AVR has two different programming modes called Parallel Programming Mode (Parallel Mode) and Serial Downloading Mode (ISP mode).

At the Parallel Mode, the device to be programmed is put on the programmer’s socket and +12 volts programming voltage is required to its RESET pin. Communicating between the programmer and the device is done in parallel programming commands, so that the programing speed is two times faster than ISP mode. This programming mode is used to pre-program many devices or/and ISP mode cannot use due to the board design. However, most programmers except STK500 seem not to support this programming mode. Using High voltage parallel programmer can recovery wrong fuse bit setting.

Schematics Download :

1. Circuit Diagram for Parallel/HVS Programmer
2. Socket Converters for Parallel Programmer
3. Circuit Diagram for 8/14pin HVS Programmer

Software Download :

1. AVRPP.EXE(Win32) & Source

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usb battery Charger

usb Battery charger schematic

The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMHs in about 3.5 hours, and 2500mAh NiMHs in about 5.5 hours. The charger incorporates an automatic charge cut-off circuit based on cell temperature, and the cells can be left in the charger indefinitely after cut-off. Read the rest of this entry »

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This kit combines an LM317 with a thumbwheel potentiometer to allow you to easily set the output voltage from 1.5V up to 2V less than the input.

Features:

• Stable, low-noise output adjustable from 1.5 to 30V
• Supplies up to 500mA
• Preset outputs of 5V/9V/12V
• Integrated heatsink

dc power supply KIT - [Link]

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