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 holder
Terminal 2P (2pcs)
Video:
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 1K
Potentiometer 10K
Capacitor 680uF 16V
Capacitor 100nF (3pcs)
Capacitor 10nF
Capacitor 22nF
Resistor 180 ohm
Resistor 680 ohm
Resistor 180 ohm
Resistor 1k
Resistor 2.2k (3pcs)
Resistor 3.3k (3pcs)
Resistor 6.8k (2pcs)
Resistor 2.2k (3pcs)
Resistor 4.7k
Resistor 5.6k
Resistor 68k (2pcs)
Resistor 680k
9V Battery
9V Battery cable/holder
IC Socket 8dip (2pcs)
ON/OFF Switch
Knob for Potentiometers (2pcs)
BNC Connector (4pcs)
BNC Cables (4pcs)
HDMI to AV Converter (optional)
Circuit :
NOTE: If you want to use different op-amp (instead of AD8032) it must be rail to rail op-amp otherwise the circuit not going to work properly.
Download the circuit with better resolution (PDF) here:
https://drive.google.com/file/d/1levyhMAB9TWcYP5NufMxrQ7pRDUImYUH/view?usp=drive_link
You can order this PCB from PCBWay here:
https://www.pcbway.com/project/shareproject/Video_on_Oscilloscope_3b6c3d70.html
The two holes near the battery could be use to holding the battery in place by a piece of wire !
Video:
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/UPS
1. 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 Losses:
Since lower currents flow through the inverter's internal wiring and components, losses due to resistance (I²R losses) are reduced.
This can slightly improve efficiency but does not significantly increase battery runtime.
Why Battery Runtime Won’t Increase Much
Battery runtime depends mainly on watt-hour capacity (Wh = Ah × V) and the actual real power (W) consumed by the load.
If the load needs 500W, it will still consume 500W even if PFC is applied.
The inverter draws the same real power from the battery regardless of power factor.
Power factor affects the inverter's apparent power handling, but not the real power demand from the battery.
When PFC Might Help Battery Runtime
If the inverter is undersized and struggling to provide enough VA for low power factor loads, it may heat up and operate inefficiently.
A poor power factor can cause excess heating in the inverter due to high current draw, reducing efficiency and wasting some energy.
Correcting power factor can slightly reduce these losses, indirectly improving battery runtime by a small margin.
Better Ways to Increase Battery Runtime
If you want to extend the battery life of your inverter or UPS, consider:
✔ Using a larger battery capacity (higher Ah rating)
✔ Switching to a more efficient inverter with a better conversion efficiency
✔ Reducing load power consumption (LEDs instead of incandescent bulbs, efficient appliances, etc.)
✔ Using a pure sine wave inverter (they are more efficient with inductive loads like motors and transformers)
Conclusion
PFC improves efficiency but does not significantly increase battery runtime unless your inverter is experiencing excessive heating due to a very poor power factor. The best way to increase runtime is to use larger batteries or reduce power consumption.
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 CD4001
IC LM324
Resistor 510 ohm (3pcs)
RED LED
GREEN LED
BLUE LED
IC socket 14 pin(2pcs)
Capacitor 220uF
Capacitor 100nF
Circuit:
VCC could be any voltage between 4 to 15V
Video:
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 LM358
IC Socket 8dip
Power supply HI-LINK 12V 3W 250mA
Resistor 51K (2pcs)
Resistor 3K (2pcs)
Resistor 1K (2pcs)
Resistor 10K (4pcs)
Resistor 560
Resistor 3.9K
Capacitor 100uF 16V
Optocoupler PC817
RED LED
BLUE LED
Screw Terminal
Relay 12V 20A (4pcs)
Bridge diode DB107 (2pcs)
Diode 1N4007 (3pcs)
Transistor 2N2222 (2pcs)
Circuit:
You can order this PCB from PCBWay.com:
Video:
This is a DIY Three Phase Sequence Indicator / Rotation Tester
Parts list:
IC LM324
IC E50D
Resistor 330K (3pcs)
Resistor 330 ohm (8pcs)
Resistor 10K (6pcs)
Resistor 10M (3pcs)
Diode 1N4007(3pcs)
Diode SS14
Inductor 47uH
White LED (2pcs)
Red LED
Yellow LED
Green LED
Capacitor 100nF
Capacitor 100uF 10V
ON/OFF Switch
Stepper motor 5V (28BYJ-48)
Transistor S9014 (3pcs)
Battery 3.7V (18650)
Battery charger module for 18650 battery
IC Socket 14 pin
Circuit:
You can order the PCB from PCBWay here:
3D printed part:
https://www.tinkercad.com/things/8NgFQe2ENGs-3phase-rotation-tester-
Video:
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 times
You 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
Video:
This is a simple 220V Lamp flasher circuit.
Parts list:
Triac BT136
Diac DB3
Diode 1N4007
Capacitor 47uF 50V
Resistor 100K 2W
Resistor 1.5K
Circuit:
Video:
Constant Current LED Driver With Single IC RM9003 (6V to 600V)
English datasheet: https://iranmls.com/wp-content/uploads/2021/10/RM9003A-Datasheet.pdf
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 1.1W
Relay 5V
Diode 1N4007
Circuit:
Video:
This is how to use infrared distance sensor Sharp 2Y0A21 without using microcontroller !
Parts list:
Sharp 2Y0A21
LED bar
IC LM3915
Capacitor 220uF
Capacitor 100nF
Resistor 10K (4pcs)
Resistor 390
Battery holder
Circuit:
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:
Parts list:
Ultrasonic module HC-SR04
IC 40110 (3pcs)
IC NE555 (2pcs)
IC 7805
Seven segment common cathode (3pcs)
Resistor 1K (22pcs)
Resistor 2K
Resistor 3K (2pcs)
Resistor 20K
Resistor 33K
Resistor 100K
Capacitor 680uF
Capacitor 100uF
Capacitor 100nF (2pcs)
Capacitor 220pF
Transistor 2N2222
Multiturn potentiometer 200K
IC Socket 16DIL (3pcs)
IC Socket 8DIL (2pcs)
Battery 9V
Holder for 9V battery
Dip switch 1p
Circuit:
For better resolution you can download the circuit as a PDF file from here:
https://drive.google.com/file/d/12MKksudA8kyZsG782npDamxVtN9INbnZ/view?usp=sharing
Video:
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:
Parts list:
IC 40110 (7pcs)
IC 4017
IC 4013
IC LM358
LED
IC 7805 (With heatsink)
Transistor 2N2222 (2pcs)
Mosfet IRFZ44N
7segment display (7pcs)
Crystal 4 MHz
Capacitor 100nF (3pcs)
Capacitor 100uF (2pcs)
Capacitor 1uF 400v CBB
Capacitor 220pF (2pcs)
Resistor 470 ohm (50pcs)
Resistor 6.8K
Resistor 10K
Resistor 20K
Resistor 1K
Resistor 2M
Resistor 120K
Resistor 5.6K
Resistor 3.3K
Resistor 150 ohm
Resistor 100K
Resistor 680K
Push tactile Switch 6 pins
IC Socket 8pins
IC Socket 14pins
IC Socket 16pins (8pcs)
ZIF Socket 14pins
Circuit:
You can download this circuit with higher resolution as PDF file from here:
https://drive.google.com/file/d/1t-9Xey-s2JFWnAIgs_u6tn-R1tBjlrR2/view?usp=sharing
Video:
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 transformer
3-Online UPS with short running time
Parts List:
EGS002 SPWM Board (With display)
Mosfets 25N50 (4pcs)
Heatsink 10cmx10cm + Insulation pad for mosfets
Resistor 10 ohm (4pcs)
Resistor 10K (5pcs)
Resistor 68K (4pcs)
Resistor 200K
Resistor 1K
Resistor 150K (2pcs)
Resistor 0.1 ohm 2W
Resistor 50 ohm 50W
Potentiometer multiturn 10K
NTC 10K
Capacitor 100nF (2pcs)
Capacitor 1uF
Capacitor 1000uF 16v
CBB Capacitor 2.2uF 630V
CBB Capacitor 1uF 400V (2pcs)
CBB Capacitor 100nF 400V (2pcs)
Electrolytic Capacitor 6000uF 350V or 400V (4pcs)
Inductor 2mH (ferrite ring with diameter of 30mm and about 200 turns of 0.7 mm copper wire)
Diode 1N4148 (4pcs)
Diode 1N4007 (4pcs)
Bridge diode GBJ3510
12V Relay
Transistor 2N2222 (2pcs)
JFET 2SK170
12V 3W power supply
Cooling Fan 12V
Voltage regulator LM7805
Mains output Connectors Socket
Mains Input Connectors
10A 250V AC Fuse with holder (2pcs)
ON/OFF Switch 16A 250V
MOV (Varistor) 14D431K (2pcs)
Audio transformer 600 ohm 1:1
LED 5mm (2pcs)
Circuit Diagram:
For better resolution circuit you can download this circuit as PDF file from here:
https://drive.google.com/file/d/1MpCMolHz525S07W1W1XjGRK3-dz_rwvF/view?usp=sharing
3D Screw Insulator Cap :
https://www.tinkercad.com/things/8ag4EqVvyaO-screw-cap-insulator
You can order this PCB from PCBWay.com:
https://www.pcbway.com/project/shareproject/Online_UPS_with_Capacitors_14e23965.html
Video:
This circuit is a Magnet polarity detector using hall effect sensor IC W277.
Parts List:
IC W277
Transistor 2N3906 (SMD A2) or any other PNP transistor (2pcs)
Common cathode 7-segment display
Resistor 1K (2pcs)
Resistor 10K (2pcs)
Resistor 330 ohm
Reed switch (normally open)
3V Coin cell Battery with holder
Circuit:
https://www.tinkercad.com/things/f2PPsV2GhBA
https://www.tinkercad.com/things/1Ai50KVamzV
Video:
This is the driver circuit for running low voltage AC Ceiling Fan with Solar Panel.
Parts List:
IC IR2113 (2pcs)
IC NE555
IC LM7805
230N55 or IRFZ44N (4pcs)
Transistor 2N2222
Diode 1N4148 (2pcs)
Capacitor 1000uF 50V
Capacitor 100uF 50V (2pcs)
Capacitor 100nF (5pcs)
Resistor 180 ohm (4pcs)
Resistor 10K (4pcs)
Resistor 1.2K
Resistor 1.5K
Resistor 180K
Resistor 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 one with pure sine wave output:
Parts List:
EGS002 SPWM Board
Mosfets IRF840 or 11N60 (4pcs)
Heatsink + Insulation pad and washer for mosfets
Resistor 4.7 ohm or 10 ohm (4pcs)
Resistor 10 K (4pcs)
Resistor 6.8 K
Resistor 68 K
Resistor 1K or 2.2K
Resistor 0.1 ohm 2W
NTC 10K
Capacitor 100nF
Capacitor 10nF
Capacitor 2.2uF 630V
Capacitor 22uF 400V
Inductor 2mH (ferrite ring with diameter of 30mm and about 200 turns of 0.7 mm copper wire)
Diode 1N4148 (4pcs)
Transistor 2N2222
12V 3W power supply
Cooling Fan 12V
Voltage regulator 78L05
Connectors HB825
Inverter battery Terminal Connector M5
ON/OFF Switch
Video: