Thursday, October 24, 2019

Random number generator with LEDs / Roulette

This circuit is a Random number generator with 10 LEDs (Roulette)  for picking random number between 1 and 10.

Parts list:
IC 4017
IC 555
LEDs (10pcs)
Buzzer
Transistor BC557
Capacitor 0.47uF
Capacitor 100nF
Resistor 1K
Resistor 3.9M (2pcs)
Resistor 15K
Resistor 510R

Circuit:

Random number generator with LEDs / Roulette

Random number generator with LEDs / Roulette


Video:

 

Thursday, October 17, 2019

Photocell dark switch with 2 wires

This circuit is a 110/220V AC Photocell switch (Dark activated switch) with 2 wires, it turns ON the lamps at the night and turns them OFF at the day time automatically.
The standby state power consumption in this circuit is very low, about 0.05W only, 
But the commercial photocell consume about 1.6W in the standby state. (32 times more)
The circuit working with both 110V & 220V AC and the Max. load can be 4A (LED, CFL & incandescent lamps).


Parts list:
IC 4093
SCR C106M
Bridge diode 8A
Resistor 30K
Resistor 1M
LDR
Zener diode 10V

Circuit:

220V AC Photocell switch (Dark switch)

220V AC Photocell switch (Dark switch)

220V AC Photocell switch (Dark switch)

 
Video:



Wednesday, October 9, 2019

Automatic changeover Circuit

This circuit is a simple 110/220v Automatic changeover circuit that can switching two electric sources to the Loads. It also has auto inverter shutdown. max. Load can be about 30A.

Parts list:
Relay 24v 10A
Relay 24V 30A
Resistor 100 or 200 ohm 1W
Zener diode 24v 1W
Diode 1N4007 (4pcs)
Capacitor 870nF 400v
Capacitor 100v 50v
Terminal connector 2Pin(2pcs)
 
Circuit:

Automatic changeover Circuit

Automatic changeover Circuit


Video:


Tuesday, October 1, 2019

Power Saving Circuit for TV and Satellite / Smart Switch

This is Power Saving Circuit, it can be used for any electronic and electric devices that have to turns ON and OFF together at the same time, such as TV and Satellite or PC Monitor and tower(system unit). So it helps to power saving by prevent leaving one of them running all day long.
Maximum load can be 4A if you using a proper heatsink for the SCR.


Parts list:

SCR C106
Current transformer 5A/5mA
Capacitor 10uF
Bridge diode
Resistor 20K
Resistor 100K
Multiturn Potentiometer 500K
Diode 1N4148
Terminal connector 2PIN

Circuit:
Power Saving Circuit for TV and Satellite / Smart Switch

Power Saving Circuit for TV and Satellite / Smart Switch

Video:


Saturday, August 17, 2019

Color sensor without Arduino / microcontroller

This circuit is Color sensor without using Arduino or any other microcontroller
Using LDR, LEDs, IC 4017 and IC LM358.
I explained the circuit in this video:  https://youtu.be/fX0bFtWSHus

Color sensor without Arduino / microcontroller


Parts List:
IC 4017
IC LM358
Potentiometer 10K
Potentiometer 5K (3pcs)
Red LED (2pcs)
Green LED (2pcs)
BlueLED (2pcs)
LDR
Resistor 100K (3pcs)
Resistor 100 ohm (2pcs)
Resistor 1M
Resistor 5.1K
Ceramic capacitor 100nF 

Circuit:

Color sensor without Arduino / microcontroller


Video:




Sunday, August 4, 2019

Visitor counter without microcontroller

This project is Visitor counter Without microcontroller. It can help to Power saving by switch OFF the room lamps when no body in the room.
The circuit Explained in this Youtube Video: 

You can order the PCB here on PCBWay.com

Visitor counter without Arduino



Parts list:
IC 40110 (2pcs)
IC 4093
Optocoupler PC817 (2pcs)
7Segments common cathode (2pcs)
Diode 1N4007 (4pcs)
Laser 5v 5mW (2pcs)
LDR (2pcs)
LED
Relay 5V
Transistor S8550
Capacitor 100nF (2pcs)
Capacitor 10uF
Capacitor 220uF
Resistor 1M
Resistor 1.5K (2pcs)
Resistor 100K
Resistor 6.8K
Resistor 4,7K (2pcs)
Resistor 200R (15pcs)

Circuit:

Visitor counter without microcontroller



Gerber File and order the PCB: 
Visitor counter without microcontroller


Video:

Wednesday, July 24, 2019

Active Power Factor Correction Using MC33262

This project is Active Power Factor Correction Using MC33262 

Parts list:
IC MC33262
1:12 Transformer 4.7mH (Inductance calculated by formulas)
Bridge diode
EMI filter
Ultra fast diodes UF5402(2pcs)
Capacitor 0.47uF 50v 
Capacitor 220uF 450V
MOSFET 8N50E
Resistor 100K
Resistor 22K(2pcs)
Resistor 3.3M (2pcs)
Resistor 30K 
Resistor 1.5K
Resistor 2.2R

Circuit:
Following circuit designed for 15W load, you have to calculate the resistor and inductor value using some formulas in the datasheet here: 

Active Power Factor Correction Using MC33262
Gerber File:

EeasyEDA File:

Results: 
Current waveform (yellow line) is for an LED lamp with power factor of 0.68, as you can see the current waveform become sinusoidal after using the circuit.
Active Power Factor Correction Using MC33262

Video:
For more details please watch this video