Its not that micro will burn if you use 1N4148 diodes, but why to take risk !!. You can substitute Bat85 with 1n4148, however it is not recommended because, this diode will clamp +12V and -12V to +5.4V and -0.7V which are not desirable, as per datasheet of microcontroller. Serial port generates +- 12V on its pins, thus diodes and zener diode is used to clamp +12V to +5.0V(4.7V due to zener + 0.3V due to bat85) and -12V to -0.3V (due to lower Bat85). You can use PonyProg2000 software to program your AVR using this programmer. Main advantage of using serial port is you can have cable length upto 2m. Serial port programmer(reference: At-Prog) is shown here. Two types of AVR programmers can be built:ΔΆ)Serial port Serial Port based AVR ISP Programmer In this post we are going to see how to Make your own, ultra simple, and universal AVR programmer.
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