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Ni-Cd Charger
Posted on Friday, April 16, 2010   •   Category: Battery Chargers

Ni-Cd Charger

This is a NiCd/Ni-MH charger that can charge with constant current and automatic charge termination when the total voltage for all cells reach the setting voltage.




PIC12F675 PIN PONG
Posted on Friday, April 16, 2010   •   Category: PIC

PIC12F675 PIN PONG

This project is based on ideas from Rickard's electronic projects page and David B. Thomas VCR Pong. However, I have developed the simplicity even further, eliminating most of the external components. Using microcontrollers with internal 4MHz clock generator there is no need for the xtal. The 12f675 part also operates on wide voltage range, and the regulator can be removed. For game controller, I plan on using the old Commodore 64 style paddless. They include firing buttons, which I plan on using as power switch and game reset. 16F675 has a low power sleep mode with 1nA current consumption, so I plan on using that to switch off.




2 Channel RF AVR Remote Control
Posted on Thursday, April 15, 2010   •   Category: Remote Control

2 Channel RF AVR Remote Control

How many times you needed some remote control to handle some electric device ? many times. There are lot of remote controls like infrared, RF, SMS (like my other circuit) and more. The basic small-range remote controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is that the signal can not pass the walls. So, if you want to control your garage door, the only way is to use some RF remote control. The circuit (transmitter and receiver) use few components and ordinary (I love few component circuits) . Its easy to build it because you don't have to tune-up any coil or variable capacitor. The RF modules are fix to work in 418MHz area.




Li-Po Charger and Balancer
Posted on Thursday, April 15, 2010   •   Category: Battery Chargers

Li-Po Charger and Balancer

This is a Li-Po charger and balancer project for R/C hobby.The charger circuit is based on the circuit of Electron head and all folks in the DIY electronics topic on the rcgroups.com.




IR Proximity Sensor
Posted on Thursday, April 15, 2010   •   Category: Sensors

IR Proximity Sensor

It is the same principle in ALL Infra-Red proximity sensors. The basic idea is to send infra red light through IR-LEDs, which is then reflected by any object in front of the sensor. Then all you have to do is to pick-up the reflected IR light. For detecting the reflected IR light, we are going to use a very original technique: we are going to use another IR-LED, to detect the IR light that was emitted from another led of the exact same type! This is an electrical property of Light Emitting Diodes (LEDs) which is the fact that a led Produce a voltage difference across its leads when it is subjected to light. As if it was a photo-cell, but with much lower output current.




Li-ion Battery Charger
Posted on Thursday, April 15, 2010   •   Category: Battery Chargers

Li-ion Battery Charger

This is a simple to build charger for single 3.7V lipo battery. The heart of the charger is TL431 shunt regulator that controls the incoming current. Charger comes with a convenient charging LED indicator. As charging current goes down so does the intensity of the LED.




MP3 Player with SD Memory Card
Posted on Thursday, April 15, 2010   •   Category: AVR

MP3 Player with SD Memory Card

The MP3stick is a simple and small portable MP3 player. A microcontroller Atmel AVR ATmega128 is the heart of the circuit. MP3 decoding is done by an VLSI VS1011b decoder IC. A MMC/SD card works as memory medium for MP3 files, playlist files and skin files. The player is designed to draw his power from a LiIo/LiPo battery with 3.6V. a charger circuit, based on MAX1811, is included. All information will be shown on a Nokia color LCD with 128x128 pixel and 256 colors.




RC5 Infrared Remote Control Receiver for Media Centers
Posted on Tuesday, April 13, 2010   •   Category: Remote Control

RC5 Infrared Remote Control Receiver for Media Centers

RC5 Infrared Remote Control Receiver for Media Centers A few time ago I decided to create a media center box to replace my DVD player, satellite receiver, VCR and my kid's Play Station 2 , to one device. So, I made a core 2 duo processor system that actually replaced with succeed, all my electronic devices. The only thing that was missing was a remote control to switch On/Off my Media Center. After I searched on the net to buy a complete remote control system, I saw that the price was a little bit high (about 90 euros). I checked my stuff to find my old 7-in-one remote control that I had bought 2 years ago and I started to build my own remote control receiver circuit.




Universal RC5/RC6 Transceiver with PIC16F628
Posted on Tuesday, April 13, 2010   •   Category: Remote Control

Universal RC5/RC6 Transceiver with PIC16F628

This project is an expansion from another project from this website. On the one side you can read the RC5, RC5X and RC6 codes from remote controls on a LCD and on the other hand you can send all thinkable RC5, RC5X and RC6 codes to a device. Besides is for this project a PCB layout drew to make it still more easier for you.




LM386 Audio Amplifier
Posted on Tuesday, April 13, 2010   •   Category: Amplifiers

LM386 Audio Amplifier

This simple amplifier shows the LM386 in a high-gain configuration (A = 200). For a maximum gain of only 20, leave out the 10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be realized by adding a selected resistor in series with the same 10 uF capacitor. The 10k potentiometer will give the amplifier a variable gain from zero up to the maximum.




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