Church bell Controller
https://www.electronics-lab.com/project/church-bell-controller/
Description This circuit is a church bell controller. Basic component is an ATmega32 microcontroller. At the circuit 1 24LC32 eeprom memories is being used. As control I created a menu who will be appeared on 4×20 LCD (Liquid Crystal Display). The menu browsing can be done by 6 buttons at the face of the […]
2.4V to 5V Step Up DC-DC Converter
https://www.electronics-lab.com/project/2-4v-to-5v-step-up-dc-dc-converter/
This project is a step up DC to DC power converter able to convert 2.4V – 5V to 5Vdc. Description This project has been designed around Texas Instruments LM2623 IC, The LM2623 is a high efficiency, general purpose step-up DC-DC switching regulator for battery powered and low input voltage systems. It accepts an input voltage […]
+/-12V Dual Power Supply
https://www.electronics-lab.com/project/12v-dual-power-supply/
This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply. Description Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other equipment or projects required dual supply. […]
Dual Adjustable Power Supply
https://www.electronics-lab.com/project/dual-adjustable-power-supply/
This project is a solution to power up most of devices or projects requiring dual (+/-) adjustable power supply. Description The circuit is based on LM317 positive and LM337 negative voltage regulators. LM317 series of adjustable 3 terminal regulator is capable of supplying in excess of 1.5A over a 1.2V to 30V DC output range, […]
9V to 48V DC-DC Converter
https://www.electronics-lab.com/project/9v-to-48v-dc-dc-converter/
This project is a 8-12Vdc to +48Vdc DC-DC converter based on MC34063 switching regulator. Description It’s a simple project of a DC-DC converter to make a phantom power supply for professional microphones. It can deliver 15-20mA at 48VDC. It ‘s based on MC34063 DC-DC step-up, step-down and boost converter. Input is between 8-12V DC […]
0-30V Laboratory Power Supply
https://www.electronics-lab.com/project/0-30v-laboratory-power-supply/
This project is based on the 0-30 VDC Stabilized Power Supply with Current Control 0.002-3 A and a new PCB layout is introduced here. It’s a stabilized power supply with variable output voltage in the range 0-30Vdc (33Vdc peak) – and variable current 3A and is ideal for your laboratory power supply. Description Schematic and PCB are […]
Variable Power Supply with LM7812
https://www.electronics-lab.com/project/variable-power-supply-with-lm7812/
This project is a simple variable power supply using the famous LM7812 regulator IC. It consists of two boards, the main board which includes the regulator, capacitors, bridge rectifier and potentiometer and a second board that includes the mains tranformer, the fuse and a switch. Description I designed this variable power supply which is based […]
MCU Controlled Spot Welder
https://www.electronics-lab.com/project/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. Description I always wanted a spot welder, so I decided to built one. I wanted to build a capacitance discharge one but I couldnt afford for the capacitors at this time. So […]
Digital Multiple Voltage Power Supply
https://www.electronics-lab.com/project/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. This guide will walk you through every aspect of the building process; however some basic […]
Mini variable power supply
https://www.electronics-lab.com/project/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. C1 filters off the AC ripple. If you find the circuit output too noisy add another electrolytic capacitor over the output terminals. Value can be between 10 and 100uF/25V. The output […]