becomes low and relay and White LED will be switched off. LED D1 (Red LED) indicates the OFF position.

PCB Layout of Sensitive Clap Switch Circuit

PCB Relay Pins
2 + 5 – Relay coil
1 – Common- Here connect the phase line
3 – NO ( Normally Open) – Here connect the load phase in series to switch ON the load when relay turns on
4 – NC ( Normally Connected) – Here connect the load phase in series to switch OFF the load when relay turns on
In the PCB layout, points A and B are used to connect relay coil pins 2 and 5

PIR. motion sensor alarm circuit

A motion detection alarm circuit using a PIR.SENSOR motion detection, if the move is a positive light from the PIR sensor, triggered by a delay circuit, Q1 and relay it to work and hold for about 20 seconds. to apply to the siren to signal a warning to stop, or discarded by the switch S1 is a switch that controls it. Or a remote control.