This programmer is a simple version of STK-200 ISP AVR programmer. I designed it using several schematics from the internet as a basis. It is not my design, I simply combined several designs and designed the pcb.
The programmer can be connected to computer with a lpt cable. It’s a very simple design and uses only one IC - the 74hc244 buffer. It’s used to convert different voltage levels between computer and the programmed AVR microcontroller.
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