Projects Projects
Variable Power Supply with LM7812
This project is a simple variable power supply using the famous LM7812 regulator IC.
MCU Controlled Spot Welder
This project is a controller for a dual pulse spot welder that has some nice features that are controlled using a LCD interface.
Digital Multiple Voltage Power Supply
1.2 to 33 Volts DC @ 3 Amps Description This is simple to build microcontroller controlled power supply that can switch between 5 (or 32 or more) preconfigured voltages between 1.2 to 33 volts dc and up to 3 amps.
Mini variable power supply
Description T1 steps down AC voltage from 115VAC (or 220VAC) to about 8VAC and is then rectified via bridge rectifier BR1 to about 11.52Vdc.
Charger for mobile phones
Description Most mobile chargers do not have current/voltage reguLation or short-circuit protection.
Li-Ion Charger
Description The LP2951 regulator is manufactured by National Semiconductors.
Lead Acid Battery Charger #2
Description The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting of Q1, R1, and R4.
Lead Acid Battery Charger #1
Description Except for use as a normal Battery Charger, this circuit is perfect to ‘constant-charge’ a 12-Volt Lead-Acid Battery, like the one in your flight box, and keep it in optimum charged condition.
Simple 78xx Current Booster
Description Voltage regulators such as the LM78xx, and LM317 series (and others) sometimes need to provide a little bit more current then they actually can handle.
1.2v LED Flasher – Joule thief
This is a 1.2-volt single transistor flyback (Joule Thief) circuit that features a third coil.
13.8V/40A Stabilized Power Supply
This power supply was designed for ham-radio use and has been in operation for over 10 years.
Dual Voltage Power Supply
Description The following circuit Diagram of (DUAL VOLTAGE POWER SUPPLY ) can be used for Misc..