Capacitor bank switch for PFC (Power factor correction)

 This is a Capacitor bank switch for PFC (Power factor correction) Parts List:400V 0.1uF capacitor (10PCS) 400V 1uF capacitor (20PCS) (the capacitor value is optional but should be 1uF or less)Toggle Switch (30PCS)10A Fuse with holderTerminal 2P (2pcs) Video: &nb...

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Composite Video to analog XYZ signal for Oscilloscope

This Circuit is a Composite Video to analog XYZ signal converter which take s-video signal and display it on an analog Oscilloscope CRT display. It uses IC LM1881 which is a composite video sync separator.    Parts List:IC LM1881 (SMD or THT)IC AD8032 (SMD or THT)Transistor 2N2222 (4pcs)Transistor 2N3906 (2pcs) Diode 1N4148 (2pcs)Potentiometer 1KPotentiometer 10KCapacitor 680uF 16VCapacitor 100nF (3pcs)Capacitor 10nFCapacitor 22nFResistor 180 ohm Resistor 680 ohmResistor 180...

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How Power Factor Correction Affects Battery runtime of an Inverter/UPS ?

Power factor correction (PFC) improves the efficiency of power transfer from an inverter or UPS to the load, but it does not directly increase battery runtime in most cases. How Power Factor Correction Affects an Inverter/UPS1. Reduced Apparent Power Demand:PFC reduces the apparent power (VA) drawn from the inverter by making the load more resistive (higher power factor, ideally 1.0).This means the inverter/UPS operates at lower current, reducing heat losses in its components.2. Lower Internal...

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How to compare 3 different voltages

This circuit is an op-amp comparator with three inputs, to compare 3 different voltages and show the higher one by using an LED. Parts list:IC CD4001IC LM324Resistor 510 ohm (3pcs)RED LEDGREEN LEDBLUE LEDIC socket 14 pin(2pcs)Capacitor 220uFCapacitor 100nF Circuit:VCC could be any voltage between 4 to 15VVideo: &nb...

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Automatic Transfer Switch ATS / Changeover with 3 Input Sources

This circuit is an Automatic Transfer Switch ATS / Changeover with 3 Input Sources (3 ways).It has 3 seconds time delay to transfer between Grid and Solar system (No delay time for Generator).Maximum current up to 20 Amps.Works with both 110V and 220V systems. Parts list:IC LM358IC Socket 8dip Power supply HI-LINK 12V 3W 250mA Resistor 51K (2pcs)Resistor 3K (2pcs)Resistor 1K (2pcs)Resistor 10K (4pcs)Resistor 560Resistor 3.9K Capacitor 100uF 16VOptocoupler PC817RED LED BLUE LEDScrew TerminalRelay...

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DIY 3 phase Motor and Phase Sequence Indicator / Rotation Tester

This is a DIY Three Phase Sequence Indicator / Rotation Tester  Parts list: IC LM324IC E50DResistor 330K (3pcs) Resistor 330 ohm (8pcs) Resistor 10K (6pcs)  Resistor 10M (3pcs) Diode 1N4007(3pcs)Diode SS14Inductor 47uHWhite LED (2pcs) Red LEDYellow LEDGreen LED Capacitor 100nFCapacitor 100uF 10VON/OFF Switch Stepper motor 5V (28BYJ-48)Transistor S9014 (3pcs)Battery 3.7V (18650) Battery charger module for 18650 batteryIC Socket 14 pin Circuit:You...

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DIY Full Array Local Dimming Backlight

This is a modification to convert an LED LCD TV to Full Array Local Dimming Backlight. Parts list:1W COB LED (98pcs)LDR (98pcs)MOSFET SI2300 or SI2306 (98pcs)Resistor 4.7K (98pcs)Resistor 1ohm (98pcs)  Circuit:Repeat the same circuit 98 timesYou can order the PCB from PCBWay.com here: https://www.pcbway.com/project/shareproject/Full_Array_Local_Dimming_TV_Backlight_6013e5cc.html 3D Printed Parts:https://www.tinkercad.com/things/9z6gjJJRLsc-local-dimming-tv-backlight-part-12 https://www.tinkercad.com/things/eBGjOFxDnML-local-dimming-tc-backlight-part-22...

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220V Lamp flasher

 This is a simple 220V Lamp flasher circuit.Parts list:Triac BT136Diac DB3Diode 1N4007Capacitor 47uF 50VResistor 100K 2WResistor 1.5K Circuit: Video:&nb...

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LED Driver using RM9003

Constant Current LED Driver With Single IC RM9003 (6V to 600V) English datasheet: https://iranmls.com/wp-content/uploads/2021/10/RM9003A-Datasheet.pdf  Current depends on the value of resistor (Rs), calculated by following formula:  Video:&nb...

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Automatic Dark switch / photocell

This circuit is an Automatic Dark switch or photocell using a solar panel.It can switch ON the light bulb at night and turns it OFF at day time automatically.You have to connect it across the garden switch.NOTE: The solar panel here used just to activate the relay, not to produce the high voltage for the light bulb, you need an external 110/220V source (grid power).  Parts list:Solar panel 6V 1.1WRelay 5VDiode 1N4007Circuit:Video:&nb...

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Using Distance sensor without microcontroller

 This is how to use infrared distance sensor Sharp 2Y0A21 without using microcontroller ! Parts list: Sharp 2Y0A21LED barIC LM3915Capacitor 220uFCapacitor 100nFResistor 10K (4pcs)Resistor 390Battery holder Circuit: Video:&nb...

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Electronic distance meter without microcontroller

This circuit is an ultrasonic distance meter without using microcontroller.Distance range for this circuit is between 2cm up to 450cm ,However i get the best accuracy at distance less than 300cm.  You can order the PCB from here:https://www.pcbway.com/project/shareproject/Ultrasonic_distance_meter_without_microcontroller_16d958c1.html  Parts list:Ultrasonic module HC-SR04IC 40110 (3pcs)IC NE555 (2pcs)IC 7805Seven segment common cathode (3pcs)Resistor 1K (22pcs)Resistor 2K Resistor...

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Resistance meter without microcontroller

This is an educational circuit to measure resistance (ohm meter) without using any microcontroller. It can measure resistance from 10K up to 9.9M.You can order this PCB from PCBWay: https://www.pcbway.com/project/shareproject/Digital_Resistance_Meter_without_microcontroller_a98f1825.html Parts list:IC 40110 (7pcs)IC 4017IC 4013IC LM358LED IC 7805 (With heatsink)Transistor 2N2222 (2pcs)Mosfet IRFZ44N7segment display (7pcs)Crystal 4 MHzCapacitor 100nF (3pcs)Capacitor 100uF (2pcs)Capacitor...

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Online UPS with Capacitors

This circuit is a short running time online UPS that used high voltage capacitors to stores energy, instead of battery !It can be used in different cases :1-Connecting two (or more) gasoline generator together in parallel to increase the output power.2-High voltage solar inverter without transformer3-Online UPS with short running time Parts List:EGS002 SPWM Board (With display)Mosfets 25N50 (4pcs)Heatsink 10cmx10cm + Insulation pad for mosfetsResistor 10 ohm (4pcs)Resistor 10K (5pcs)Resistor 68K...

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Magnet polarity detector

This circuit is a Magnet polarity detector using hall effect sensor IC W277. Parts List:IC W277Transistor 2N3906 (SMD A2) or any other PNP transistor (2pcs)Common cathode 7-segment displayResistor 1K (2pcs)Resistor 10K (2pcs)Resistor 330 ohm Reed switch (normally open)3V Coin cell Battery with holder Circuit:    You can order this PCB from PCBWay.com: https://www.pcbway.com/project/shareproject/Magnet_Polarity_detector_12a1d736.html    3D Printed cas...

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Ceiling Fan with Solar Panel (driver circuit)

 This is the driver circuit for running low voltage AC Ceiling Fan with Solar Panel.Parts List:IC IR2113 (2pcs)IC NE555 IC LM7805230N55 or IRFZ44N (4pcs)Transistor 2N2222Diode 1N4148 (2pcs) Capacitor 1000uF 50VCapacitor 100uF 50V (2pcs)Capacitor 100nF (5pcs)Resistor 180 ohm (4pcs)Resistor 10K (4pcs)Resistor 1.2KResistor 1.5KResistor 180KResistor 33K  Circuit: If the input voltage was more than 25V you need a voltage regulator for IC IR2113 (could be a zener diode)Or use this...

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