High Voltage Parallel Programmer AVR

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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

[Link]

Make pcb circuit using Laser printer and Iron

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Second only to the type of printer toner, the choice of paper is a very important consideration. You need to use a medium that will go through your printer and will preserve the printed image but won’t absorb the toner or bind it too tightly. For this, glossy paper is the answer. In this demonstration, we’ve used Kodak Ultima Picture Paper–specifically their “High Gloss” 71 lb (270g/m2)–as it works well and should be available throughout North America and possibly Europe. It is their picture paper with the heaviest weight and is said to be useful for “Professional quality photographs”. This also means that it’s expensive: $1 or more per sheet in small quantites. Rumour has it that you can use many different types of glossy paper, including pages from the Times magazine, but no one here has attempted this yet.

To save time, effort and expenses it’s a good idea to combine multiple images to try and fill the entire 8.5×11 page with PCBs. Remember that these must be printed as mirror images of the final PCB in order to be correct after transfering them to the copper board. On the left you can see an ordinary sheet of paper used during the trial run and (to its left) the glossy koday paper with the 9 PCBs. [link]

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