Easy-Downloader 2.2 is a 89C51/52/53 downloader, with a single-sided printed circuit board of 8.5x7cm. The green light indicates 5V, and the red light indicates 12/5V. The voltage +15V input (positive and negative poles can be ignored) enters the voltage regulator chip through the rectifier bridge. Programming requires very precise voltage. The correct voltage is +5V+/-0.1 when 2N2222 is turned on and +12V+/-0.5 when it is turned off. You can also use two sliding rheostats (5k, 2.5K) to replace R12V and R5V in the PCB respectively, so that the microprocessor can better control the power supply to achieve programming.
Keywords：C51
Reference address：Simple C51 Downloader
Figure 1: Easy-Downloader V2.2 circuit diagram
Figure 2: PCB file
(blue bottom layer, red top layer for jumpers, yellow silkscreen layer)
Figure 3: PCB bottom layer and holes
Figure 4: Black and white print bottom layer, top view
Figure 5: Finished product
Download: PCB diagram (Protel 2.7.1) easy52.pcb , AT89C51 BIN file
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