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PIC18F2445 USB Experimental IO Board
Posted on Wednesday, April 28, 2010   •   Category: PIC

PIC18F2445 USB Experimental IO Board

Manji broj proizvođača proizvodi IC kola za USB podršku. Najpoznatiji su: Cypress Semiconductor, FTDI, Philips i drugi. Microchip je 2000 godine proizveo mikrokontrolere PIC16C745 i PIC16C675 koji su imali podršku za USB komunikaciju i tako se pridružio ostalim proizvođačima. Ovi mikrokontroleri podržavaju USB 1.1 standarad, odnosno USB sa brzinama rada do 1.5 MBs. Nova serija Microchip-ovih mikrokontrolera urađenja u flash tehnologiji PIC18F2445/2550/4455/4550 je podržala USB 2.0 standrad. Ovo su moćni mikrokontroleri sa brzinama takta i preko 40Mhz i veličinom programske memorije od 32K reči. O stanadardima za USB možete na sajtu http://www.usb.org. Upravo na ovim mikrokontrolerima urađen je interfejs sa USB komunikacijom.




USB Li-ion Battery Charger
Posted on Wednesday, April 28, 2010   •   Category: Battery Chargers

USB Li-ion Battery Charger

This is a charger for lithium ion batteries which takes its power from the USB port of a computer. It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip. Microchip MCP73861 or MCP73863 are advanced, fully-integrated, single-cell Li-Ion/Li-Polymer charge-management devices allow these peripherals to utilize the full power of the USB port.




Solar Battery Charging
Posted on Wednesday, April 28, 2010   •   Category: Battery Chargers

Solar Battery Charging

This instructable will show you how to make your own solar battery charger from very simple components. It is taken from my documentation provided with a kit I supply - you should easily be able to source the same components yourself of course.




15V / 28V 4A Transmitter Power Supply
Posted on Wednesday, April 28, 2010   •   Category: Power Supplies

15V / 28V 4A Transmitter Power Supply

Power supply used for professional FM broadcasting transmitter.




LM3876 GainClone Amplifier
Posted on Tuesday, April 27, 2010   •   Category: Amplifiers

LM3876 GainClone Amplifier

The amp is based on the Project 19 PCB, so uses a pair of LM3876 (or LM3886) power opamps, run from a ±35V supply. I used a cut-down P88 preamp PCB because I only wanted one preamplifier stage, but the entire board can also be used. Alternatively, the P19 amp can be run at higher gain than normal, alleviating the need for a preamp at all. The down side of this is that the noise level will be higher, and background noise may be audible with efficient speakers and/ or very quiet surroundings.




Atmel Solar Panel Battery Charger
Posted on Tuesday, April 27, 2010   •   Category: Battery Chargers

Atmel Solar Panel Battery Charger

Batwatch is a simple monitor for a solar panel battery charger, using an Atmel ATtiny13V. It periodically measures the charge current and battery voltage, and shows them by blinking two LEDs. I built this circuit into the plug of a VW solar charger panel that is used to prevent a discharge of the battery when a car is not used for some time. A modern car contains a large amount of electronics, and a quiescent current of 40-50mA (about 1Ah per day!) is considered "normal".




Basic PIC18F4550 USB Communication Interface
Posted on Tuesday, April 27, 2010   •   Category: PIC

Basic PIC18F4550 USB Communication Interface

When the device is connected to the computer, a Virtual COM Port (VCP) will be created. This is shown at the Device Manager Window under Ports(COM & LPT). In this case, COM5 was created when the PIC18F4550 was attached to the USB Port. It may be interesting to note that if you plug in your PIC in different USB ports, the VCP created will be different.




AVR ATMega8 PLL Module with MC145170
Posted on Tuesday, April 27, 2010   •   Category: AVR

AVR ATMega8 PLL Module with MC145170

This is the transmitter PLL module with ATMega8, MC145170 and 16x4 LCD Display.




Basic USB-RS232 Communication with PIC Microcontrollers
Posted on Tuesday, April 27, 2010   •   Category: PIC

Basic USB-RS232 Communication with PIC Microcontrollers

The quickest way to display something is probably sending the data to the computer to be displayed on the monitor. One of the ways to do this is to use the USART module on board the PIC Microcontroller by making use of the pins RC6 and RC7 which is also the TX and RX pins respectively when the SPEN bit on the RCSTA register is set.




MC145151 PLL FM Transmitter
Posted on Friday, April 23, 2010   •   Category: FM Transmitters

MC145151 PLL FM Transmitter

This PLL has been designed with an old Motorola circuit :the MC145151. The VCO is based on a "Colpitz" oscillator equiped with a Fet Transistor.(J310) Two varicap Diodes are used in order to reduce the global noise of the VCO. In addition,these two diodes allow the PLL to keep the lock status through a large range of climatic conditions. An another J310 is used in order to match the impedance between the oscillator and the fist amplifier stage. A MSA1105 from Minicircuits increases the RF power level coming from the VCO to +14dBm. A simple low pass filter rejects the second harmonic to -20 dB.(Worst case) Finally, a 7 dB attenuator and a second amplifier stage (BFR96S) achieve this radio design.




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