Got sick of the high prices of Home Security systems ?? have old mobile sets don’t know what to do with ? build a cheap alarm system that will notify you on your mobile by SMS. ready ?? grab the tools ! What you’ll need An old mobile phone set with supply (charger). Cheap door [...]

I  made from an ordinary popcorn machine. In basic it works by a fan blowing air past a heating element through the green coffee beans. By controlling the fan speed, I was able to control the temperature of the air roasting the beans. But, the roasting process turned out to be quite hands on, as [...]

This submini USB scope is based on a Atmel Tiny45 cpu and cost less than 5€ with a homemade pcb. It has 2 analog inputs and can supply 5V ont the 4 pins header on the right. One of the inputs can be scaled down with the trim pot. The firmware in the Tiny45 is [...]

Some time ago I bought a pair of in ear headphones and I am very pleased with them, but I don’t have a decent headphone amplifier for them at home. So I searched the web and became very interested in building a headphone amplifier BUF634 and OPA627 combination. I decided to use the circuit in [...]

Introduction I need for my high quality DAC convertor from USB to S/PDIF. I choose PCM2704 circuit, which sent me TI company like sample. Circuit has analog output for headphones and digital S/PDIF output with electrical and optical(TOSLINK) interface. We can use too 3 HID buttons for setting volume and mute. Circuit description Schematics is [...]

Download Complet project – ESR Meter Mk.2

Download complet project – Modulator UKF FM

Micro fm Bug Download in pdf format