Make Ferrite Toroidal Transformer for Inverter (video)

Build your own variable 0-60V 0-30A DC Adjustable bench Power Supply

Build an Analog ESR Meter With Moving-Coil Meter Precision

I was always envious of my friend’s analog ESR meter that allowed him to check and find bad capacitors while they were still in circuit. The particular meter he had is no longer available, which meant doing some research to understand how they worked and to come up with my own version.

Calculating mains frequency power transformers

In this page a simple method of calculating mains frequency closed-core power transformers. This is intended for home brewing, repairing and modifying transformers. Please remark that even if this method and some equations could be generalized, only classical cores composed by steel plates are taken into account.

How to Calculate Ferrite Core Transformers

 

Calculating ferrite transformer is a process in which engineers evaluate the various winding specifications, and core dimension of the transformer, using ferrite as the core material. This helps them to create a perfectly optimized transformer for a given application.

EEVblog #279 - How NOT To Blow Up Your Oscilloscope!

Regulated Car Battery Charger Circuit for Garage Mechanics

If you are an automotive technician, vehicle technician, or a motor mechanic, you may find this cheap yet powerful car battery charger circuit extremely handy, as it can be used for charging all types of car and motorcycle battery overnight with minimum effort.

Make your own Electronic Candle

Electronic or flameless candles are an alternative to traditional wick candles. These are used for home décor and do not carry the risk of fire as these have LEDs that glow instead of an open flame.

DIY 30V-70V TO 12V HIGH CURRENT BUCK CONVERTER WITH UC3845

Ferrite toroid calculation:

World's Simplest Electric Train - Το απλούστερο Ηλεκτρικό Τρένο

Build A Simple VFD or Variable Frequency Drive!

 

 

Precision 1Hz Clock

This precision clock uses just two ICs and one junction field-effect transistor (JFET) in conjunction with a commonly available crystal and a handful of other passive components.

Measuring Power Inductors

 

Most LCR meters measure components with a current of just a few milliamps. For capacitors and resistors this is fine, but the inductance (and properties in general) of power inductors vary with the (DC) current level.

Laptop Power Bank INVERTER with UC3843

https://www.youtube.com/watch?v=_UT_hFOEp1g

Fast Charging TP4056

https://www.youtube.com/watch?v=sAy7qJTXWA8

 

Increase charging current TP4056

https://www.youtube.com/watch?v=m9VPWE4dCvw

 

Increase charging current TP4056 (video)

https://www.youtube.com/watch?v=m9VPWE4dCvw

Precision 1Hz Clock

This precision clock uses just two ICs and one junction field-effect transistor (JFET) in conjunction with a commonly available crystal and a handful of other passive components.

DHT11 vs DHT22 with Arduino (video)