This project used the popular PIC16F84A microcontroller which is a program written in assembly language. GSM phone with which the device was tested by Siemens M35i (19200bps 8-N-1). The device has to work with other (older, cheap) Motorola phones such as S25, C35 (i), A65 and so on (X35, X45) … Source: Trax

LCF-meter , a inductance meter (from 10 nH to 3Gn), capacitance (from 0.1pF to 2mkF) and frequency (10 Hz to 1.1GHz). Source: picmicro

Award winner from VingPeaw Competition 2543, the robot built with 2051, L293D, and four IR sensors. Simple circuit and platform, quick tracking and easy-understand program using C language. Microcontrollor AT89C2051 and H-Bridge driver L293D were used  to control direction and speed of motor. Source: Plermjai Inchuay

This project (GSM controller ) is a device that allows you to control appliances using SMS messages. There are also 4 inputs for connecting sensors so the device will send an alarm SMS or even call you to report an alarm condition. Autor of this project has been successfully tested on: – Nokia 7110 (19200 [...]

Tiny Basic Controller (TBC) is a simple device that can operate as a PLC (program logic controller) for home automation, control, etc. For example, this one can dial-up by modem to the remote computer and send the status of the controlled system, can control some processes, temperature regulation, battery charging, can be used for educations [...]

This project it is based around a PIC16F627 micro and It is build as a countdown timer for a UV exposure box for PCB development that uses fluorescent UV lamp with following features: Adjustable time in 15-second increments (up to 10 minutes) Lamp preheat feature Two button operation (with audible feedback) Countdown alarm (when timer [...]

This driver may be used for a 3 Axis CNC Machine. Based on the PIC16F870, for 3x Unipolar(5, 6 or 8 wire) Stepper Motors. It provides Full Stepping for good torque, with ability to toggle auto-shutdown of motor coils, which allows the motors and current regulation device to run cooler and require a lower output [...]

This development board is perfect for all the newbies that want to learn about AVR Microcontrollers or want to build some nice projects with it. ATMEGA8 Development Board contains: ISP programer RS232 comunication (serial port) High Power Voltage control ON/OFF Circuit All pins are marked PC power jack Source: Pop Gheorghe

How many times have you wished that you recorder your recent telephone conversation? I have, many many times. So thanks to [Trax] that he finally decided to make this happen by using PC and a piece of hardware (powered from USB) to record audio from phone line to MP3 format. He wanted this thing to [...]

The 78xx family is a very popular choice for many electronic circuits which require a regulated power supply, due to their ease of use and relative cheapness. When specifying individual ICs within this family, the xx is replaced with a two-digit number, which indicates the output voltage  the particular device is designed to provide (for [...]

Three small simple audio generator, producing a square wave, sine and triangular outputs on three separate waveform selectable via a small three-position switch or through a small mixer single output. These arrangements are based on the use of an ASIC, the ICL8038 (Intersil or Harris), also available under reference XR8038 (Exar). This circuit contains almost [...]