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Posted on Friday, April 30, 2010 • Category: AVR
This board is a RDS coder using an ATMEL AVR ATmega32.
This board can be controled by a RS232 link, USB interface or SPI.
TA data is displayed wiyth a LED and can be controled by :
- Hardware input
- SPI (not yet implemented)
Posted on Friday, April 30, 2010 • Category: FM Transmitters
Filter used for eliminate unwanted harmonic frequency at second and third. Notch filter, Band Pass Filter (BPF), and High Pass Filter (HPF) sometime combined in constructing LPF design.
Schematic below for FM Broadcast Lowpass Filter 88-108 MHz. It has been tested with a good result.
Note : Make the coils at 74 nH and trim them to adjust exact value.
Posted on Thursday, April 29, 2010 • Category: USB Interface Adapters
Control up to three devices from a PC with FT232 IC (USB to Serial UART) from Future Technology Devices International FTDI. Circuit is simple and does not require external microcontroller or any type of firmware programming. PC control software written in VB6 is included.
Posted on Thursday, April 29, 2010 • Category: PIC
This is a digital thermometer based on USB PIC16C745 microcontroller from Microchip and DS1820 sensor from Dallas Semiconductor. Temperature readings are sent over USB port in HIDCOMM USB mode to VB6 program on a PC. Hex program and sample Visual Basic 6 application is included.
Posted on Thursday, April 29, 2010 • Category: FM Transmitters
In order to simplify the transmitter design, we've used the new pll circuit from Motorola :the MC145170.
This PLL includes the prescaler and a serial standard bus called SPI.
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