Search Results for : 7805
Simple LC meter
This project is a simple LC meter based on PIC16F682A mcu. Description Here is another piece of laboratory equipment - LC meter. This type of meter, especially L meter is hard to find in cheap commercial multimeters. Schematic of this one came from this web...
Continue ReadingPIC16F688 Digital Voltmeter
Introduction This project describes how to make a digital voltmeter using a PIC microcontroller. A HD44780 based character LCD is used to display the measured voltage. The PIC microcontroller used in this project is PIC16F688 that has 12 I/O pins out of which 8 can serve as analog...
Continue ReadingPIC16F84A Gas Detector using GH-312 sensor
Introduction This is a gas detecting circuit capable of sensing many different types of gases. The sensor used is the GH-312 and from the datasheet it is capable of sensing gases like smoke, liquefied gas, butane and propane, Methane, alcohol,hydrogen,...
Continue ReadingVoltmeter + Ammeter LCD panel
Introduction This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional...
Continue ReadingProgrammable Home Security Alarm System
Introduction In this project we design low cost high performance programmable home security system and there is no need to contact a company like Safemart home security for setup. This system uses a few LDR's as input sensors. When above sensor(s) get triggered system may dial...
Continue ReadingMCU 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...
Continue ReadingDigital 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...
Continue ReadingSimple 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. If that is the case, this little circuit can help out. A power transistor such as the 2N3772 or similar can be used...
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